Bs2482 Mill Cert

852482=2009

Specification for timberscaffold boards

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f,t;ilrraising standards worldwide''Brit ish Standards

BS 2482:2009 BRITISH STANDARD

Publishing and copyright informationThe BSI copyright notice displayed in this document indicates when thedocument was last issued.

@ BSr 2009

lsBN 978 0 580 54403 3

rcs 91 .220

The fol lowing BSI references relate to the work on this standard:Comm ittee referen ce B/51 4/42Draft for comment 08/30113948 DC

Publication historyFi rs t publ ished May 1954First revision, February 1963Second revision, August 1970Third rev is ion, Ju ly 1981Fourth revision, June 2009

Amendments issued since publication

Date Text affected

BRITISH STANDARD BS 2482:2009

ContentsForeword ii1 Scope 12 Normative references 13 Terms and def in i t ions 14 Types of t imber 25 Dimensions and to lerances 36 Construction 37 Timber qual i ty 58 Factory production control 179 Mark ing 18

AnnexesAnnex A ( informative) Propert ies of scaffold boards IgAnnex B ( informative) Support centres 20Annex C ( informative) Method of test for determining bendingstrength 21Bib l iography 23

List of figuresFigure 1 - Typical knots and groups of knots 7Figure 2 - Measurement of rate of growth 13Figure 3 - Measurement of s lope of gra in 13Figure 4 - Measurement of wane 14Figure 5 - Measurement of bow spring, twist and cup for a 3.9 mboard 15Figure C.1 - Set-up for test ing of scaffold boards 2l

List of tablesTable 1 - Timbers for machine grading of scaffold boards , for whichsett ings have been derived 2Table 2 - Timbers for visual grading of scaffold boards 2Table 3 - Target cross-sectional sizes 3Table 4 - Cook Bol inder grade set t ings 17Table 5 - Computermatic and Micromatic grade sett ings l7Table A.1 - Strength propert ies 19Table 8.1 - Target spans 20Table C.1 - Ult imate moments to be achieved in load tests 22

Summary of pages

This document comprises a front covel an inside front covelpages i to iV pages 1 to 24, an inside back cover and a back cover.

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ForewordPublishing information

This Brit ish Standard is publ ished by BSI and came into effect on30 June 2009. lt was prepared by subcommittee 81514/42, Accessand working platforms, under the authority of Technical Committee81514, Access and support equipment. A list of organizationsrepresented on this committee can be obtained on request to i tssecretary.

Supersession

This Brit ish Standard supersedes BS 2482:1981, which is withdrawn.

Information about this document

This is a ful l revision of the standard, and introduces the fol lowingpr inc ipal changes.

a) 50 mm th ick boards are no longer inc luded wi th in the standard.

b) The method of select ion of 38 mm thick boards has been revisedand two grades with dif ferent maximum support centres (1.2 mand 1.5 m) are now speci f ied.

c) The method of select ion of 63 mm thick boards has been revisedand a s ingle grade wi th maximum support centres of 2 .5 m isnow specif ied.

d) Annex A provides updated information on the performancecharacterist ics of boards conforming to this standard.

e) Annex B provides information on support centres, which aredefined in terms of a ' target span'with a sett ing-out al lowance.

Guidance on the use of scaffold boards in access scaffolding is givenin the National Access and scaffolding Confederation's technicalguidance notes, A guide to good practice for scaffolding with tubesand fittings (TG20:05) l1l and also BS EN 12811 for scaffold platforms.

Attention is drawn to the UK government's t imber procurementpol icy, which requires that t imber used at construction sites for al lcentral government projects is from a legal and sustainable source.Guidance on implementation is offered by the central point ofExpert ise for Timber Procurement (CpfD.tr

Prod uct certif ication/i nspection/testi n g

Users of this Bri t ish Standard are advised to consider the desirabi l i tyof th i rd- pa rty certif i cation/i nspecti o n/test i n g of p rod uct co nform itywith this Bri t ish standard. Users seeking assistance in identi fyingappropriate conformity assessment bodies or schemes may ask BSIto forward their enquir ies to the relevant associat ion.

Presentational conventions

The provisions of this standard are presented in roman (i .e. upright)type. l ts requirements are expressed in sentences in which thepr inc ipa l aux i l i a ry ve rb i s "sha l l " .

