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Disclosure to Promote the Right To Information
Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.
इंटरनेट मानक
“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda
“Invent a New India Using Knowledge”
“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru
“Step Out From the Old to the New”
“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan
“The Right to Information, The Right to Live”
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”
“Invent a New India Using Knowledge”
है”ह”ह
IS 15224 (2002): Laying of Plastic Translucent Sheets Madefrom Thermosetting Polyester Resin (Glass Fibre Reinforced)Alone or in Conjunction with Asbestos Cement Sheets/SteelSheets/Aluminium Sheets - Code of Practice [CED 5:Flooring, Wall Finishing and Roofing]
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IS 15224:2002
wRmm=ll-a’fhiRm
Indian Standard
LAYING OF PLASTIC TRANSLUCENT SHEETS MADEFROM THERMOSETTING POLYESTER RESIN(GLASS FIBRE REINFORCED) ALONE OR IN
CONJUNCTION WITH ASBESTOS CEMENT SHEETS/STEEL SHEETS/ALUMINIUM SHEETS —
CODE OF PRACTICE
ICS 83.140.10
0 BIS 2002
BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
December 2002 Price Group 8
\
Flooring, Wall Finishing and Roofing Sectional Committee, CED 5 ——
FOREWORD
This Indian Standard was adopted by the Bureau of Indian Standards after the draft finalized by Flooring,Wall Finishing and Rooting Sectional Committee had been approved by the Civil Engineering Division Council.
For providing structural surfaces exposed to weather, such as roofs of industrial, institutional, commercial,recreational and residential buildings as well as for providing daylight; plastic translucent sheets made fromthermosetting polyester resin (glass fibre reinforced) are laid either fully or partially (where the roofs are laidusing asbestos cement/steel/aluminium) in chequerboard or cover to ridge layouts in conjunction with asbestoscement sheets/steel/aluminium sheets.
This code covers recommendations for laying plastic translucent sheets made from thermosetting polyesterresin (glass fibre reinforced) conforming to IS 12866 either fully or partially in chequered or caves to ridgelayouts in conjunctions with reinforced corrugated asbestos cement sheets conforming to IS 459, corrugatedgalvanized steel sheets conforming to IS 277 or corrugated aluminium sheets conforming to IS 1254.
The composition of the Committee responsible for formulation of this standard is given at Annex B.
For the purpose of deciding whether a particular requirement of this standard is complied with, the final value,observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance withIS 2:1960 ‘Rules for rounding off numerical values (revised)’. The number of significant places retained inthe rounded off value should be the same as that of the specified value in this standard.
IS 15224:2002
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Indian Standard
LAYING OF PLASTIC TRANSLUCENT SHEETS MADEFROM THERMOSETTING POLYESTER RESIN(GLASS FIBRE REINFORCED) ALONE OR IN
CONJUNCTION WITH ASBESTOS CEMENT SHEETS/STEEL SHEETS/ALUMINIUM SHEETS —
CODE OF
1 SCOPE
This standard lays down the method of laying andfixing plastic translucent sheets made fromthermosetting polyester resin (glass tibre reinforced)either fully or partially in chequerboard or eaves toridge layouts in conjunction with corrugated asbestoscement/steel/aluminium sheets used as coverings forroofs and walls to provide daylight.
2 REFERENCES
The Indian Standards given at Annex A containprovisions which through reference in this text,constitute provision of this standard. At the time ofpublication, the editions indicated were valid. Allstandards are subject to revision, and parties toagreements based on this standard are encouraged toinvestigate the possibility of applying the most recentedition of the standards indicated at Annex A.
3 TERMINOLOGY
For the purpose of this standard, the followingdefinitions shall apply.
3.1 Abutment — Sloping intersection of a roof surfacewith a part of the structure which rises above it.
3.2 Accessories — Purpose made fittings such as ridgecapping, ridge finials, apron flashing pieces, eavesfiller pieces, barge boards, expansion pieces,ventilators, skylights and similar fittings, with whichthe roof is furnished.
