CREATING ROOFSCAPES WITH TRUSSED RAFTERS · Fig. 3 Typical ‘L’ return PAGE 3 Fig. 4 Overlaid...

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CREATING ROOFSCAPES WITH TRUSSED RAFTERS Trussed Rafters have become part of the modern building vocabulary. Around 95% of all new house roofs are constructed using trussed rafters as are an increasing proportion of roofs for nondomestic premises such as offices, retail outlets, hospital extensions, leisure developments etc. The trussed rafter form of construction is well known for its economy, off site prefabrication, speed of erection and the minimal environmental impact of its timber base. What is not always so readily recognised is the flexibility and adaptability of the system and its ability to cope with a wide range of roof shapes such as hips, intersections, corners etc without the need for any special forms of construction. The variation in roofing styles possible with trussed rafters is unlimited. Within this Product Data Sheet are a series of standard details of differing roof styles. These are the most commonly constructed roof shapes and the detailed solutions indicate a way of achieving them. It must be stressed that these are not absolute solutions but simply give an idea of how roofscapes may be easily achieved. It is hoped that by showing these few solutions users and specifiers will see that many differing roof profiles may be solved using the same simple, readydesigned techniques. However, it must be stressed that each specific case will have its own individual characteristics and readers are strongly recommended to contact a TRA Member fabricator/designer as early as possible in a project in order to discuss a detailed solution. Sheet No.6 May 2007 PRODUCT DATA SHEET Duopitch Hipped ‘L’ return ‘T’ intersection Dormer Dogleg Monopitch Overlaid hip Gablet Dutch or Barn hip Mono ‘L’ return/hip

Transcript of CREATING ROOFSCAPES WITH TRUSSED RAFTERS · Fig. 3 Typical ‘L’ return PAGE 3 Fig. 4 Overlaid...

Page 1: CREATING ROOFSCAPES WITH TRUSSED RAFTERS · Fig. 3 Typical ‘L’ return PAGE 3 Fig. 4 Overlaid hip Ridgeboard Set of multiple mono valley frames (smallest omitted for clarity) Compound

CREATING ROOFSCAPES WITH TRUSSED RAFTERSTrussed Rafters have become part of the modern buildingvocabulary. Around 95% of all new house roofs are constructedusing trussed rafters as are an increasing proportion of roofs fornondomestic premises such as offices, retail outlets, hospitalextensions, leisure developments etc.

The trussed rafter form of construction is well known for itseconomy, off site prefabrication, speed of erection and theminimal environmental impact of its timber base. What is notalways so readily recognised is the flexibility and adaptability ofthe system and its ability to cope with a wide range of roofshapes such as hips, intersections, corners etc without the needfor any special forms of construction. The variation in roofingstyles possible with trussed rafters is unlimited.

Within this Product Data Sheet are a series of standard detailsof differing roof styles. These are the most commonlyconstructed roof shapes and the detailed solutions indicate away of achieving them. It must be stressed that these are notabsolute solutions but simply give an idea of how roofscapesmay be easily achieved.

It is hoped that by showing these few solutions users andspecifiers will see that many differing roof profiles may besolved using the same simple, readydesigned techniques.

However, it must be stressed that each specific case will haveits own individual characteristics and readers are stronglyrecommended to contact a TRA Member fabricator/designer asearly as possible in a project in order to discuss a detailedsolution.

Sheet No.6 May 2007P R O D U C T DATA S H E E T

Duopitch Hipped ‘L’ return

‘T’ intersection Dormer Dogleg Monopitch

Overlaid hip Gablet Dutch or Barn hip Mono ‘L’ return/hip

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PA G E 2

Fig. 1 Flat top hip

Fig. 2 Typical ‘T’ intersection

Hip boards to be birdsmouthedover the compound girder of flattop trusses and over thewallplate

Compound girder of flat toptrusses permanently fixedtogether

Standard trusses to main roof

Flat top trusses supplied withextended rafters for site cuttingto suit hip boards

Noggings to be nailed to ceilingjoist and side of jack rafter

Monopitch trusses supplied wthextended rafters for site cuttingto suit hip boards

Infill jack rafters to be aminimum of 25mm deeper thantrussed rafter rafter members toallow for birdsmouthing atwallplate