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1) Available at www.proforest.neUcpet.


Commentary, explanation and general informative material ispresented in smaller italic type, and does not constitute a normativeelement.

Contractual and legal considerations

This publ icat ion does not purport to include al l the necessaryprovisions of a contract. Users are responsible for i ts correctappl icat ion.

Compliance with a British Standard cannot confer immunity fromlegal obl igations.

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1 ScopeThis Brit ish Standard specif ies requirements for t imber scaffoldboards with a width of 225 mm and a thickness of either 38 mm or63 mm.

It covers board sizing, board construction, and t imber qual i ty andgrading, for which i t specif ies:

a) two grades for 38 mm thick scaffold boards, as fol lows:

1) 1 .2 m support centre - a grade that is su i table for support atcentres up to 1.2 m, which may be selected by visual ormachine st rength grading;

2) 1.5 m support centre - a grade that is suitable for support atcentres up to 1.5 m, which may only be selected by machinestrength grading.

b) a single grade for 63 mm thick scaffold boards that is suitable forsupport at centres up to 2.5 m, which may be selected by visualor machine st rength grading.

This Brit ish Standard does not cover laminated or f inger-jointedscaffold boards.

NOTE Annex A provides information on performance characteristics.Annex B provides information on support centres.

2 Normative referencesThe fol lowing referenced documents are indispensable for theapplication of this document. For dated references, only the edit ioncited applies. For undated references, the latest edit ion of thereferenced document ( inc luding any amendments) appl ies.

BS 1706, Method for specifying electroplated coatings of zinc andcadmium on iron and steel

BS 4978, Specification for visual strength grading of softwood

BS 6100-4, Glossary of building and civil engineering terms - Part 4:Forest products

BS 6338, Specification for chromate conversion coatings onelectroplated zinc and cadmium coatings

BS EN 10143, Continuously hot-dip coated stee/ sheet and strip -Tolerances on dimensions and shape

BS EN 13183-1 , Moisture content of a piece of sawn timber - Part 1:Determination by oven dry method

BS EN 13556, Round and sawn timber - Nomenclature of timbersused in Europe

3 Terms and definitionsFor the purposes of this Bri t ish standard, the nomenclature given inBS EN '13556, and the terms and def in i t ions g iven in BS 6100-4 andthe fo l lowing apply .

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3.1 scaffold boardboard intended to provide part of the support surface or platform inscaffolding when supported at appropriate centres and subjected toant ic ipated loadings

NOTE Alternative names include "scaffold plank" and "scaffoldbatten".

3.2 target spansupport centres for which the grading rules for the scaffold boardhave been developed

4 Types of timberTimbers for scaffold boards shall be selected from those specif ied inTable 1 or Table 2, as appropr iate.

Table 1 Timbers for machine grading of scaffold boards, for whichsettings have been derived

Standard name Botanical species Other common names

EuropeRedwood Pinus sylvestris European redwoodWhitewood Picea abies European whitewood

Abies alba European whitewood

Table 2 Timbers for visual grading of scaffold boards


EuropeRedwood Pinus sylvestris European redwoodWhitewood Picea abies European whitewood

Abies alba European whitewood

Canadian speciescombinationsDouglas fir - larch Pseudotsuga menziesii Douglas fir

Larix occidentalis Western larch

Hem - fir Tsuga heterophylla Western hemlockAbies amabi l is Amabi l is f i rAbies grandis Grand fir

Spruce - p ine - f i r Picea mariana Black sprucePicea engelmanni Engelmann spruce

Eastern Canadian sprucePicea rubens Red sprucePicea glauca White sprucePinus banksiana Jack pine

Pinus contorta Lodgepole pine

Pinus ponderosa Ponderosa pine

Abies lasiocarpa Alpine firAbies balsamea Balsam fir

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Pinus echinataPinus palustrisPinus elliottiiPinus taeda

38 +263 +3

225 +5225 +5

I t shal l be assumed that the th ickness and width of a board:

a) increase by 0.25% for every 1% of moisture content higher than20% up to 27Yo; and

b) decrease by 0.25o/o for every 1% of moisture content lower than20o/o.