3.3 Apron Flashing Piece — Flashing, the lower edgeof which is lapped over the roof covering.
3,4 Eaves — The lower edge of an inclined roof.
3.5 Eaves Filler or Closure Piece — Plastictranslucent accessory made from thermosettingpolyester resin (glass fibre reinforced) or asbestoscement/steel/aluminium accessory used to fill or closethe corrugation spaces under the roof sheeting at theeaves.
PRACTICE
3.6 Finial or Ridge End — Plastic translucentaccessory made from thermosetting polyester resin(glass fibre reinforced) or asbestos cement/steel/aluminium accessory to form waterproof covering atthe end of a ridge.
3.7 Gable — Part of a wall above the general eaveslevel at the end of a ridged or partially hipped roof.
3.8 Gutter — Any form of roof water channel.
3.9 Hip — Raking salient angle formed by theintersection of NO inclined roof surfaces.
3.10 Hip Ridge or Capping — Plastic translucentaccessory made from thermosetting polyester resin(glass fibre reinforced) or asbestos cement/steel/aluminium accessory used to form waterproof coveringto a hip.
3.11 Mitre — Cutting the joining surfaces of twosheets at an angle.
3.12 Pitch — Angle of inclination with the horizontalof the rafters or substructure surface on which the roofcovering is laid.
3.13 Ridge — Line of intersection of two inclinedroof surfaces at the apex of a roof.
3.14 Ridge Capping — Plastic translucent accessorymade from thermosetting polyester resin (gIass fibrereinforced) or asbestos cement/steel/a luminiumaccessory used to form a waterproof covering to aridge.
3.15 Valley — Re-entrant racking angle formed bythe intersection of two inclined roof surfaces.
3.16 Verge — Free edge of robf surface finishing at agable.
3.17 Daylight Factor — It is the unit of measureused in daylight design. This factor is the percentageof light which is available inside a buildingcompared to that simultaneously available out ofdoors.
IS 15224:2002
4 NECESSARY INFORMATION
4.1 For the efficient planning and execution of thework, detailed information with regard to the followingis necessary:
a) Roof area to be covered,
b) Required daylight factor,
c) Details of sub-structure of roof (to be designedbased on wind loadings),
d) Pitch of the roof, and
e) Location and size of openings and details ofroofing accessories.
4.2 All the information stated in 4.1 shall be madeavailable by the appropriate authority responsible forthe construction of the whole building to those whoare entrusted with the work of roof sheeting beforethe work is started. Necessary drawings andinstructions for preparatory work shall also be givenwhere required.
4.3 Arrangements shall also be made for the properexchange of information between those engaged inlaying the roof covering and all o@ers whose workwill affect or will be affected.
5 MATERIAL
5.1 Plastic Translucent Sheets
Plastic translucent sheets made from thermosettingpolyester resin (glass fibre reinforced) shall conformto IS 12866.
5.2 Fixing Accessories
Fixing accessories, such as hooked, cranked, ‘U’, ‘J’and square bend hook bolts, L-bolts, roof washers, etc,shall conform to IS 730.
5.2.1 Coach screws shall conform to IS 1120.
6 DESIGN CONSIDERATIONS
6.1 Plastic translucent sheet made from thermosettingpolyester resin (glass fibre reinforced) are laid eitherwholly or partially in chequerboard or eaves to ridgelayouts in conjunction with asbestos cement/steel/aluminium sheet used as covering for roofs and wallsto provide daylight. In order to obtain a structurallysound and permanent roof with adequate daylight andmaximum economy, the following requirements shallbe followed.
6.1.1 Roof Plan
The roof plan shall be as simple as possible. Formationof hips and valleys should be avoided as far as possible.Isolated projections above roof should be avoided atthe design stage itself, as it is difficult to make the
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junctions between such projections and the roofsheeting weatherproof.
6.1.2 Pitch of the Roof—.. . --- . . . .. . .I’he pitch or roors shall, wherever possible, bepreferably not less than 18°. Should it however befound desirable to adopt roofs with a pitch less than18°, the values prescribed in 6.1.6 for the end lapsbetween adjacent sheets shall be correspondinglyincreased and/or the joints suitably sealed inaccordance with the manufacturers recommendationsor the instructions of the engineer-in-charge.
