BUILDING BETTER FLOORS · meyjoist - BuiLding Better FLoors meyJOISt is an engineered timber...
Transcript of BUILDING BETTER FLOORS · meyjoist - BuiLding Better FLoors meyJOISt is an engineered timber...
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engineeredi-joists
P R O D U C T M A N U A LU p dat e d M ay 2020
BUILDING BETTER FLOORS
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SEE IMPORTANT NOTICE AND WARNING ON PAGE 17
meyjoist rAnge
tABLe oF Contents
meyjoist - BuiLding Better FLoorsmeyJOISt is an engineered timber I-Joist supplied by Meyer timber® primarily used for floor and roof applications. available in long lengths, they are lightweight, easy to install and have generous web hole allowances for wiring, plumbing, and air conditioning ducting. this product manual contains all the information needed to specify and install a complete solution using meyJOISt. a separate meyJOISt Installation Reference Sheet is also available and includes common details and installation requirements in a handy double sided flyer.
QUALITy & PERFORMANCE• Technicalsupport–experiencedengineeringsupport, simply call your local Meyer timber® office.• ‘Offtheshelf’convenience–readilyavailable,exstock via a building merchant, simply cut to length and install.• Termite protected – meyJOIST incorporates H2-S termite protection across the range for areas of australia south of the tropic of Capricorn.
meyJOISt range & sizes 2
meyJOISt spans 3
typical floor layout 4
meyJOISt specification/installation 5
Supports 6
Intermittentblocking 7
Temporarytopflangerestraint 7
application of construction loads 8
meyJOISt support using hangers 9
meyJOISt set-downs for wet areas 10
NotchingandCutbackswithmeyJOIST 10
Web holes for meyJOISt 11
IHSmeyJOISTholesupport 13
Cantilevers for Balconies 14
Joists supporting parallel loadbearing walls 15
Method for framing cantilevers supporting 16 loadbearing walls
Lateral stability 16
Tiedowns 17
Productfaultsanddisclaimer 17
detail F1 - F22 18 - 22
meyJOISt for use as rafters 23
DetailR7-R26 24-26
Fireandacoustics 27
Software for floor design / meypLaN 28
Table 1: Dimension and Shape Figure 1: meyJOIST Sizes
MJ200 45 200 45 2.7MJ240 45 240 45 2.9
MJ240 63 240 63 3.7
MJ240 90 240 90 4.9
MJ255 63 255 63 3.8MJ300 45 300 45 3.3MJ300 63 300 63 4.0MJ300 90 300 90 5.2MJ360 63 360 63 4.4MJ360 90 360 90 5.6MJ400 90 400 90 5.8
Overall depth(mm)
meyJOIStSection Code
Flange Width (mm)
Mass (kg/m)
Spring: 1/1000Moisture content: 8-15%Depth: -0, +2mmWidth: -0, +3mm
Low Profile meyJOIST
Economy meyJOIST depth
Wet area set-down for MJ300
Most common meyJOIST depth
For larger span capabilities
Longest spanning meyJOIST
Flange Width 45mm 63mm 90mm
Jois
t dep
th
400m
m36
0mm
300m
m25
5mm
240m
m20
0mm
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meyjoist sPAns
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Information contained in this publication applies for floor joists used in residential applications. For more information refer to designIt® (or other) software. Use of software will provide a wider range of options and allow more optimum design.
DESIGN CRITERIA & LOADINGThe values given in these figures have been developed by experienced timber design engineers in accordance with AS1720.3:2016.ForotherdesigngeometryandloadingconditionsincludingallowablecantileversthefreedesignIT®(orother) software should be used for specification.
FLOOR RIGIDITyIntheselectionoffloorjoistsizesforagivenspan,specifiersshouldusetheabovemaximumjoistspansforguidanceandinadditiontakeintoaccounttheintendedoccupancyoruseofthefloor.Floorssupportingpartitionwalls,thoseconstructedusing more rigid flooring or including ceiling battens will have improved dynamic performance. these factors may also be takenintoconsiderationinselectionoffloorjoistsize.
Figure 2: meyJOIST Maximum Span Recommendations
Notes:1. Spans refer to ceiling attached to underside of meyJOISt, for ceiling not attached refer designIt® (or other) software.2.Continuousspanvaluesabovearebasedonamax15%variationorspancombinationtogive12mmaximumlength.3.Spansbasedon35mmendbearingand70mmintermediatebearinglengths.4. Spans for apartment floors do not apply to communal areas or corridors. Refer to software or contact Meyer timber® for more information
DOMESTICFLOORS
Joist Spacing450mm
Live Load: 1.5kPa/1.8kN
DOMESTICFLOORS
Joist Spacing 600mm
Live Load: 1.5kPa/1.8kN
APARTMENTFLOORS
Joist Spacing 450mm
Live Load: 2kPa/1.8kN
meyJOISTSection Code
meyJOISTSection Code
meyJOISTSection Code
SPAN (M)
SPAN (M)
SPAN (M)
Dead Load: 40kg/m2 (Normal Areas)
Dead Load: 40kg/m2 (Normal Areas)
Dead Load: 80kg/m2 (Normal Areas)
Dead Load: 100kg/m2 (Heavy Areas)
Dead Load: 100kg/m2 (Heavy Areas)
Dead Load: 150kg/m2 (Heavy Areas)
3.0 4.0 5.0 6.0 7.0 3.0 4.0 5.0 6.0 7.0
3.0 4.0 5.0 6.0 7.0 3.0 4.0 5.0 6.0 7.0
3.0 4.0 5.0 6.0 7.0 3.0 4.0 5.0 6.0 7.0
SINGLe SpaN
CONtINUOUS SpaN
MJ200 45MJ240 45MJ240 63MJ240 90MJ255 63MJ300 45MJ300 63MJ300 90MJ360 63MJ360 90MJ400 90
MJ200 45MJ240 45MJ240 63MJ240 90MJ255 63MJ300 45MJ300 63MJ300 90MJ360 63MJ360 90MJ400 90
MJ240 45MJ240 63MJ240 90MJ255 63MJ300 45MJ300 63MJ300 90MJ360 63MJ360 90MJ400 90
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BrACkets: Fixing: FLooring:
haveagapbetweenjoistandbottomofbracket.A6gx30mmlongwaferheadscrewisrecommendedfrom underneath to pull joist down.
keep1-2mmgap at end.
secure joists to lower frames or sub-floor adequately to prevent movement.
use correct fasteners (consult flooring documentation).Screwsorringshanknails are highly recommended.
- apply adhesive in accordance with adhesive manufacturers recommendations.- Install flooring before adhesive formsaskin.-Completemechanicalfixingofthe sheetwithintheworkingtimeof the adhesive.- Follow the flooring manufacturers recommendations relating to gluing of sheet grooves.
fixinternal and external walls above to joists adequately to prevent movement.
skewnailjoiststobeams/ packersbeforeinstallingbrackets.
use adhesive sparingly or allow it to form askinpriortoflooringsheetinstallation. miss joists with fasteners so they
rub against the side of the joist.
HOW TO MINIMISE THE POTENTIAL SQUEAkS IN FLOOR SySTEMS
A handy 2-page meyjoist installation reference sheet is also available and can be supplied as a
hard copy to site upon request.
Connection to steelbeams (detail F4, page 18)
BracketsformeyJOIST(page 9)
Cantilevers for Balconies (page 14)
temporary restraint (page7)
meyJOISt web holes for services (page 11)
Cantilevers supporting loadbearing walls (page 16)
LateralRestraint(page7)and transfer of Bracing
Forces (page 16)
Bearing at supports(page 6)
tYPiCAL FLoor LAYout
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SQUeaKy FLOORSBROCHURE
INStaLLatIONREFERENCESHEET
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meyjoist sPeCiFiCAtion / instALLAtion (General Requirements)
there are some aspects of both specification and installation that can be regarded by designers and builders as basic requirements. these should be adopted for installation in the absence of other or additional requirements that may be specified in the design documentation. Requirements that fit into this category are defined and detailed in this section called ‘General Requirements’.
Other aspects are categorised as ‘Installation details requiring design and specification’(pages14-17)becausetheyneedselectionand individual specification in the design documentation to ensure the design intent is communicated to the builder.
this product manual provides a variety of details specific to the use of meyJOISt floor systems for houses and similar buildings. details contained in this publication have been appropriately engineer designed and/or tested to determine their suitability. In addition, many details in aS1684 and other industry publications are equally applicable to meyJOISt as for conventionaltimberjoistedfloors–usethem.Wedohowever,cautionagainstanyassumptionthatdetailspublishedforother I-Joist products are suitable or sufficiently complete for use with meyJOISt.