A f inished scaffold board shal l be of the length described by thesupplier, with a tolerance of +25 mm, except in the case of boards ofbasic length greater than 3.9 m, for which the to lerance on lengthsha l l be +50 mm.

NOTE 1 lf more precise lengths than those specified are required forsystem (prefabricated) scaffolds, the tolerances should be those definedas acceptable by the scaffold manufacturer.

NOTE 2 Crosscutting is permissible as this does not affect the structuralintegrity of the board. For visually graded boards, all defects will havebeen visually assessed. For machine graded boards, the board will havebeen mechanically assessed along its length.

Construction

GeneralThe face surface shal l be sawn, edges shal l be sawn or planed, andcorners shal l be left square. Ends shal l be protected from spl i t t ing bythe use of either end bands (see 5.2) or nai lplates (see 6.3), f i t ted insuch a manner as to avoid causing in jury.

Table 2 Timbers for visual grading of scaffold boards (continued)


USASouthern yel low pine Short leaf p ine

Longleaf pine

Slash p ine

Lob lo l l y p ine

NOTE 1 The most commonly available timber is European whitewood.NOTE 2 This table lists those timbers known to be suitable for use forthe production of scaffold boards. No attempt has been made to listtimbers in such a manner as to indicate their relative strengths.

Dimensions and tolerancesBasic cross-sectional sizes, when measured at20o/o moisture contentin accordance wi th BS EN 13183-1, shal l conform to Table 3.

Table 3 Target cross-sectional sizes

Thicknessm m

widthm m

5.1

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G.z End bands

5.2.1 General

End bands shal l be so f in ished as to avoid causing in jury throughsharp ends.

6.2.2 38 mm thick boards

End bands shal l be made f rom z inc-coated mi ld s teel conforming toBS EN 10143,with a thickness of not less than 0.6 mm. The width ofthe end bands shal l be not lessthan 20 mm and not greater than theth ickness of the board. They shal l extend for a min imum of 150 mmalong the edge of the board.

The end bands shal l be secured to the edge of the board a long eachside wi th:

a) not fewer than two 30 mm x 3.0 mm clout nai ls , ga lvanizedin accordance with BS 1706 or zinc-plated and chromate-conversion-coated in accordance with BS 6338; or

b) not fewer than two 1.8 mm wire x 1 1.3 mm crown x 30 mm longstaples, galvanized to BS 6338 or made from stainless steel.

NOTE 1 When using stap/es to secure the end band to the board,the crowns of the staples should be fitted perpendicular to the edgeof the board.

The end bands shal l be secured to the end of the board wi th:

1) not fewer than three 30 mm x 3.0 mm clout nai ls , e i thergalvanized in accordance wi th BS 1706 or z inc-p lated andchromate-conversion-coated in accordance with BS 6338; or

2) not fewer than three 1.8 mm wire x 11.3 mm crown x 30 mmlong staples, galvanized to BS 6338 or made from stainless steel;o r

NOTE 2 When using stap/es to secure the end band to the board,the crowns of the staples should be fitted perpendicular to the endof the board.

3) not fewer than 28 teeth, stamped or pressed from the end bandin such a way that sharp str ips of steel are bent from the slots toproject at approximately 90' from the inner face of the band.

6.2.3 53 mm thick boards

End bands shal l be made f rom z inc-coated mi ld s teel conforming toBS EN 10143, with a thickness of not less than 0.6 mm. The width ofthe end bands shal l be not lessthan 47 mm and not greater than theth ickness of the board. They shal l extend for a min imum of 100 mmalong the edge of the board.

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The end bands shal l be secured to the edge of the board a long eachside wi th:

a) not fewer than two 30 mm x 3.0 mm clout nai ls, galvanizedin accordance with BS 1706 or zinc-plated and chromate-conversion-coated in accordance with BS 6338; or

b) not fewer than two 1.8 mm wire x 1 1.3 mm crown x 30 mm longstaples, galvanized to BS 6338 or made from stainless steel.

NOTE 1 When using stap/es to secure the end band to the board,the crowns of the stap/es should be fitted perpendicular to the edgeof the board.