6.1.3 Purlins/Rails
All purlins/rails shall be in one plane and shall beproperly anchored to the supporting structure. Specialcare shall be taken that the sheets do not deflect at theintermediate purlinshils in an attempt to make thesheets bear on such purlinshails.
6.1.3.1 When plastic translucent sheets made fromthermosetting polyester resin are laid wholly forproviding roofs of industrial, institutional,commercial, recreational and residential buildings, itis not practical to give standard support centres andfixing specifications since wind loads are likely to varyfrom location to location. Factors which should beconsidered when determining support centres andfixing specifications are:
a) Sheets should not pull over fasteners whensubjected to high wind gusts.
b) Deflections between supports caused by highwind gusts should be limited to span/15 andnever more than 100 mm to prevent fixingholes ovalling and tearing around fasteners.
c) When subjected to superimposed loads;deflections should be limited to span/30 andnot more than 50 mm to prevent laps openingand damaging sealants.
However, the maximum recommended support centresof different profile depth plastic translucent sheetsmade from thermosetting polyester resin (glass fibrereinforced) conforming to IS 12866 are given inTable 1.
6.1.3.2 Spacing of purlins/rails
While fixing plastic translucent sheets made fromthermosetting polyester resin (glass fibre reinforced)in conjunction with asbestos cementlsteel/aluminiumsheets in chequerboard or eaves to ridge layouts, thespacing of purlins/rails shall be arranged to suit thestandard lengths of sheets but shall not exceed themaximum recommended purlins/rails centre asdescribed in Table 2.
2
IS 15224:2002-.
Table 1 Maximum Recommended Purlin/RailCentre for Laying Roof Fully with Plastic
Translucent Sheets Made from ThermosettingPolyester Resin (Glass Fibre Reinforced)
(Clause 6.1.3.1)
All dimensions in millimetres.
Type of ProtileSheets No.
(1) (2)Corrugatedasbestos cement
1
1profile in2
accordance withIs 459Corrugatedsteel profile in
1
3accordance with 4IS 277Corrugatedaluminium
}
5sheet profile in 6accordance with 7[S 1254
Depth of Pitch of MaximumCorruga- Corruga- Recommended
tion tion Purlin/RailCentres
(3) (4) (5)
48 1462250
45 3382250
17.5 75 125012.5 75 1250
19 75 125038 125 225038 190 2250
Table 2 Maximum Recommended PurIin/RailCentre for Fixing Plastic Translucent Sheets
Made from Thermosetting Resin (Glass FibreReinforced) Partially in Chequerboard or Eavesto Ridge Layouts in Conjunction with Asbestos
Cement/SteeUAluminium Sheets
(Clause 6.1.3.2)
All dimensions in millimeters.
Type of Profile Depth ofSheets No. Corruga-
tion
(1)Corrugatedasbestos cementprofile inaccordancewith 1S459
Corrugated steelprofile inaccordance withIS 277
Corrugatedaluminiumsheet profile inAccordancewith IS 1254
(2) (3)
1 482 45
3 17.54 12.5
5 196 387 38
Pitch ofCorruga-
tion
(4)
146338
7575
75125190
MaximumRecommended
Purlin/RailCentres
(5)
24502450
13751375
137524502450
6.1.3.3 When a roof is being laid totally with plastictranslucent sheets made from thermosetting polyesterresin (glass fibre reinforced); the ridge purlins shallbe so fixed from the apex of the roof that main sheetfixings should not be located less than 50 mm fromends of sheets. Whenever plastic translucent sheetsmade from tbermosetting polyester resin (glass fibrereinforced) are laid in conjunction with asbestoscement/steeUaluminium sheets in chequerboard oreaves to ridge layouts, ridge purlins shall be fixed atthe same distance from the apex of the roof as governedby the respective code of practice for laying asbestoscement/steel/aluminium sheets.