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STORAGEPriortoinstallation,meyJOISTshouldbestackedonlevel bearers,atleast150mmclearofthegroundandkeptdry.
JOIST LAyOUTIn all cases it is assumed that installation will be carried out in accordance with a joist layout drawing showing the location, size(sectioncode)andmaximumspacingsofjoiststogetherwithreferencetoanyspecialrequirementsnotincludedinthisguide as ‘general requirements’.
JOIST PLACEMENTJoistsshouldbeaccuratelyplacedatnotmorethanthenominatedmaximumcentretocentrespacingsoastoprovidethesupport required for flooring and load bearing walls or posts. Joist placement must be so as to clear any obstructions that mayoccurthroughthefloorsuchasplumbing,drainagepipesorairconditioningductwork.
FIxING TO SUPPORTSJoistsaretobefixedaccuratelyinpositionatsupportsusingnailsorscrewsasperDetailF5.Nailthroughflangesusingaminimumof2/3.06Øx75mmlongnailsat least40mmfromtheendofthejoist.Screwsupto14g(6.3mm)x75mmlongcanalsobeusedforfixingtosupports.Whenusingscrewsitisstronglyrecommendedtopre-drilltheholewithadrillbitequivalenttothesizeofthescrewshanktopreventsplitting.Seealso‘Supports’sectioninthismanualforfurtherinformation.
FIxING OF SHEET FLOORINGItisrecommendedthatsheetflooringbesecuredtojoistsusingself-drillingType17screwsorring/twistshanknails.Nailsshould be 2.8mm diameter nails, hand driven or 2.5mm diameter nails, machine driven. Nail or screw spacing should be at centres recommended for the particular flooring type. Where nail centres are less than 50mm it is good practice to stagger their location so as to avoid the possibility of splitting. Flooring adhesive must used in conjunction with fasteners to minimize anychanceoflongtermfloorsqueak.
Table 2: Fixing of Sheet Flooring (Particleboard, OS’Floor, Plywood etc.)
Flooring Thickness: 15 - 22mm 25mmRecommended Nail/Screw Lengths: 50mm 65mmSimpson Strong-Tie® Quik Drive Screw Code: WSV50SA (10gx50) WSNTL212SA Complies to AS1860.2
HB Fuller Flooring Adhesiveswww.hbfuller.com.au
Strong Drive™ SUBFLOOR ScrewRibbed flat head, twin lead thread, sharp point.Yellowzinc.#3squaredriveorT25Torxdrive.8g x 32mm (WSC114SA)10g x 50mm (WSV50SA)8g x 65mm (WSNTL212SA)8g x 75mm (WSV3S)
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suPPortsSupports shall be level, dry and have at least the rigidity implied by good framing practice and/or the design criteria specified for supporting components in aS1684. (a moisture barrier is recommended where support is directly to masonry orbrickwork).BracketsavailableforusewithmeyJOISTarelistedin table 4.
JOIST INSTALLATION TOLERANCESFigure 3: Install Joists Plumb
Figure 5: Blocking and Bearing at Supports
Table 3: Blocking and Bearing at Supports
Figure 4: Install Joists Straight
BLOCkING & BEARING AT SUPPORTS (FOR GRAVITy LOADS)
SUPPORT ON FULL meyJOIST FLANGE WIDTH.USE FULL SUPPORT WIDTH WHERE POSSIBLE.
Required Bearing (mm)End Supports
Sheet Roof
Tile Roof
Sheet or Tile Roof
≤ 450mm Joist Spacing 600mm Joist Spacing 600mm Joist Spacing≤ 450mm Joist SpacingIntermediate Supports (continuous spans)Load at Supports
Floor Loads Only
Concentrated loads from jamb studs or posts
Floor loads plus compression load from a two storey load bearing wall
supporting roof and upper floor
Floor loads pluscompression load from a
single storey load bearing wall supporting roof only
*Orprovidebearingasforjoistssupportingfloorloadsonlyandinstallcontinuousblocking,‘rimboard’orboundaryjoisttosupportroofandwallloads
Inadditiontotheabove,installcompressionblocksasperDetailF18
InstallcontinuousmeyJOISTblocking
InstallcontinuousmeyJOISTblockingInstallintermittentblockingorequivalent*-See Figure 6
Installintermittentblockingorequivalent-See Figure 6≥ 30mm ≥ 30mm ≥ 45mm
≥ 45mm≥ 45mm*
≥70mm*
≥70mm*
≥ 90mm*
≥70mm
≥70mm
≥70mm ≥70mm≥70mm ≥70mm
Maximum1mmper 300mm joist depth
FloorLoadsOnly
endSupport
endSupport
endSupport
endSupport
FloorLoadsOnly
IntermediateSupport
IntermediateSupport
FloorLoadsOnly
≥ 30mm ≥ 30mmeach joist
45-70mm
ContinuousBlocking
Floor + Single Storey Walland Roof Loads
Floor + Single Storey Walland Roof Loads
IntermittentBlocking
45-70mm 45-90mm
Straight to within 1mmper metre of span
See Table 3 for bearing requirement based on loading/spacing as well as double storey and concentrated load supports.
• Bearingshouldbeprovidedtothefullwidthofthe meyJOISt bottom flange.• It is good practice to bear over the maximum available width of supports.• Use of web stiffeners can reduce the required bearing however this needs to be specified in the design documentation.• Continuous blocking provides support for load bearing walls directly aligned above supports. at end supports,‘rimboard’orboundaryjoistscanbeused asanalternativetocontinuousblockingtosupporta load bearing wall.• designIT® (or other) software may give reduced bearing requirements for specific cases.
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the fundamental requirement is to install joists plumb and hold them upright at supports.Thesimplestandmosteffectivewayofachievingthisistoinstallsquare cut meyJOIST blocking but alternative methods suchas the use of ‘rimboard’, boundary joists, metal strap/brace orplywood closures are acceptable. Installation of these is shown inDetailsF1,F2,F3andF17.
Note:Intermediateblocking(midspan)isnotrequiredandcanbeasourceofannoyingnailcreaksinthefinishedstructure.
Forbestperformance,thetopflangeofmeyJOISTshouldbeheldstraightbetweensupports–(nomorethan1mmpermetreof span deviation from straight).
Beforeloadingjoistsandattachmentofflooring:• Installblocking(orequivalent)atsupportsasdescribedabove,andbetweensupports,installtemporarybattensbraced backtoapointofrigidity(nomorethan2.5metresapart)toholdthetopflangeofeachjoiststraightbetweensupports.• Forinstallationofflooring,progressivelyworkacrossthefloorremovingbattensasrequired.
Ifthereisnoflooringorwallplatetorestrainthetopflangepermanentlyatsupportpointstheneithercontinuousblocking,rimboardorboundaryjoistsarerequired,orapermanentbattenfixedtothetopofthejoistswith2/3.06Øframingnailsatevery joist.
Figure 6: Intermittent Blocking (or Equivalent) at Supports
Figure 7: Temporary top flange restraint
Maximum1800mm*Nail wall plates or flooring to each joistandtoeachblockingpieceFlooring
temporary BattenBlocking(orequivalent)
at supports
Bracketsaresuitableforproviding restraint
2.5mm
aximum
2.5mm
aximum
Wall plate or
temporary Batten
Blockingatintervalsnotexceeding1800mm* along the line of support
Blockingorequivalenttojoistsat or near the edges of the floor
*Blocking in pairs at 3600mm maximum spacing is equally acceptable
interMittent BLoCking (or equivalent)
teMPorArY toP FLAnge restrAint
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MATERIAL STACkED OVER LOADBEARING WALLS UNDER:-Supportstohaveblockinginstalledover.- Loadbearing walls to be perpendicular to joists.- Material to be perpendicular to joists.- Material to be located centrally over support wall.-Quantityaspermaterialguidancex2.5.
MATERIAL GUIDANCE:Maximumstackedmaterials:- 15 sheets of 19mm particleboard flooring.-18sheetsof18mmOS’FLOOR.-27sheetsof10mmplasterboardlining.-Othermaterialsuptoamassof200kg/m2
MATERIAL PERPENDICULAR TO meyJOIST AWAy FROM SUPPORTS
MATERIAL PARALLEL TO meyJOIST AWAy FROM SUPPORTS
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APPLiCAtion oF ConstruCtion LoAds
meyJOISt floor systems will be required to support short term loads during construction for items such as materials (sheet flooring, plasterboard, tiles, etc.) or tools. Once the joists have been erected in accordance with the meyJOISt installation referencesheetorthismanual,lateralrestraintblockinghasbeeninstalled,andfloorsheetingortemporarybattensareinplace, short term loads can be applied. the best location to place heavy items of material is directly over internal loadbearing walls underneath. Where this is not possible, construction loads can be located as shown in Figure 8 below.