The end bands shal l be secured to the end of the board with:

1) not fewer than three 30 mm x 3.0 mm clout nai ls , e i thergalvanized in accordance wi th BS 1706 or z inc-p lated andchromate-conversion-coated in accordance with BS 6338; or

2) not fewer than three 1.8 mm wire x 11.3 mm crown x 30 mmlong staples, galvanized to BS 6338 or made from stainless steel;or

NOTE 2 When using stap/es to secure the end band to the board,the crowns of the staples should be fitted perpendicular to the endof the board.

3) not fewer than 28 teeth, stamped or pressed from the end bandin such a way that sharp str ips of steel are bent from the slots toproject at approximately 90' from the inner face of the band.

G.3 NailplatesNai lp lates shal l be made f rom galvanized sheet s teel , by s tamping orpressing a pattern of slots so that sharp strips of steel are bent fromthe ends of the slots to project at approximately 90' from the innerface of the plate.

The plates shal l have a thickness of not less than 0.7 mm (22 gauge)with a width of not less than 27 mm and length of not less than1 9 0 m m .

There shall be not fewer than 42 teeth per plate and at least 50o/o ofthese teeth shal l have a length of not less than 8 mm. At least twoplates shal l be attached across each end of the board (one on eachface) and shal l be posi t ioned wi th in 230 mm of the end of the board.

The nai lplates shal l be attached by being pressed into the face of thescaffold board unti l the upper surface of the nai lplate is f lush withthat of the board. Before the nai lplate is inserted, pressure shal l beapplied to the edges of the board in order to close any f issures thatmight be present. The size l imits of f issures shal l conform to7.2.2.4.

7 Timber quality

7.1 GeneralTimber shal l be assessed in accordance with 7.2 or 7.3, as appropriate.

Both v isual and machine st rength grading operat ions shal l be carr iedout by a competent, adequately trained and supervised person.

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NOTE 1 lf testing of scaffold boards described as conforming to BS 2482is required to validate the grading, the method described in Annex Cshould be used. Under no circumstances should attempts be made toproof load scaffold boards intended for subsequent use, as such loadingmight seriously impair their strength.

NOTE 2 Minimum requirements of a factory production control systemare specified in Clause 8.

7.2 Visual grading of 38 mm thick, 1.2 m support spanboards and 63 mm thick boards

7.2.1 Methods of measurement

7 .2.1.1 Knots

NOTE Typical knots, and groups of knots, together with theirmeasurements are shown in Figures l a) to f).

Knots shal l be measured at r ight angles to the length of the board. lnthe case of the fol lowing types of knots, the dimension of the knotshal l be d isregarded.

a) For knots v is ib le on the edge but whose ax is is essent ia l lyperpendicular to the face, the d imension on the edge shal l bedisregarded [see Figure 1a) ] .

b) For a l l sp lay knots, the d imension of the knot on the face shal l beignored [see Figure 1c)].

Where more than one knot occurs wi th in any 100 mm length a longthe board, the knots shal l be considered as a group [see Figure 1f)] .

Subject to the exclusions specif ied in i tem a), each appearance ofevery knot on both edges shal l be measured and summed.

Subject to the exclusions specif ied in i tem b), each appearance ofevery knot on both faces shal l be measured and summed.

7.2.1.2 Characterist ics other than knots

Characterist ics other than knots shal l be measured in accordance withBS 4978.

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Figure 1 Typical knots and groups of knots

3

> l

t l

3/

t l

t l3

t l3

a) Face knots

Key

1 Measure at r ight angles to length

2 lgnore par t v is ib le on edge

3 Sum al l measurements shown

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Figure 1 Typical knots and groups of knots (continued)

b) Edge

Key

1 Sum

knots (visible on edges only)

a l l measurements shown

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c) Splay knots

Key

1 Only par ts v is ib le on edge measured

2 Sum both measurements

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1++ tT -,FNd) Arris knots

Key

1 Sum al l face measurements

2 Sum al l edge measurements

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e) Edge knots emerging on to face

Key

1 Measure on face separately

2 Measure on edge

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BS 2482:2009

7.2.2 Limiting characteristics

7.2.2.1 Rate of growth

The board shall be rejected if there are fewer than 5 growth rings per25 mm, when measured in accordance with Figure 2.