6.1.4 Whenever a roof is being laid either by usingplastic translucent sheets made from thermosettingpolyester resin (glass fibre reinforced) fully or by usingthem in conjunction with asbestos cement/steel/aluminium sheet either in chequerboard or eaves toridge layouts, additional trimmers or bridging shaJlbe used between purlins at all points whereconsiderable roof traftlc is likely to occur, for example,adjoining valley or box gutters, below glazing andaround chimneys, ventilators or other uptakes.Similarly, when a course of sheets of smaller length isrequired to make up a roof slope, the closer purlinspacing necessary for to make up a roof slope, thecloser purlin spacing necessary for such sheets shouldbe arranged at eaves rather than at edges, as this willbring additional support where it is most required.
6.1.5 Hip and valley runners provided should be fixedflush with the top face of purlins and spanning betweenthem to give adequate support to the raking cut edgesof roof sheets at hips and valleys. The runners shouldrun parallel to the edge of the sheeting and placed soas to permit the fixing of the sheets and hip coveringaccessories.
6.1.6 Laps
The plastic translucent sheets made fromthermosetting polyester resin (glass fibre reinforced)while laid fully, shall be with a side lap of onecorrugation (see Fig. 1 and 2). Side laps of plastictranslucent sheets made from thermosetting polyesterresin (glass fibre reinforced) when laid in conjunctionwith asbestos cement/steel/aluminium sheets inchequerboard or eaves to ridge layouts, shall begoverned by the respective code of practice for layingasbestos cement/steeUaluminium sheets. When plastictranslucent sheets made from thermosetting polyesterresin (glass ftbre reinforced) are laid either fully or inconjunction with asbestos cement/steel/al uminiumsheets on roof pitches above 10°, the side laps shall bestitch (seam) bolted at certtres not exceeding 400 mmwhile on roof pitches below 10°, the centres shall bereduced to 300 mm, For normal roof pitches (that is,
3
IS 15224:2002
inclinations greater than or equal to 180), the end laps(see Fig. 3) of plastic translucent sheets made fromthermosetting polyester resin (glass fibre reinforced)with each other or with asbestos cement/steeValuminium sheets shall not be less than 150 mm. Forlow roof pitches (that is inclinations less than 18°) orfor normal pitched roof in exposed positions, the endlaps shall be increased and the manufacturer shall beconsulted in such cases. The side lap shall as far aspossible, be sheltered from the prevailing winddirection. Side and end laps or plastic translucentsheets made from thermosetting polyester resin (glasstibre reinforced) between themselves or between themand asbestos cement/steel aluminium sheets shallalways be sealed on roof pitches up to 18° using masticsealant ensuring that sealant is correctly bedded intounderlapping corrugation before laying over sheets.Plastic translucent sheets made from thermosettingpolyester resin (glass fibre reinforced) shall notoverhang supports at eaves (measured as the lengthof sheet from its lower edge to the centre of bolt holes)by more than 230 mm.
6.1.6.1 While laying roof fully with plastic translucentsheets made from thermosetting polyester resin (glassfibre reinforced), wherever four corners of sheetsoverlap, two of them shall be mitred in the mannerdescribed in Fig. 4, in order to secure a perfect fit.While plastic translucent sheets made fromthermosetting polyester resin are laid in conjunctionwith asbestos cement/steel/aluminium sheets inchequerboard or eaves to ridge layouts, wherever
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corners of plastic translucent sheets overlap withasbestos cement/steel/aluminium sheets, they shouldbe mitred in the same fashion as required and laiddown in the respective code of practice for layingasbestos cement/steel/aluminium sheets.
7 LAYING AND FIXING OF SHEETS
7.1 Sawing and Drillings
7.1.1 Plastic translucent sheets made fromthermosetting polyester resin (glass fibre reinforced)shall be cut as necessary with a hacksaw with 6/8 teethper centimeter. Best results are obtained if saw is heldat a shallow oblique angle. When cutting with powertools, a 40/60 grit diamond blade operating at mediumspeed (280 surface m/min) shall be used. Sheets shallbe notched using standard metal working snips. Holesin the sheets shall be drilled with standard metal bits.Holes shall not be punched. On sinusoidal profiles,holes shall always be drilled through the crown of thecorrugation and not on the valley.