WARNING: Lateral Restraint blocking and Floor sheeting (or temporary battens)MUST be installed before applying any construction loads.
Support wall
Support wall
Support wall
Support wall
Figure 8: Application of Construction Loads
temporary battensor floor sheetinginstalled
temporary battensor floor sheetinginstalled
Parallelstackedmaterialrequirements:- Loaded on bearers spaced at 600crsmaximum.- Bearers to span minimum 4 joists.- Bearers to be temporarily secured to all joists.- Quantity as per material guidance below.-Nomaterialtobestackedon joists supported by hangers.
Perpendicularstackedmaterialrequirements:- Material to span minimum 2 joists.- Quantity as per material guidance below.-Nomaterialtobestackedonjoists supported by hangers.
Blocking(or equivalent)at supports
Blocking(or equivalent)at supports
CONStRUCtION LOadFACTSHEET
pReFaB It CaSSetteFLOORBROCHURE
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BracketCode
BracketCode
JD4 DESIGN CAPACITy Nd,j (kN)
JD4 DESIGN CAPACITy Nd,j (kN)
NaILS
NaILS
NaILS
SCReWS
SCReWS
FixingtoBearer
Floor live load case
Floor live load caseFixingtoBearer
All IJT Hangers 6 6.1
MH5090 8 4 5.7 6.1 MH50120 14 6 9.9 9.1 MH50140 16 8 11.3 12.1 MH50180 22 10 15.0 15.0 MH50220 26 12 15.0 15.0 MH70135 16 8 11.3 12.1 MH70235 28 12 15.0 15.0
meyJOISTSection
Code
Top Mount Hanger Code7
Face Mount Hangers
Numberof Nails toBearer1,2,3
Full Depth Hanger Code4
Partial Depth Hanger Code4,5
MJ200 45 8 IJF20050 MH50140 IJT20050 MJ240 45 10 IJF24050 MH50180 IJT24050 MJ240 63 10 IJF24065 MH70235 IJT24065 MJ240 90 10 IJF24090 FB90200* IJt24090 MJ255 63 10 IJF24065 MH70235 N/A MJ300 45 12 IJF30050 MH50220 IJT30050 MJ300 63 12 IJF30065 MH70235 IJT30065 MJ300 90 12 IJF30090 FB90200* IJt30090 MJ360 63 16 IJF36065 MH70235 IJT36065 MJ360 90 16 IJF36090 FB90200* IJt36090 MJ400 90 N/a N/a FB90200* Lt400/90*
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meyjoist suPPort using HAngers
Table 4: Joist Hangers for meyJOIST
Notes:1.NailingspecifiedisforbracketsfacefixedtoJD4(orbetter)timberbearerorwalingplate.2.Bracketstobeinstalledstrictlyinaccordancewithbracketmanufacturers’recommendations.3.NailsforMH,IJF,andIJTserieshangerstobe3.75Øx35mmlongflatheadnails.4.12gx35mmlongType17HexheadscrewsaresuitabletobeusedforIJFseriesbrackets.Use50%ortherequirednails(4minimum)todevelopequivalenthangercapacities. SeeTable7forMHseriesbrackets.5.Partialdepthfacemounthangerstobeinstalledwithwebpacking-installasforwebstiffenersreferDetailF6.6.NailingspecificationappliesforjoistsusedinhousessupportingflooronlywithfloorDeadLoadnotexceeding100kg/m2.7.Topmounthangerspanlimitedto6.6m(40kg/m2)or5.4m(100kg/m2)atmaximum600ccspacingsupportingfloorloadsonly.8.Bracketsmarkedwith*areavailablefromPryda.
HangerCapacitytablenotes:1.Table4notesaboveapplyforTable5,Table6,andTable7.2.DesignCapacityValuesarefor1.2G+1.5Qloadcase(k1=0.69).3. Refer Meyer timber® for other load cases and joint groups.
Figure 9: Joist Hangers
Table 5: Face Mount I-Joist Hanger Capacities
Figure 10: Angle Bracket for Oblique Joists
Table 6: Top Mount I-Joist Hanger Capacities
Table7: Partial Depth Joist Hanger Capacities
Face mount (IJF) JoistHanger
top mount (IJt)JoistHanger
PartialHeightJoistHanger Fixthroughbracket
into bottom flange
Fixtopflangeto beam
Meyer timber®AngleBracket
BracketCode
JD4 DESIGN CAPACITy Nd,j (kN)NaILS
FixingtoBearer
Floor live load case
IJF20050 8 5.7 IJF24050 10 7.1 IJF24065 10 7.1 IJF24090 10 7.1 IJF30050 12 8.5 IJF30065 12 8.5 IJF30090 12 8.5 IJF36065 16 11.3 IJF36090 16 11.3
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meyjoist set-downs For wet AreAs
notCHing And Cut BACks witH meyjoist
meyJOISt section sizes can be used to create set-down areas and allow for fall in the finished surface to prevent ponding within the building envelope. this is most common in regions such as bathrooms.
the MJ255 63 has been specifically designed to compliment the 300mm deep meyJOISt range for this purpose. the set-down area rarely occurs over the full length between supports so those sections utilizing the set-down joist which are outside thewetareaneedtoberaised.TheMJ25563allowsforastandard45mmpackertobeusedtoachievethis.
Meyer timber® has the production capability to detail and manufacture these set-down joists. By chemically bonding the packerasrequiredtotheset-downjoistinthefactorytherewillbelittlechanceoffuturesqueaksorseparation.Alternatively,thepacking canbe supplied loose and installedon site. Caremustbe taken toensure that sufficient adhesive isusedbetween thepackerandset-down joist topreventanychanceof squeaks. It isalso recommended that longerflooringfastenersareusedforsiteinstalledpackerstoensurepenetrationthroughthepackerintotheset-downjoist.Alternativelythepackershouldbescrewedtotheset-downjoist.
Flanges may not be notched, planed or bored exceptasnotedbelow:
1. at end supports only, one or both flanges maybenotchedtoamaximumdepthof 12mm(perflange)asshowninDetailF7.
2. at end supports flanges may be chamfer cut but not beyond the line of the support.
3. Donotboreholesthroughflanges.Holes up to 6mm for installation of nails or screws at supports are allowed.
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Table 8: Set-down Joists Figure 11: Set-down for 300mm Floor Depth
200mm N/a N/a240mm 200mm 40 (ripped)300mm 255mm 45 (standard)360mm 300mm 60 (ripped)400mm 360mm 40 (ripped)
meyJOISt Set-down depth
meyJOIStFloor depth
PackerThickness(mm)
70x45Packer
33x45Packer
Set DownArea
MJ300 45
MJ300 45
MJ255 63MJ255 63MJ255 63
Figure 12: Flange notching
Figure 13: Notching/Cut Backs/Holes with meyJOIST
DO NOT OVERCUT
Flange notching to occur at end supports only
≤ 12mm
≤ 12mm
≤ 12mm
≤ 12mm
≤ 12mm
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weB HoLes For meyjoistHolesmaybecutthroughthewebofmeyJOISTprovidedtheyarelocatedwithinthecentralpartofthespanasspecifiedusing Figure 14, in conjunction with tables 9, 10 and 11. the tables specify allowable hole locations for some sizes of circular and rectangular holes. these limitations should be assumed to apply in the absence of alternative specification in the design documentation.
For particular load and support conditions or other hole sizes and shapes, alternative allowable hole positions may be specified using the designIt® or other software.
Figure 14: Circular and Rectangular Holes
Table 9: Circular Holes at 450mm Joist Spacing
Notes:1.Tableappliesforfloorjoistssupportingfloorloadsonlynotexceeding100kg/m2deadloadand1.5kPa/1.8kNliveload.2. “Intermediate” refers to internal supports of continuous span joists. all other cases shall be treated as “end” supports.3.Holelocationsclosertosupportsmaybepossibleforsomeloadandsupportconditions;refertodesignIT®(orother)software.4. General hole information to be adhered to as detailed in Figure 14 of meyJOISt product Manual.5. Values not applicable for joists supporting large concentrated loads - refer designIt® (or other) software.