Infill ceiling joists

Lateral bracing

Jack raftersshown in partonly for clarity

Set of multiple diminishingvalley frames nailed directly tothe main trussed rafters. (Theinternal members of the valleyframes are omitted for clarity)

Compound girder of ‘Howe’trusses permanently fixedtogether

Standard trusses with eavesoverhang removed on ‘T’ side

Standard trusses to main roof

If a loadbearing wall or beamis available to span betweenpositions A-A to support thestandard trusses of the mainroof, the ‘Howe’ girder can besubstituted by a standardtruss on the ‘T’ return roof

A

A

Page 3: CREATING ROOFSCAPES WITH TRUSSED RAFTERS · Fig. 3 Typical ‘L’ return PAGE 3 Fig. 4 Overlaid hip Ridgeboard Set of multiple mono valley frames (smallest omitted for clarity) Compound

Fig. 3 Typical ‘L’ return

PA G E 3

Fig. 4 Overlaid hip

Ridgeboard

Set of multiple mono valleyframes (smallest omitted forclarity)

Compound girder of multipletrusses permanently fixedtogether

Compound girder of flat toptrusses permanently fixedtogether

Lateral bracing

Standard trusses with eavesoverhang removed on hip side

Set of multiple valleyframesincluding two special flattop frames to spread imposed load

Standard trussed rafters

Standard trusses to main roof

Compound girder of flat toptrusses permanently fixedtogether

Hip boards to be birdsmouthedover compound girder of flattop trusses and over wallplate

Page 4: CREATING ROOFSCAPES WITH TRUSSED RAFTERS · Fig. 3 Typical ‘L’ return PAGE 3 Fig. 4 Overlaid hip Ridgeboard Set of multiple mono valley frames (smallest omitted for clarity) Compound

PA G E 4

T R U S S E D R A F T E R A S S O C I AT I O NP.O.Box 571Chesterfield S40 9DHTel & Fax: 01246 230036email:[email protected]

www.tra.org.uk

This product Data Sheet has been produced to give some ideas on how trussed rafter construction may be adapted in order to provide arange of roof intersections within the overall roof structure. However, it must be stressed that these are typical solutions and each roofwill have its own individual characteristics, readers are strongly recommended to contact a TRA Member fabricator/designer as early aspossible in a project in order to discuss a detailed solution.

More details on trussed rafter construction are contained within the TRA ‘Technical Hanbook’ which is a priced publication available fromthe Trussed Rafter Association at the address given below.

The guidelines within this Data Sheet are issued in good faith but without liability and its use is entirely at the user’s risk.

Fig. 5 Dogleg intersection

RidgeboardRidgeboard supportledgers nailed tocompound girdertrusses

Standard trussesto main roof

Binders

Infill ceilingjoists

Compound girder trusses permanently fixedtogether

Infill rafters to be25mm deeper thantrussed raftermember to allow forbirdsmouthing atpurlin and wallplate

Standard trussedrafters to main roof

Compoundgirder truss

Purlin

Purlin support securely nailed tointernal truss member. Minimumsize to be 60mm x width ofcompound truss

The five roofscapes illustrated on this Product Data Sheet are those most commonly constructed.There are many other ways of framing hips, corners, and intersections etc with trussed rafters.Please contact your TRA trussed rafter fabricator for details. Throughout this document requiredwind and stability bracing has been omitted for clarity

Common raftersomitted forclarity


CREATING ROOFSCAPES WITH TRUSSED RAFTERS - … · CREATING ROOFSCAPES WITH TRUSSED RAFTERS ... speed of erection and the ... Overlaid hip Gablet Dutch or Barn hip M o n‘L’ retu

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Moisture Cycling of Trussed Rafter Jointsu. s. forest service research paper fpl 67 november 1966 moisture rafter joints cycling of trussed u. s. department of agriculture forest service

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GB 1800114819-centrale vapeur express.qxd:Mise en page 1 ......1/4 fig.1 fig.2 fig.3 fig.5 fig.6 fig.7 fig.13 fig.10 fig.14 fig.11 fig.15 fig.17 fig.18 fig.19 fig.21 fig.22 fig.9 fig.4

Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7

Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7

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Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9.