7.1.2 While plastic translucent sheets made fromthermosetting polyester resin (glass tibre reinforced)are laid either fully or in conjunction with asbestoscement/steel/aluminium sheets in chequerboard oreaves to ridge layouts, for end laps, holes in the plastictranslucent sheets made from thermosetting polyesterresin (glass fibre reinforced) shall be drilled at adistance not less than 100 mm from the edge to suitthe purlins, that is, on the centre line of the purlins ifthese are of timber and square head coach screws are
J-TYPE HOOK BOLT7BITUMINOUSFELT WASHER GI FLAT WASHER
A~
I I
I
FIG. 1 TYPICALSIDE LAP OF PLASTICTRANSLUCENTSHEETS— CORRUGATEDPROFILE
4
IS 15224:2002
SCREW WITH BITUMINOUSFELT WASHER, GI FLAT WASHERAND G. I NUT
\GI FLAT
BITUMINOUSFELT WASHER
L .
‘SELF-TAPPINGSCREW
FIG. 2 TYPICALSIDE LAP OFPLASTICTRANSLUCENTSHEETSTROUGHEDPROFILE
GI FWAS
STICNSLUCENT
MS
SHEET
FIG. 3 DETAILOF END LAP
\\
IS 15224:2002
V-
RIDGE1
—SIDE LAP
1Ii
tI
I
III
II1II
:II31
EAVES
1END LAP
– MITRE
1 I-~
4 —
‘-A
---
~“,,E,> ‘PURLIN POSITION TOSUIT OVERHANG TO
,4= Uncut sheetB =Top left-hand corner cutC= Bottom right-hand corner cutD= Top left hand corner and trottom right-hand corner cut
FIG. 4 LAYINGOF SHEETS(SHEETSLAID FROMLEFT TO RIGHT)
used, or as close as possible to the back of the purlinsif J- or L-bolts are used with steel angles or precastconcrete or timber purlins. It is therefore,recommended to drill the holes on the roof with thesheeting laid in the correct position. No hole shall benearer than 50 mm to any edge of a plastic translucentsheet made from thermosetting polyester resin (glassfibre reinforced).
7.2 Fixing Accessories
efficiency of fixing accessories. The area of sheetingunder the adjacent to a fixing washer is where mostfailures originate. The diameter of the washer is thusimportant. Also if fasteners are not fixed ‘square on’to the sheets and washers are out of register, washeredges can impart a quilloting action on sheets causingfailure at lower loads. Thus it is recommended toconsider the factors specified in 7.2.1.1 to 7.2.1.3 whiledetermining support centres and fixing specificationsas well as accessories.
7.2.1 The satisfactory service of a roof largely depends 7.2.1.1 Sheets shall not pull over fasteners whenupon determining the correct support centre and subjected to high wind loads.
6
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7.2.1.2 Deflections between supports caused by highwind gusts shall be limited to prevent fixing holesovalling and tearing around fasteners.
7.2.1.3 Deflections shall be limited against sustainedsnow loads to prevent laps opening and damagingsealants.
7.2.2 Galvanized iron J- type hook bolts or crankedhook bolts, and nuts bearing on galvanized ironwashers and bitumen washers shall be used for fixingsheets on angle iron purlins.
7.2.3 Galvanized iron L- type hook bolts and nutsbearing on galvanized iron washers and bitumenwashers shall be used for fixing sheets on R.S. joist,precast concrete or timber purlins.
7.2.4 Galvanized iron coach screws bearing ongalvanized iron washers and bitumen washers shallbe used for fixing sheets on timber purlins.
7.2.5 Cadmium plated or stainless steel self-lappingscrew bearing on cadmium plated or stainless steelwashers and bitumen washers shall be used for fixingtrough section profiles directly to the supportingstructures through bottom flat troughs of sheets.
7.2.6 Galvanized iron roof bolts and nuts bearing ongalvanized iron flat washer and bitumen washers shallbe used for stitching on the sheets, fixtures like ridgecapping, comer pieces, ventilators, north light curves,etc.