No holes over 40mmin red zones
endsupport
endsupport
300
yX
y
D L H
X
300 300300 300Min
Larger of2d or 2L Intermediate
Support
Cantilever
Maximum40mmholein cantilever span
40mm holes allowed incentre of web with 100mmbetween holes
25mm holes allowedanywhere in web with50mm between holes
NO MORE THAN 3 HOLES ABOVE 75mm IN ANy ONE SPAN
meyJOISTSection
Code
MJ200 45 122
177
282
5.8
322
5.9
6.46.7
162
222
MJ240 45
MJ240 63
MJ240 90
MJ255 63
MJ300 63
MJ300 90
MJ360 63
MJ360 90MJ400 90
MJ300 45 4.9
5.3
Span(m)
MaximumHole
Diameter(mm)
Span(m)
Min. Distance ‘X’ from End Supports (mm)Hole Diameter (mm) Hole Diameter (mm)
Min. Distance ‘Y’ from Intermediate Supports (mm)
80 80110 110125 125150 150
3.03.6
3.6
4.0
4.3
3.6
4.2
4.7
3.5
4.0
5.0
4.0
4.5
4.9
300
300 N/S N/S
300
300
300
500
700
300
700800900
700
900
1100
700
900
1200
300300600
1000 1300
300 300
600
400 800
300 600
500 900
900 1300
500 900
800 1200
1200 1600
300
300
450
600 900
12001450
1700
1500
170020001700
1950
2300
850
1200
1700
300
500
300
650
300
600
900
3.5
4.1
4.0
4.5
4.9
4.5
5.0
5.6
5.0
5.5
6.1
4.5
5.0
5.8
5.5
5.9
5.5
6.3
5.5
6.0
6.7
6.8
7.3
7.7
Holeslargerthan32mmdiameteraretobecentredwherepossiblewiththeholeedgeaminimumof3mmawayfromtheflange.
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meyJOISTSection
Code
MJ200 45 122
177
5.4
322
282
300
300
300
6.0
5.5
6.3
300
700
162
222
MJ240 45
MJ240 63
MJ240 90
MJ255 63
MJ300 63
MJ300 90
MJ360 63
MJ360 90
MJ400 90
MJ300 45 4.6
4.9
Span(m)
MaximumHole
Diameter(mm)
Span(m)
Min. Distance ‘X’ from End Supports (mm)Hole Diameter (mm) Hole Diameter (mm)
Min. Distance ‘Y’ from Intermediate Supports (mm)
80 80110 110125 125150 150
3.0
3.3
3.3
3.6
3.9
3.6
4.0
4.3
4.0
4.4
4.7
3.5
4.0
4.5
300
300
N/S N/S
300
300
300
300
300300
300300
600
700
300600
300
500
800
300
300
300
700 800 1000
300
300 900
1000
500 1100
300
300 1000
600 1200
400 700 1300
300
650
400 700 1250
300
700
300 500 1000
600 900 1450
300 900 800 1400
1100 1700
500 1200
1100 1700
1600 2100
800 1400
1400 1950
1900 2400
700
800 1300
1400 1900
300
600
300
300
600
300
500
900
300
400
900
1300
300
450
800
300
800
1300
500
1100
1600
300
500
1100
3.0
3.9
3.0
4.0
4.6
3.5
4.5
5.2
4.0
5.0
5.7
3.5
4.5
5.4
4.5
5.0
4.0
5.0
5.9
4.0
5.0
5.5
6.3
5.4
6.5
6.1
6.9
7.2
3.54.04.54.94.04.85.34.55.05.55.85.05.55.95.06.06.46.06.7
4.55.05.55.95.05.56.35.05.56.06.75.56.06.85.56.57.36.57.7
3.03.54.04.64.04.54.94.04.55.05.44.55.05.55.05.56.06.06.3
3.04.04.55.04.05.05.94.05.05.56.35.05.56.55.06.06.96.07.2
8001200145017001200145023501200145018002100500750950300450750
300
5001000500750950500750
10001200
300
600
300950
12501600950
16002200950
1600190023507009501700300950
1350550900
300
400550300500700450600850
1000
Table 10: Circular Holes at 600mm Joist Spacing
Table 11: Rectangular Holes (200mm high x 300mm long or smaller)
Notes:1. table applies for floor joists supporting floor loads only not exceeding100kg/m2 dead load and 1.5kPa/1.8kNliveload.2. “Intermediate” refers to internal supports of continuous span joists. all other cases shall be treated as “end” supports.3.Holelocationsclosertosupportsmay be possible for some load and support conditions;refertodesignIT®(orother) software.4. General hole information to be adhered to as detailed in Figure 14 of meyJOISt product Manual.5. Values not applicable for joists supporting large concentrated loads - refer designIt® (or other) software.6.Maximumholeheights: MJ300 = 222mm MJ360 = 282mm MJ400 = 322mm
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Joist Spacing 450mm Joist Spacing 600mmmeyJOIST
SectionCode
Span (m) Span (m)Span (m) Span (m)Distance x (mm) Distance x (mm)Distance y (mm) Distance y (mm)
Min. Distance ‘Y’ from Intermediate Supports (mm)
Min. Distance ‘Y’ from Intermediate Supports (mm)
Min. Distance ‘X’ from End Supports (mm)
Min. Distance ‘X’ from End Supports (mm)
MJ300 45
MJ300 90
MJ300 63
MJ360 63
MJ360 90
MJ400 90
Notes:1.Tableappliesforfloorjoistssupportingfloorloadsonlynotexceeding100kg/m2deadloadand1.5kPa/1.8kNliveload.2. “Intermediate” refers to internal supports of continuous span joists. all other cases shall be treated as “end” supports.3.Holelocationsclosertosupportsmaybepossibleforsomeloadandsupportconditions;refertodesignIT®(orother)software.4. General hole information to be adhered to as detailed in Figure 14 of meyJOISt product Manual.5. Values not applicable for joists supporting large concentrated loads - refer designIt® (or other) software.
Page 13
iHs - meyjoist HoLe suPPortWhere holes are required to be located in areas not normally permitted using the standard tables, meyJOISt members can potentiallybestrengthenedusingIHSholesupportbrackets:
• ForusewithMJ240andMJ300seriesmeyJOIST.• Suitablewheretheedgeofaholeisonly50mmfromthefaceofthesupport(orasnotedinTable12).• Suppliedinasetof2tobeusedonbothsidesofasinglejoistorasinglesideoftwojoists.
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Table12showsallowabledistancesfromsupportsforIHSbracketsusedindomestichouses.ContactMeyerTimber®foranyvariations to loading, spans or distances not shown.
Table 12: Minimum Allowable Distances (mm) for IHS Reinforced Holes
Notes:1. “Intermediate” refers to internal supports of continuous span joists. all other cases shall be treated as “end” supports.2.ValuesinbracketsrefertodoubleIHSconfiguration.OthervaluesrefertosingleIHSconfiguration.3.100kg/m2valuestobeusedunderwetareas.40kg/m2 values to be used in other cases.4.Theabovevaluesarebasedonthemaximumspanthateachjoistcansupportwithmaximumholesizeasnoted.5. allowable distance is measured from inside of support to edge of hole.6. Values not applicable for joists supporting large concentrated loads - refer designIt® (or other) software.7.Alldimensionsinmm.
INSTALLATION• EachIHSconsistsof2setsofinterlockingplateswhichcanbeusedonasinglesideoronbothsidesofameyJOISTmember.• Theouteredgeoftheholemustbeatleast50mm(orasnotedintheTableabove)fromtheinsidefaceofthesupport.• HolescanbecutintothemeyJOISTwebbeforeorafterinstallationoftheIHS.• HolesmustfitwithintheinternalapertureoftheIHS(maximumholelength250mm).• OpenorclosetheIHStotherequiredwidth,ensuringthatthetwosectionsoverlapbyatleastonerowofnails (minimum overlap of 45mm).• PlacetheIHSontothemeyJOISTsothatthetopandbottomslidingflangesarealignedverticallycentralontothetop and bottom flanges of the meyJOISt.• IHStabsshouldbefacingoutwards.• Install3.75Øx35mmlongmeyJOISTconnectornailsthroughallroundholesintothetopandbottomflangesofthe meyJOISt.• RepeattheabovestepsontheoppositefaceifadoubleIHSisrequired.
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STANDARD FLOOR (Dead Load = 40 kg/m2, Live Load = 1.5kPa/1.8kN)
HEAVy FLOOR (Dead Load = 100 kg/m2, Live Load = 1.5kPa/1.8kN)
MJ240
MJ240
MJ300
Support1 Maxholesize(dxw)
450mm joistspacing
600mm joistspacing
600mm joistspacing
450mm joistspacing
Maxholesize(dxw)Support1
end (X) 50 200 (50)
500 (50)150 (50)
5050
800 (50)
1150 (400)
1600 (1000)
1350(700)
5050850 (50)
750(50)
1300 (600)
150x250
150x250
200x250
200x250
end (X)
end (X)
end (X)
Intermediate (y)
Intermediate (y)
Intermediate (y)
Intermediate (y)MJ300
Overlappingplate installed
Overlapping plates on both sides of the joint installed
50mm from the face of the bearing to the hole edge
Page 14 www.meyertimber.com.au
CAntiLeVers For BALConiesBalconycantilevers,subjecttoexternalweatherexposurecanbeprovidedusingH3preservativetreatedoutriggersasperdetails F11 and F12. For weather proofed applications meyJOISt may be cantilevered to provide balcony support as per detail F13.