BRITISH STANDARD


f) Groups of knots

Key

1 More than one knot wi th in a

2 Sum al l measurements

100 mm length - consider as group

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Figure 2 Measurement of rate of growth

a) Measured through centre

Y = 2 5 m m

Z = 7 5 m m

b) Measured 25 mm from pith

7.2.2.2 Slope of grain

The board shal l be rejected i f the slope of grain exceeds 1 in 10 onthe face or on the edge (see Figure 3).

NOTE 1 Grain should run parallel to the face of the board.

NOTE 2 A scribe should be used when visually assessing the board forslope of grain.

Figure 3 Measurement of slope of grain

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7.2.2.3 Knots

The board shal l be rejected i f :

a) the measurement of any single knot on the face (except splayknots as excluded in 7.2.1.1) exceeds 75 mm;

b) the sum of knot measurements on both edges, noting theexclus ions of 7 .2.1.1, exceeds 28 mm for 38 mm th ick boards or35 mm for 63 mm thick boards;

c) the sum of knot measurements on both faces, noting theexclus ions of 7 .2.1.1, exceeds 150 mm.

Where knots or groups of knots of maximum size occur in more thanone posit ion, the board shal l be rejected unless there is at least150 mm of clear t imber between such occurrences.

7.2.2.4 Fissures and resin pockets

The board shal l be rejected i f f issures on either face, with a depthexceeding 12 mm, are longer than 225 mm.

Resin pockets shal l be assessed as f issures.

NOTE Unlimited minor surface checks are permitted.

7.2.2.5 Wane

The board shal l be rejected i f wane reduces the ful l edge dimensionby more than 12 mm and the face d imension by more than 25 mm,when measured in accordance with Figure 4. When end bands arefi t ted, wane shal l not extend on the edge such that the edge of theband is unsupported.

Figure 4 Measurement of wane

V , ( 2 5 m m

K , ( 1 2 m m

V r + V r ( 2 5 m m

Kr+ K , { 12 mm

Key

h Face of board

b Edge of board

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7.2.2.6 Distort ion

A board with a length of 3.9 m shall be rejected i f :

a) bow exceeds 12 mm;

b) spring exceeds 10 mm;

c) twist exceeds 12 mm over the ful l width of the board;

d) cup exceeds 5 mm.

For shorter board lengths, these l imits shal l be reduced in directproport ion to the rat io of the board length to 3.9 m.

NOTE The measurement of bow spring, twist and cup is shown inFigure 5.

Figure 5 Measurement of bow, spring, twist and cup for a 3.9 m board

a) Bow

b) Spr ing

EEr\

c) Twist

d) Cup

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7.2.2.7 Insect holes

The board shal l be rejected i f i t contains wormholes and wood waspholes or i f there is act ive infestat ion of the t imber.

7.2.2.8 Abnormal features

The board shal l be rejected i f i t contains reaction wood and otherabnormal features detr imental to strength.

7.2.2.9 Decay

The board shal l be free from fungal decay; however, blue stain insapwood is permissible.

7.2.2.10 Damage

The board shal l be rejected i f affected by damage that is l ikely tocause a greater reduction in strength than other admissiblecharacterist ics or that is l ikely to prejudice safe footholding or causein jury whi ls t handl ing.

7.3 Machine grading of boards

7.3.1 Methods of measurement

7.3.1.1 Mechanical ly assessed characterist ics

Excluding those characterist ics l imited by 7 -3.2.2, t imber qual i ty shal lbe measured by passing the board through a Cook Bolinder2),Computermat ic or Micromat ic3) s t rength grading machine. Thestrength grading machine shal l be operated, cal ibrated and servicedin accordance with the manufacturer 's recommendations.

7.3.1.2 Visual ly assessed characterist ics

The l imi t ing character is t ics speci f ied in7.3.2.2 shal l be measured inaccordance with BS 4978. Where visual assessment of knots isnecessary for mechanical ly assessed boards (see 7.3.2.2), suchknots shal l be measured in accordance wi th 7.2.1.1.

2) Cook Bo l inder i s a method o f mach ine s t rength grad ing and is the t radename of a product suppl ied by Techmach Ltd. This informat ion is given forthe convenience of users of th is standard and does not const i tute anendorsement by BSI of the product named. Equivalent products may beused i f they can be shown to lead to the same resul ts.