IS 15224:2002
7.2.7 Where sheets are laid on tubular purlins, thefixing bolt should be designed to encompass at leasthalf the tube periphery and precaution should be takento prevent its rotation. Sections other than angles andtubes may require an adapted form of hook bolt.
7.2.8 It is essential that the bolt holes are madewatertight by the use of bituminous felt washers inconjunction with suitable galvanized iron washers.These form essential accessories to good fixing work.Fixing bolts and screw shall be 8 mm or more indiameter and the nuts of the hook crank bolts (or headsof coach screws) shall bear on galvanized iron washers(flat, curved or diamond pattern) which, in turn, shallbe embedded on bituminous felt washers (round ordiamond pattern corresponding to the shape ofgalvanized iron washer). The screws or nut shall betightened sufficiently only to seat the bitumen washerover the corrugations, so that natural movement inthe substructure of the roof may not damage thesheeting.
7.2.9 While laying plastic translucent sheets madefrom thermosetting polyester resin (glass fibrereinforced) of different profiles conforming toIS 12866, the number and length of J- bolts or crankbolts shall be as given in Table 3.
7.2.10 Number of galvanized iron roof bolts andnumber of bitumen and galvanized iron washersrequired for stitching the side laps of plastic
Table 3 Number and Length of Bolts and Number of B~tuminous Felt and Galvanized Iron Washers
(CLzuse 7,2.9)
Situation
(1)
At horizontal (end) laps ofsheet. At eaves when tillerpieces are used. At ridgewhen cornrgated sheets andridge pieces arc secured bythe same bolt
Type of Sheet
(2)
Corrugated asbestos cementprofile in accordance withIs 459
Corrugated steel profile inaccordance with IS 277
Corrugated aluminiumsheets profile in accordancewith IS 1254
Profile No. Overall No. of Bolts andWidth Bituminous
Washers andGalvanized Iron
Washers
(3) (4) (5)
1 1050 Three times thenumber of sheetsin one horizontalcourse
3 660 Three times thenumber of sheetsin one horizontalcourse
5 650 Three times thenumber of sheetsin one horizontalcourse
800 Four times thenumber of sheetain one horizontalcourse
Length of Bolt
(6)
Depth of purlinplus 90 mm
Depth of purlinplus 65 mm
Depth of purlinplus 65 mm
Depth of purlinphlS 65 nun
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7
\‘.,
IS 15224:2002
translucent sheets shall be in accordance with 6.1.6.Where plastic translucent sheets are laid in conjunctionwith asbestos cement/steel/aluminium sheets inchequerboard or eaves to ridge layouts, the number ofgalvanized iron bolts and number of bitumen andgalvanized iron washers required for stitching the sidelaps shall be governed by the respective code ofpractice for asbestos cement/steel/aluminium sheets.
7.2.11 The galvanized iron flat washer shall generallybe 29 mm in diameter and 1.6 mm thick with hole tosuit the required size of fixing accessory. The bitumenwasher shall be 40 mm in diameter and 1.5 mm thickwith hole to suit the required size of fixing accessory.For other shapes of galvanized iron and bitumenwashers, suitable sizes as approved by the engineer-in-charge may be used.
7.2.12 Ridge cappings shall, as far as possible, besecured to the ridge purlins by the same bolts whichsecure the sheeting. Other plastic translucentaccessories such as barge boards, eaves filler piecesand apron flashing pieces shall be secured either tothe supporting structure or to the sheeting by rootingbolts.
7.3 Laying the Sheets
7.3.1 When plastic translucent sheets made fromtherrnosetting polyester resin (glass fibre reinforced)are laid either fully or in chequerboard or eaves toridge layouts in conjunction with asbestos cementisteellaluminium sheets, before the actual laying ofsheets are started, the purlin spacing and the lengthof the sheets shall be checked to ensure that thearrangement will provide the laps required and thespecified overhang at the eaves.