Outriggers can be seasoned stress-graded timber or Mt-LVL, either nested against the meyJOISt web and bearing on the top of the bottom flange or placed adjacent to the meyJOISt bearing directly on the support. diagrams illustrating these configurations are shown below. It is strongly recommended that outriggers be H3 preservative treated regardless ofwhether the balcony is weather protected or not.
Someoptionsforoutriggersareincludedinthefollowingtable.ThesehavebeendeterminedusingmaximummeyJOISTspanswithadeadloadof100kg/m2andliveloadof2kPa/1.8kNonthebalconycantilever.Forotherfloorloadsorpotentialoutrigger sizes refer to designIt® or other software.
Table 13: Cantilevers for Balconies
Figure 15: Cantilevers for Balconies
H3preservativetreated
Outrigger
end trimmer
Blocking
Waterproofmembrane/flashing
and painting/stainingrecommended
Singledouble
External Outrigger
Adjacent Outrigger
Nested Outrigger
(Adjacent Outrigger configuration shown)
Outrigger Options
Nested Outrigger (Detail F12)Maximum Balcony
Cantilever (m)Joist Spacing
(mm)meyJOIST section
200mm deep meyJOIStMJ200 45
240mm deep meyJOIStMJ240
300mm deep meyJOIStMJ300
360mm deep meyJOIStMJ360
400mm deep meyJOIStMJ400 90
Adjacent Outrigger (Detail F11)
450 0.8
600 0.7
450 1.1600 1.0450 1.4600 1.3450 1.7600 1.6450 2.0600 1.9
2/90x45F7H3 140x45F7H3
2/140x45F7H3 190x45F7H3
2/190x45F7H3 240x45F7H3 2/240x45F7H3 290x45F7H3 2/290x45F7H3 Notrecommended
Page 15
meyJOIST Section
Code
Tile Roof and Ceiling (90 kg/m2)Roof Load Width
Maximum Single Span (m) Maximum Continuous Span (m)1.8m 1.8m3.6m 3.6m6.0m 6.0m
MJ200 45
MJ240 45
MJ240 63
MJ240 90
MJ255 63MJ300 45MJ300 63
MJ300 90
MJ360 63MJ360 90MJ400 90
2.2 1.6 N/S 2.0 1.3 N/S 2.7 2.2^ 1.4^ 2.7# 1.7# N/S
3.0 2.1 1.4 2.7 1.7 N/S
3.3 2.4 1.6 3.1 1.9 1.3
3.2 2.3 1.5 3.0 1.8 1.2
3.1 2.5^ 1.9* 3.3# 2.0# 1.3#
3.5 2.9^ 1.9^ 3.7# 2.3# 1.5#
4.0 3.3 2.2 4.2# 2.6# 1.8#
4.1 3.3* 2.4* 4.6# 2.9# 1.9#
4.5 3.7* 2.7* 5.3# 3.3# 2.2# 4.8 4.0* 2.9* 5.7# 3.6# 2.4#
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joists suPPorting PArALLeL LoAdBeAring wALLsIn some instances meyJOISt members will be located directly under loadbearing walls and are required to support single storey wall and roof loads. table 14 and table 15 below provide allowable spans for both sheet and tile roof support. For other circumstances such as using double meyJOISt sections or for support of two storey floor and roof loads refer to designIt® (or other) software. the tables below dO NOt apply where girder trusses or jamb stud loads from large openings are supported on floor joists. Contact the Meyer timber® design office for advice.
Table 14: Joist Supporting Parallel Load Bearing Walls – Sheet Roof
Table 15: Joist Supporting Parallel Load Bearing Walls – Tile Roof
Notes:1.Suitable for floor dead load to 100kg/m2 (1.5kPa/1.8kN live load)andmaximumjoistspacingof600mm.2.Minimum45mmendbearingor70mmintermediatebearing unless noted ^(90mm bearing) or #(70mm bearing + web stiffeners).3.Webstiffenerswhererequiredaretobeinstalledinaccordance with detail F6.4. Continuous span bearing for intermediate supports only. For end supports of continuous spans use single span bearing values.5. Suitable for Wind Classifications up to and including N3.
Notes:1.Suitable for floor dead load to 100kg/m2 (1.5kPa/1.8kN live load)andmaximumjoistspacingof600mm.2.N/Sindicatesmaximumspanislessthan1.2m.3.Minimum 45mm end bearing or 70mm intermediate bearing unless noted ^(90mm bearing) or *(45mm bearing+webstiffeners)or#(70mmbearing+webstiffeners).4.Webstiffenerswhererequiredaretobeinstalledinaccordance with detail F6.5. Continuous span bearing for intermediate supports only. For end supports of continuous spans use single span bearing values.6. Suitable for Wind Classifications up to and including N3.
meyJOIST Section
Code
Sheet Roof and Ceiling (40 kg/m2)Roof Load Width
Maximum Single Span (m) Maximum Continuous Span (m)1.8m 1.8m3.6m 3.6m6.0m 6.0m
MJ200 45
MJ240 45
MJ240 63
MJ240 90
MJ255 63MJ300 45MJ300 63
MJ300 90
MJ360 63MJ360 90MJ400 90
2.7 2.3 1.9 3.1 2.2 1.6 3.2 2.7 2.4 4.1# 2.9# 2.1#
3.5 3.0 2.6 4.1 2.9 2.1
3.9 3.4 2.9 4.8 3.4 2.4
3.7 3.2 2.8 4.6 3.2 2.3
3.8 3.3 2.8^ 4.8# 3.5# 2.5# 4.2 3.6 3.1 5.2# 3.9# 2.8# 4.6 4.1 3.6 5.7 4.6# 3.3# 4.7 4.2 3.7^ 5.8# 5.0# 3.6# 5.1 4.6 4.1 6.2# 5.7# 4.2# 5.4 4.9 4.4^ 6.5# 6.0# 4.4#
Pre-FABriCAted meyjoist AVAiLABLe tHrougH MeYer tiMBer®
Meyer timber® has the detailing and fabrication ability toprovideprecisiondocked to lengthmeyJOISTdirect tosite. With further builder co-ordination any holes through meyJOISt and LVL beams can be assessed and included. Based on builder location preference, the design of penetrations is done in-house to ensure large hole are in suitablepositions.Holescanincludeverticallyslottedholestoallowfordrainagefall,roundholesforexhaustventsandround/rectangular holes for air conditioning ductwork.Contact Meyer timber® directly for more information.
Page 16 www.meyertimber.com.au
MetHod For FrAMing CAntiLeVers suPPorting LoAd BeAring wALLsSome or all of meyJOISt cantilevered to support a load bearing wall may require reinforcement. this requirement needs to be considered in design and specified in the design documentation. details for reinforcement are given in details F21 and F22.
Regardless of whether reinforcement is required or not, cantilevers with span greater than the joist depth are to be installed withcontinuousblockingatthecantileversupportandatrimmingjoist(orequivalent)providingloaddistributionattheendsofthecantileveredjoists.Theuseofatrimmingjoisthelpstobothstiffenthecantileverandlimitlongtermdifferentialdeflections. For installation see detail F15 or detail F15a.
Short cantilevers (LC<d)mayneedreinforcementbutintermittentblockingonlyisneededatthecantileversupportandthetrimmingjoistneednotbeincluded–seeDetailF14.
LAterAL stABiLitYLateralwindandearthquakeforcesdeterminedfortheupperstoreymustbetransferredthroughthefloortothetopplate(andthebracingsystem)ofthelowerstorey.Wheretheseforcesareperpendiculartothedirectionofjoists,intermittentblockingorthefixingsto‘rimboard’orboundaryjoistsmaynotbeadequatetotransferthefullextentoftheforces.Toachievethetransferoflateralforcesitisrecommendedthatsufficientblockingbeinstalledtoresistrackingforcesfromthebracingunits.Figure18showsanexampleofhowtotransfertheseloadsthroughthefloordepthforhighcapacitybracingsystems.