3) Computermat ic and Micromat ic are t rade marks owned by MPC Ltd, Uni t2, Tabrums lndustr ia l Estate, Batt lesbr idge, Essex SS11 7eX, and are thet rade names o f a p roduc tsupp l ied by MPC L td . Th is in fo rmat ion is g ivenfor the convenience of users of th is standard and does not const i tute anendorsement by BSI of the product named. Equivalent products may beused i f they can be shown to lead to the same resul ts.

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machine set to the5, as appropriate.

7.3.2 Limiting characteristics

7.3.2.1 Mechanically assessed characteristics

The board shall be accepted by a strength gradingl imit ing values speci f ied in ei ther Table 4 or Table

Table 4 Cook Bolinder grade settings

Target thickness Target span of boardm m m

Fixed deflection Loadm m k N

383863

1 . 21 . 52 .5

7 . 17 . 13 . 7

2 .213 .415.54

Table 5 Computermatic and Micromatic grade settings

Target thickness Target span of boardm m m

Fixed load Deflection l imitsN B i ts o f 0 .19 mm

3 0623 0628 505

7.3.2.2 Visually assessed characteristics

Over the ful l length of the board, characterist ics and defects shal lconform to7.2.2,4to7.2.2.10. In addi t ion, where a machine does notful ly grade to within 600 mm of both ends of a board, a visual checkfor knots shal l be made on the non-graded port ion. l f , upon assessingth is por t ion, i t is found to have a knot larger than the maximumpermi t ted in7.2.2.3, and i f such a knot is a lso larger than anyexist ing in the ful ly graded port ion, the board shal l be rejected.

8 Factory production controlA production control system shall be establ ished, documented andmainta ined to ensure that a l l products p laced on the market conformto the stated characterist ics. The system shall consist of documentedprocedures, with regular inspections and assessment to control theraw material, equipment and processes.

The system shall incorporate the fol lowing elements relat ing to thecontrol and supervision of the strength grading of scaffold boards.

a) A representative shal l be responsible for the operation of thegraders and shal l rev iew the grading records on a weekly basis .

b) Steps shal l be taken to ensure that rejected t imber is notre-graded and is stored separately from t imber conforming toBS 2482.

c) Graded t imber shal l be protected in storage and during transportto the extent necessary to minimize downgrading of the t imber.

533429

1 . 21 . 52 .5

383863

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BS 2482:2009

9

BRITISH STANDARD

d) The fol lowing records shal l be kept for each parcel of gradedt imber:

1) the job or order number;

2) the customer's name, i f known, or identi fying reference;

3) the t imber species or species combinat ion and i ts source;

4) t imber s ize and sur face f in ish (p laned or sawn);

5) the number of p ieces in each grade and the number ofrejects;

6) the date of grading;

7) the grader 's name or ident i f icat ion number;

8) the average moisture content;

9) the h ighest moisture content reading.

NOTE 1 When strength grading for stock or in a continuous process, therequirementto keep records as in items 1),2) and 5) may be modified.

NOTE 2 When recording the timber source in item 3), it is sufficient torecord the shipper's end mark, where this exists.

MarkingEach board shal l bear the fo l lowing in format ion, marked in a leg ib lemanner upon the means of end protection (see clause 6), upon aspecia l ly prov ided ident i f icat ion p late or by means of brands on thesurface of the board:

a) the number and year of this Bri t ish standard, i .e. BS24g2:20094);

b) the ident i f icat ion mark of the suppl ier ;

c) the le t ter M or V denot ing machine or v isual grading;

d) the word "support", fol lowed by the target span in metres up towhich the board may be suppor ted (see Table B.1) ;

e) where appropriate, the identi f icat ion mark of a third-partycert i f icat ion body.

4) Marking BS 2482:2009 on or in relation to a product represents amanufac turer ' s dec la ra t ion o f con formi ty , i .e . a c la im by or on beha l fof the manufacturer that the product meets the requirements of thes tandard . The accuracy o f the c la im is so le ly the c la imant 's respons ib i l i t y .Such a declarat ion is not to be confused with th i rd-party cert i f icat ion ofconformity.

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Annex A (informative) Properties of scaffold boardsScaffold boards conforming to this Bri t ish Standard would beexpected to provide the strength propert ies shown in Table A. '1.