Figure 16: Method for Framing Cantilevers Supporting Load Bearing Walls
Figure 17: Racking Loads
Laodbearing wall
dd
Loadbearing wall
Intermittentblocking
Short Cantilever (See Detail F14)
Racking loadsneed to betransferredthrough floorsto the lowerstorey wallbracing system
Long Cantilever (See Detail F15 or F15a)
Continuousblocking
Lc > dLc < d
Page 17
tie-downIn general, tie down details applicable for solid timber joists asspecifiedinAS1684canalsobeusedwithmeyJOISTexceptthat bolting through the flanges of meyJOISt is not permitted.
detail F9 shows how internal bracing walls may be tied down to a meyJOISt floor system.
PRODUCT FAULTS
Faults in manufacture do sometimes occur and faulty product may from time to time reach the market despite eventhe most stringent controls of the manufacturing process and quality. Please let us know if you receive any productthat you have concerns with – call your local Meyer Timber® office even if you have solved the problem and a claim‘is not worth the hassle’.Wewant toknowso thatwecandobetter.Better still,email thesupport linewithanyqueriesat: [email protected] (VIC/taS) or [email protected] (NSW/aCt/QLd).
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Figure 18: Example of Continuous Blocking and tie-down for high capacity bracing units (eg. > 3.4kN/m)
DO NOTbolt throughmeyJOISTflanges
Securebottomplatetoblockingas per aS1684 requirements
Tie-downsatextremitiesofupper storey bracing panels
Secureblockingtotopplate to match capacity of upper storey bottom plate toblocking
IMPORTANT NOTICE AND WARNING: While the products in this document possess the characteristics described, no representation is made that the products will be effective in all locations and circumstances. Much depends upon building design, construction practices and the environment in which the products are used. Statements about the attributes and performance characteristics of the products are made on the assumption that the products are properly stored, handled, installed, used and maintained in their relevant application. You should not rely solely on this document when using meyJOIST. Meyer Timber® recommends obtaining professional building advice which takes into account your particular circumstances and site conditions. Failure to install meyJOIST products in accordance with applicable building regulation requirements and instructions may lead to personal injury, loss or damage and may adversely affect the performance of the products.
Page 18 www.meyertimber.com.au
Detail F1
Blocking with meyJOIST
meyJOISTblockingsecured using minimum3/3.06Øx75mmlongframing nails topand bottom
Upperwallplate/battenfixedtojoistsand/orblocking
Detail F2
Blocking with steel strapping
Upper wall plate/battenfixedtojoists
Fixstrappingwith3/2.8Øx30mmlongconnector nails tojoist and supports
30x0.8mmgalvanised steelstrap (or equivalent)
Detail F3
Sheet bracing secured towall plates or battens using2.5Øx30mmlongflatheadnails at 150mm centres
Sheet bracing length to beminimum 2 joist spacings
Upperwallplate/battenfixedtojoistsand/orblocking
Detail F4 70x35(min)packerfixedtotopofsteel
Webstiffenerfixedusingnails(not screws)
Face mount (IJF)joist hanger
Steel Beam
top mount (IJt)joist hanger
35mmthick(min)solid timber cutneatly betweensteel flanges andfixedtopackers
allowablesheetbracing:-7mmF8Plywood- 4mm F22 plywood-4.8mmHardboard-6mmOS’Brace
70x35(min)packersfixedto steel
partial heightjoist hanger
Hanger fixing options for meyJOIST to steel
Detail F5
Blocking with sheet bracing
Fixing at supports
Minimum 40mmend distance
ensure adequatebearing length
3.06Øx75mmlongframingnailsthrough flanges. typical one each side of web
Web stiffener installation
Double joist web stiffenersOther notes as per Detail F6
Detail F6 Detail F6a
3mm gap
Nail/Screwboth webs tostiffener
Minimum webstiffenerthicknessistwice that given fordetail F6
No gap
3.06Ø clenchnails or 12gType17Hexhead screws
meyJOISt flange width 45 63 90Stiffenerthickness 18 27 393.06Ønaillength 50 75 10012g screw length 45 65 90(14g)
≤300 deep use 3 nails or 2 screws each side>300 deep use 4 nails or 3 screws each side
Page 18
Note:Alldimensionsinmm.
Page 19 www.meyertimber.com.au
12mm(maximum)
12mm(maximum)
Steel
do not tapercut joist pastline of support
meyJOIST flange notching
DO NOT OVERCUT
Flange notching to occurat end supports only
Notch must end within 5mm of support
Detail F8
meyJOIST web notching for steel
≤300 deep use 4 nails or 2 screws each side>300 deep use 5 nails or 3 screws each side
Notch as perDetailF7permissible
portion may be removedwithin line of support only
No gap
3mm gap
Steel
3.06Ø clench nails or 12gType17Hexheadscrews as per detail F6
Maximum1/2joist depth
Detail F7
Detail F9
Internal bracing wall tie-down
Bridging piecerecommended undereach end of bracingunits where nominaltie-down specified
Bracing wall
Fastener - seetable below
Fastener design Uplift2/3.6Øx75mmnails NominalM12bolt&washer 13kN
3/2.8Øx50mmlong framingnails each side
90x35packermin200mm long
90x45MGP10bridging piece
90
Detail F10
meyJOIST / meyJOIST connection
top mount (IJt)joist hanger
25x0.8mmgalvanisedsteeltiestrapfixedtoeachmemberwithminimum3/30x2.8mmflatheadnails
Detail F11
Adjacent Outrigger
Minimum1.5xSc Sc
20
No gap
Outrigger
meyJOISt
Plywoodpackertop and bottom
50 typ.60
30
2rowsof12gType17Hexheadscrews or galvanised flat headnails at 150mm centres as shown
≤300deep7nailsor4screwseachend>300 deep 9 nails or 5 screws each end
meyJOISt flange width 45 63 90Packerthickness 18 27 392.8Ø nail length 50 65 N/a12gscrewlength 50 65 75*
all dimensions in mm* denotes 14g screw
Page 19
Allfixingsthroughwebandpackerintooutrigger.
Page 20 www.meyertimber.com.au
Detail F12
all dimensions in mm* denotes 14g screw
2060
30
50 typ.
meyJOISt
Outrigger
No gap
Timberblocks(tomatch meyJOIStflangethickness)
≤300deep7nailsor4screwseachend>300 deep 9 nails or 5 screws each end
double outrigger nailing to match as shown for single outrigger.
2rowsof12gType17Hexheadscrewsor galvanised flat head nails at 150mm centres as shown
Minimum1.5xSc Sc
Outrigger Single doubleOutriggerthickness 35 45 35 45Nail(min.2.8Ø)length 40 50 75 9012gscrewlength 45 50 75* 90*
Nested outrigger installation
meyJOIST cantilever for internal or weather proofed balcony application
meyJOIST short cantilever support
Detail F13
Detail F14
Lc≤ d
d
Loadbearing wall
Joistbackspannotless than 2 timesthe cantilever span
meyJOISt or solidblockingforallcantilevered joists
Usefulldepthblockingorcompressionblocksto transfer roof loadsto support
ForexternalusemeyJOISTfloorjoistsmust be protected from becoming wetby a fully waterproof coveringend trimmer
65mmminimum bearingCantile
ver span
Intermittentblocking
When specified installreinforcement as perdetail F21 or detail F22
Page 20
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Detail F17
Rimboard or boundary joist with meyJOIST
Detail F15 Detail F15a
Detail F16
meyJOIST long cantilever supportwith underbatten
meyJOIST long cantilever supportwith end trimmer
Cantilever sheet bracing end trimmer installation
Continuousblockingto cantilever joists
Loadbearing wall Load bearing wall
Continuousblocking
dd
Continuous trimmingjoist or sheet bracingframed closureattached to the endsof all joists - seedetail F16
When specified installreinforcement as perdetail F21 or detail F22
Sheet bracing secured towall plates or battens using2.5Øx30mmlongflatheadnails at 150mm centres
Allowablesheetbracing:-7mmF8Plywood- 4mm F22 plywood-4.8mmHardboard-6mmOS’Brace
When specified installreinforcement as perdetail F21 or detail F22
Flooring
Continuous wall plate or battenaboveandbelowandfixedtoeachmeyJOISTwith2/3.06Øx75mmlong framing nails
plywood or hardboard joined overtimber cleat and nailed withminimum 4 nails
Loadbearing wallWall bottom plate
Flooring
Splice between joists usingsame material 1 framing nail per flange.
Length to have 30mmmeyJOISt penetration
meyJOISt bearingto be as per
supporting floor only
Rimboard(17mm)orboundary joist
Face mount (IJF)joist hanger
35-45mmthickendtrimmer
Wall tie downto end trimmerby others
Underbatten
See Detail 15a foralternative option
See Detail 15 foralternative option
Lc > d
Lc > d
Page 21
Page 22 www.meyertimber.com.au
Detail F22
Detail F18
Detail F21
Cantilevers supporting loadbearing walls - Type 2 reinforcement
Cantilevers supporting loadbearing walls - Type 1 reinforcement
Installation of compression blocks
One or more compressionblocksofsimilarcombinedcross sectional area to that ofthe supported jamb stud or post
Loadbearing wallaligned under
15mm F11 structuralplywood cut to samedepth as joist
15mm F11 structuralplywood both sidescut to samedepth as joist
Nail plywood reinforcementtoflangesusing2.5Øx50mmlong flat head nails at 100mm centres
Nail plywood reinforcementtoflangesusing2.5Øx50mmlong flat head nails at 100mm centres
Type 1 - 15mm minimum dd F11 Structuralplywood nailed to one side of each joist- ply to full depth of joist- Face grain horizontal-Nailfixedasdetailed
Type 2 - 15mm minimum dd F11 Structuralplywood nailed to both sides of each joist- ply to full depth of joist- Face grain horizontal-Nailfixedasdetailed
*Plywood web stiffeners ofsuitable thickness availableas accessory product
*Plywood web stiffeners ofsuitable thickness availableas accessory product
All dimensions in mm* denotes 14g screw
All dimensions in mm* denotes 14g screw
Minimum1.5xSc
Minimum1.5xSc
Sc
Sc
100
100
Plywoodwebstiffeners*
Plywoodwebstiffeners*
Face grain direction
Face grain direction
plywood webstiffeners*
plywood webStiffeners*
12gType17Hexheadtimberscrewsorgalvanisedflatheadnailsthroughstiffener,webandintoouterstiffener(3 places, minimum 3 screws or 5 nails each)
12gType17Hexheadtimberscrewsorgalvanisedflatheadnailsthroughstiffenersbothsides(3 places, minimum 3 screws or 5 nails each)
Single nail to flangeas shown
Jamb stud or post
Compressionblockcut 1mm longerthan joist depth
meyJOISt flange width 45 63 90Webstiffenerthickness 18 27 39Nail(min.3.06Ø)length 75 90 9012gscrewlength 50 65 75*
meyJOISt flange width 45 63 90Webstiffenerthickness 18 27 39Nail(min.3.06Ø)length 75 90 9012gscrewlength 50 65 75*
Page 22
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meyjoist For use As rAFtersmeyJOISTmayalsobecomepartofaveryeffectiveandeconomical roofsystem,particularlywhere lowpitchroofswithceilingdirectlyattachedtotheundersidearebeingdesigned.meyJOISTraftersallowtheflexibilityofhavingprovisionfortheinstallationofductingandelectricalservicesthroughtheweb,whilstofferingampleroomtoincludeinsulation.
meyJOISt may be used for pitched roofs up to 35 degrees if special attention is paid to connection and tie-down. It is importantthattheconnectionofraftersincludesfortheeffectsofwindloadingaswellasdead,liveandsnowloadswhereapplicable.
Rafter tie-downusing looped over straps is recommendedwhilst bracing requirements do not differwith the use of ameyJOISt roof system.
ManyoftheconstructiondetailsdonotdifferwhethermeyJOISTisusedasraftersorfloorjoists.Wherethefollowingrafterdetailsarespecifiedinsoftwareoutputstheassociatedfloordetailscanbeused:DetailR1 –Joisthangersforceilingjoists:SeeTable4.DetailR2 –Nailingdowntosupports:SeeDetailF5.DetailR3 –LateralRestraint–blockinginstallation:SeeDetailF1.DetailR4 –Carportpurlins–bracketinstallation:SeeTable4(Partialdepthhangersonly).DetailR5 –Restraintatsupportsbracedwithmetalstrap:SeeDetailF2.Tobeinstalledevery2ndrafter(minimum).DetailR6 –Restraintat supportsusingblocking: SeeDetail F1.Maximumblocking spacing1.8mor3 rafter spacings, whichever is greater.DetailR15 –Raftertie-down:Usingloopedsteelstrap:SeeDetailR13.DetailR24 –Rafteroverhang:Horizontalsoffitwithraftersbirdsmouthedatsupport:SeeDetailR9.DetailR25 –Webstiffening/packingforrafters:SeeDetailF6.
RAFTER SPAN TABLES
ThefollowingspantableshavebeenpreparedinaccordancewithAS1720.3:2016andarebasedonthefollowingdesigncriteria:
designIT®allowsforthedesignandspecificationofmeyJOISTraftersforotherapplicationsincluding:
• Raftersareforahouse.• The bottom flange is restrained by ceiling or ceiling battensatmaximum600mmcentres.• Thetopflangeisrestrainedbyroofbattensatmaximum 900mm centres.
• Roofmassdoesnotexceed40kg/m2, i.e. sheet roof and ceiling.• WindClassificationsuptoandincludingN3.• Permanent load serviceability design limit: span/300 or 20mm for main span and 10mm for overhang value.
• Roofmassfrom10kg/m2to90kg/m2.• Fullrangeofwindclassifications.• Rafters where continuous restraint is not provided to the bottom flange.• Overhangswithhorizontalsoffits.
• Facefixingtoridgebeamsanddetailsforbirdsmouthing over supports.• Alternatefixingdetails.• ContinuousSpans
Table 16: meyJOIST Single Span Residential Rafters (Sheet roof and ceiling)
Note:Span refers to the distance between the centerline of the supports, measured along the roof pitch. Span valuedesignedwithzerooverhang.Overhangvalueisdesignedinconjunctionwithmaximumspan.
Rafter spacing (mm)
600
Span (m) MJ200 45 5.1 1.1 4.5 1.1
MJ240 45 5.8 1.3 5.3 1.4
MJ240 63 6.4 1.4 5.9 1.5
MJ240 90 7.0 1.6 6.4 1.7
MJ300 45 6.8 1.6 6.2 1.7
MJ300 63 7.3 1.7 6.6 1.8 MJ300 90 7.9 2.0 7.2 2.0 MJ360 63 8.1 2.0 7.4 2.1 MJ360 90 8.7 2.3 8.0 2.4 MJ400 90 9.2 2.6 8.4 2.6
Span (m)OH (m) OH (m)
900meyJOIST
SectionCode
Page 24 www.meyertimber.com.au
Bevelled timberbearing plate -refer to detail R10
Birdsmouth cut tobear fully on top ofplate. Minimum bearing 45mm
3-4mm gap
Webstiffenerinstalled as perdetail F6
Bevel cut flange to bear fullyon top plate - minimumbearing 45mm
For rafters withoverhangs seeseparate detailsprovided
DO NOT CUTBEyOND FLANGE
FLANGE MUSTNOT OVERHANG
SUPPORT
Horizontalsoffitcut permitted ifrequired
For tie down refer tosoftware output forrequirements
3.06Øx75mmlongframing nail on each side
Minimum bearing length not less than45mm or as specified by software output
Install bevelled timber bearingplate - ensure tie downcontinues through to top plate
Install pryda mini-grip(or similar) both sidesandfixwithnailsasspecified
Roof Rafter Installation of mini-gripspitch Spacing (mm) (or similar)≤10o ≤1200 Not required >1200 Fixedwith2nailspertab10oto35o ≤1200 Fixedwith4nailspertab >1200 Fixedwith5nailspertab
Fix2/90x35 MGp12(one to eachside) tightagainst bottomflange. Clenchnail with tworowsof3.15Øx90mm long flathead nails at60mm centres
Bevelled timberbearing plate -refer to detail R10
Fix70x35MGP10(oneeachside) using two rows of3.06Øx75mmlongframingnails at 100mm centres
Fascia
Fascia
Maximumoverhangas specified
Overhang span
permitted bevel cut details
Suggested cuttingof bevelled plate
Notching at high end not allowed
Flange must notoverhang support
45mmminimumbearing
60
70
45
30
30
equal to overhangspan but not less
than 600mm
750mmmaximumoverhang
100
Rafter overhang:sloping soffit with bevelled plate support
Rafter overhang:sloping soffit with rafters birdsmouth at support
Rafter overhang:horizontal soffit with bevelled plate support
Detail R8Detail R7
Detail R9 Detail R11
Rafter bevel cut to supports
Detail R10
Fixing and support using bevelled plate
For roof pitches greater than 35o seek engineers advice.Nails as specified by mini-grip manufacturer.