Table A.1 Strength properties

Board thickness Target span working moment of resistance of am m m single board where:

An applied load An applied load isacts only on an spread uniformlyA)indiv idual board across a minimumkNm of 4 boards

k N m

38 1 .2 0 .50 0 .6138 1 .5 0 .65 0 .8153 2 .5 1 .25 1 .48NorE This data is based on a load of five days duration on a boardmeasured at 27% moisture content.A) For example , v ia a r ig id bu i ld ing produc t pack or s im i la r .

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Annex B (informative) SUppOft CgntfeS

The scaffold boards specif ied in this Bri t ish Standard are designed tooperate up to the target spans g iven in Table 8.1. However, ato lerance of +100 mm is a l lowed over th is span when set t ing outsupports. When correctly supported, the scaffold boards are designedto meet the loadings st ipulated by BS EN 1281 1 for scaffoldplatforms.

Table B.1 Target spans

Board typem m

Spanm

383863

'1.2

1 . 52 .5

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Annex c (informative) Method of test for determining bendingstrength

c.1 Sampl ingc. l .1 l f test ing ind iv idual boards, take any board, at a moisturecontent of 27% or greater.

C. '1.2lf test ing a batch of boards, take at least 20 boards, at amoisture content of 27o/o or greater.

c.z Procedu rePosi t ion the test specimen as a p lank over a span of 1.2 m for 38 mmthick boards or a span of 1.7 m for 63 mm boards, having p laced theboard's worst visual defect in the central half of the span. Supportthe specimen on rol lers and a f ixed knife edge reaction, or by otherdevices which achieve an acceptable free support condit ion withouts igni f icant local indentat ion of the specimen. Load the specimen asshown in F igure C.1, at a cont inuous rate adjusted so that maximumload is reached wi th in 300 +120 s, unt i l fa i lure occurs.

Repeat the test for each specimen.

NOTE The loading equipment used needs to be capable of measuringloads to an accuracy of 1% or better.

Figure C.1 Set-up for testing of scaffold boards

For 38 mm th ick boards, o = 0.3 m, L = 1 .2 m.For 63 mm th ick boards, a = 0.425 m, L = 1.1 m.

Key

a Distance from support to load point

F Total load applied to test specimen

L Span

@ BSI 2009 . 21


c.3 Expression of resultsCalculate the ult imate moment of each test specimen using thefo rmu la :

M r t t = 0 ' 5 x a x F r , ,

where:

a is the distance from support to load point, in m (seeF igure C . t ) ;

Mu* is the u l t imate moment of the board, in kNm;

Fu* is the maximum tota l load appl ied to the board, in kN.

c.4 Interpretation of resultsC.4.1An ind iv idual board conforming to one of the target spansgiven in this Bri t ish Standard would be expected to achieve therespect ive min imum ul t imate moment g iven in Table C.1, whentested in accordance with C.2.

C.4.2 A batch of boards conforming to one of the target spans givenin this Bri t ish Standard would be expected to:

a) have no more than 1 in 20 boards wi th an u l t imate moment lessthan the respective lower f i f th-percenti le ult imate moment giveni n T a b l e C . 1 ;

b) have no board with an ult imate moment less than the respectivemin imum u l t ima te moment g i ven in Tab le C .1 .

Table C.1 Ult imate moments to be achieved in load tests

Board Target span Lower fifth-percentile Minimum ultimatethickness m ultimate moment moment of anym m kNm board

kNm

38 1 .2 0 .903 8 1 . 5 1 . 3 053 2.5 2.50

0.771 . 1 92 . " 1 0

NOTE Eecause of the nature of timber and the factors affectingits performance, values of bending strength obtained by testing inaccordance with C.2 ought not to be used as design values withouttaking due account of various modifying factors. For instance, theduration of the test load is very much shorter than that likely to befound in actual use, and this is an important modifying influence.

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Bibliography

Standards publicationsFor dated references, only the edit ion cited applies. For undatedreferences, the latest edit ion of the referenced document ( includingany amendments) appl ies.

BS EN 12811 (all parts), Temporary works equipment

Other publications

t1l NATTONAL ACCESS AND SCAFFOLDTNG CONFEDERATION (NASC).A guide to good practice for scaffolding with tubes and fittings.TG20:08. London: NASC, 2008.

@ BSI 2009 . 23

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