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Detail R17
Intermediate lateral restraint for rafters:using battens and blocking
Detail R13 Detail R16
Detail R14
Rafter tie-down - using looped steel strapRafter support at ridge:
supported on a bevelled plate
Rafters support at ridge: face fixed to ridge beam
Bracketsrequired- see detail R10
Bevelled timberbearing plate -refer to detail R10
For tie down refer tosoftware output forrequirements
3.06Øx75mmlong framingnail on each side
30x0.8mmor25x1.0mmgalvanised mild steel straps looped over rafter and nailed to supports as specifed in the software output
30x0.8mmor25x1.0mmgalvanised mildsteelstraptieasshown.Fixat eachendwith7connectornails
30x0.8mmor25x1.0mmgalvanisedmildsteelstraptieasshown.Fixat eachendwith7connectornails
For 2nd Multigriplocate at top as shown
Locate Multigrip asshown
Ridge beam
InstallationofMultigrips:- Install with split toward middle of beam depth- For MJ200 and MJ240 use 1 Multigrip each side- For MJ300 and deeper use 2 Multigrips each side- Nail to each member as specified in the program output - distribute nails uniformly
Webpackinginstallas per detail F6
Variableslopebracketsmaybeused where available - refer to manufacturer’sspecifications
meyJOISTblocking
2/3.06Øx75mmlongframing nails per rafter
4/3.06Øx75mmlongframingnailsperblockingpiece (distribute evenly)top and bottom
Blocking3600mmmaximumspacing
Install intermediate battens andblockingatmid-span,thirdpointsor quarter points as specified bysoftware output
=
=
Roof batten
Roof battens
Fascia
70x35MGP10under batten
pryda Multigrips(or similar) on both
sides as specified below
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Detail R26
Nested rafter outrigger
Detail R18
Detail R23
Intermediate lateral restraint for rafters:using ‘hit and miss’ blocking
Blocking Detail
Lateral restraint for rafters:ceiling providing restraint to bottom flange
12gx50mmlongType17Hexheadscrew(TYP)
Blockingeverysecond rafter spacing
Fascia
Ceilingdirectlyfixedto underside
Ceilingfixedtotopof bottom flange
Ceilingbattens(max.600mmspacing)fixed
to underside
Packer
35mmTimberPacker
50
5060
15
30150
15
20
Fascia
3-4mmexpansion
gap
Webstiffener
Packing/stiffenerinstall as detail F6(see Section view)90x45MGP12
outrigger
Overhang
(maximum750
mm)
Minimum1.5
xoverha
ng
Minimum 5nails at each endUse flat head galvanised nails with sufficient
length to penetrate the receiving outrigger by at least 30mm
Outrigger installed in contact with top flange of meyJOISt
Note:Tiedownnotshownforclarity.Refer to software output requirements.
Section(at support)
9mm structuralplywood
SeeblockingDetail
2.5Øx40mmlongflathead nails at 100mm centres
Install‘hit&miss’blockingatmid-span,thirdpointsorquarter points as specified by software output
Roof batten
Roof batten
meyJOISt
Roof batten
meyJOISt
meyJOISt
Ceiling
Ceiling
CeilingCeiling batten
70x35MGP10
100maximum
100
=
=
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Rafter and TrussFastening System
Page 27 www.meyertimber.com.au
Fire And ACoustiCs – CLAss 2 And 3(MuLti-residentiAL) BuiLdingsTheNationalConstructionCode(NCC)isAustralia’sprimarysetoftechnicaldesignandconstructionprovisionsforbuildingsandisavailabletodownloadfreefrom:www.abcb.gov.au.Thereare10separateclassesofbuildingsintheNCCwhichrelatetotheirpurpose. meyJOISt is commonly used in Class 1 buildings (or houses) where the main consideration is structural suitability. Floor systems using meyJOISt, in combination with specific floor coverings and ceiling systems, can also be used in Class 2 or 3 buildings (multi-residential) where the systems must also meet minimum requirements for both fire and acoustics. It can also be used for all other classes of buildings such as retail, school, residential care or office buildings if it meets the fire-protected timber requirements of the BCa. these requirements are outlined in the Building Code of australia (BCa) Volume 1 which is part of the NCC.
FIRESection C in the BCa Volume 1 outlines the performance requirements for fire resistance and Specifications C1.1 outlines the deemed-to-Satisfy (dtS) Fire-Resisting construction requirements of building elements, including floors. this is typically described as a Fire Resistance Level (FRL) represented by the time in minutes for three fire test failure criteria - structural adequacy, integrity, andinsulation.Table17providesrequirementsforfloorsystemsinClass2or3buildings.
Notes:1. the use of fire-protected timber is mandatory for 4-storeys and above, in accordance with C1.13 of BCa (NCC 2019). the floor/ceiling system must also have a resistance to the incipient spread of fire (RISF) ≥ 45mins where 2 layers of 13mm thickfireprotectivegradeplasterboardwillcomply.2.ClauseC1.1Clause3.10(c)providesaconcessionforbuildingsfittedwithsprinklers.3. Fire-protective coverings can be 13mm fire-protective grade plasterboard or 12mm fibre cement. 4. Clause C1.5 allows 2-storey Class 2 and 3 buildings to be considered as type C construction if each sole-occupancy unit has its own direct access to a road or an open space.
ACOUSTICSas part of dtS Requirements of the BCa Volume 1, floors separating sole-occupancy units or a sole-occupancy unit from a plant room, lift shaft, stairway, public corridor/lobby etc must provide insulation against transmission of airborne and impact (structure-borne) generated sound sufficient to prevent illness or loss of amenity to the occupants. table 18 summarises the code requirements.
the acoustic performance of a floor system is dictated by the type of floor coverings in combination with the ceiling systems, withoutmuchrelianceonthetypeofjoistsystem.Carpetwithfoamunderlaysarewellknownfortheirabilitytominimizeimpactnoise. typically, ceiling systems would comprise of acoustic underlays, furring channels on resilient mounts and fire-rated ceiling.
THERMAL INSULATIONas part of the deemed-to-Satisfy provisions of the energy efficiency requirements of the BCa, internal floors must achieve a minimum R value of 2.0 for most areas in australia.
Figure 19 illustrates a typical example. For more information on using meyJOIST in apartments and multi-residentialconstruction, contact the Meyer timber® design office.
FIRE - BCA (NCC 2019) DTS Requirements for Floors
ACOUSTIC - BCA (NCC 2019) DTS Requirements for Floors
Deemed to Satisfy Provision(Laboratory performance)
Rw + Ctr
(airborne Sound)dnt,w + Ctr
(airborne Sound)Ln,w
(Impact Sound)Lnt,w
(Impact Sound)
Verification Method(In-situ performance)
Fire Resistance Levels (FRL) Class 2 and 3 BuildingsWith Sprinklers
Type ofConstruction
No. ofStoreys
4 or more a 90/90/90 ^1 N/a
30/30/30 or fire protective covering^3
30/30/30 or fire protective covering^3 30/30/30 or fire protective covering^3
30/30/30 or fire protective covering^3
3 a 60/60/60 ^2 90/90/90
2
2
B
C^4
Without Sprinklers
≥50 ≤62 ≤62≥45
Note: Below are examples for reference only. Tested system configurations need to be specified in the documentation and approved by the regulatory authorities.
Floor Covering:Bareflooring:Ln,w=60-62≤62Timberfloor+acousticunderlay:Ln,w=54-56≤62Carpet+acousticunderlay:Ln,w=40-50≤62
Rw+Ctr = 51-54 > 50 (for all floor covering types)
Flooring (minimum):19mmparticleboardor18mmOS’FloororequivalentCeiling lining:
FRL 90/90/90 - fire rated plasterboard (2/16mm)FRL 60/60/60 - fire rated plasterboard (1/16mm + 1/13mm)FRL 30/30/30 - fire rated plasterboard (1/13mm) Furring channel: on resilient mounts
meyJOIST: (minimum 240mm deep)
Insulation (cavity infill): R2.5 glasswool or equivalent
Figure 19: A Typical BCA DTS Compliant Floor System for Class 2 or 3 Buildings
Table 17: NCC2019 FRL Requirments for Floors
Table 18: NCC2019 Acoustic Requirements for floors
the required FRL is usually achieved in a system through use of fire rated linings such as plasterboard, fibre cement board or fire rated fabrics.
Page 28
DISCLAIMER
The information contained in this document is current as May 2020 and is based on data available to Meyer Timber® at the time of going to print. Meyer Timber® reserves the right to change the information contained in this literature without prior notice. It is important that you call Meyer Timber® to confirm that you have the most up to date information available or refer to www.meyertimber.com.au.
Meyer Timber® has used all reasonable endeavours to ensure the accuracy and reliability of the information contained in this document. This information does not replace professional advice and we recommend that professional advice should be obtained specific to your circumstances. To the extent permitted by law, Meyer Timber® will not be liable for any inaccuracies, omissions or errors in this information nor for any actions taken in reliance on this information.
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