7.3.2 When plastic translucent sheets made fromthermosetting polyester resin (glass fibre reinforced)are laid in conjunction with asbestos cementfsteellaluminium sheets in chequerboard or eaves to ridgelayouts, the required total number ofplastic translucentsheets shall be distributed over the entire roof area atequal pitch to ensure even daylight.
7.3.3 When the roof of a building is laid fully withplastic translucent sheets, the side of end laps of thesheets shall be in accordance with 6.1.6, When theroof of building is laid using plastic translucent sheetsin conjunction with asbestos cement/steel/aluminiumsheets in chequerboard or eaves to ridge layouts, theside and end laps of plastic translucent sheet withasbestos cement/steel/aluminium sheets shall begoverned by the respective code of practice for layingasbestos cement/steel/aluminium sheets. In either case,the course of sheets shall be so laid that thecorrugations run in continuous straight lines.
7.3.4 When a building in an exposed position andsubject to driving winds and rains is being laid fullywith plastic translucent sheets, it is advisable tocommence laying the sheets from the end opposite tothe direction of prevailing winds. When a building inan exposed position and subject to driving winds andrains is being laid with plastic translucent sheets inconjunction with asbestos cement/steel/aluminiumsheets in chequerboard or eaves to ridge layouts, thelaying of sheets should commence in the way asgoverned by the respective code of practice for layingasbestos cement/steel/aluminium sheets.
7.3.5 When the roof of a building is being fully laidwith plastic translucent sheets, they shall start at theeaves either from left to right or from right to leftdepending upon the prevailing direction of the wind.If laid from left to right (see Fig. 4), the first sheetshall be laid uncut, but the remaining sheets in thebottom row shall have the top left-hand corners cut ormitred. The sheets in the second and otherintermediate rows shall have the bottom right-handcomer of the first sheet cut, all other sheets except thelast sheet shall have both the bottom right hand comerand top left hand comer cut the last sheet shall haveonly the top left hand comer cut. The last or the toprow sheets shall all have the bottom right hand comercut with the exception of the last sheet which shall belaid uncut. If the sheets are laid from right to left, thefirst sheet shall be laid uncut and the remainingprocedure shall be reversed. When plastic translucentsheets are laid in conjunction with asbestos cementisteel/ahuninium sheets in chequerboard or eaves toridge layouts, the procedure of laying the sheets shallbe governed by the respective code of practice forlaying asbestos cement/steel/aluminium sheets.
7.3.6 The mitre described in 7.3.5 is necessary toprovide a snug tit where four sheets meet at a lap. It iscut from a point minimum 15 cm (or whatever thelength of the end lap may be) up the vertical side ofthe sheet to a point 4.5 cm along the horizontal edge.This cutting shall be done with 6/8 teeth per cm atsite.
7.3.7 When a roof is being fully laid with plastictranslucent sheets, the end of sheets at the eaves shallbe supported and the support shall be placed as nearto the margin of the sheets as practicable. Themaximum free overhang at the eaves shall be not morethan the limits specified in 6.1.6. When plastictranslucent sheets are laid in conjunction with asbestoscement/steel/aluminium sheets in chequerboard oreaves to ridge layouts, the maximum free overhang atthe eaves shall be governed by the respective code ofpractice for laying asbestos cement/steel/aluminiumsheets. I
8
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7.3.8 When a roof is being fully laid with plastictranslucent sheets for sinusoidal profile plastictranslucent sheets, fixings should be located throughthe crowns of the sheets. Trough section profile plastictranslucent sheets should be fixed direct to thesupporting structure with cadmium plated or stainlesssteel self tapping screws located in the bottom flattroughs of sheets, nuts or screws shall be tightenedlightly at first, and then fully tightened when a dozenor more sheets have been laid. On no account shallthe fixing screws or the nuts on fixing bolts be screweddown too tightly, and care shall be taken not to deflectsheets at the intermediate purlins in an attempt to makethe sheets bear on such purlins. When sinusoidalprofile plastic translucent sheets over 25 mm deep arefixed through the crowns, it is essential that shapedpacking pieces are located between the sheet andsupporting members to enable fixings to be correctlytightened without distorting the sheet profile.
8 FIXING OF ACCESSORIES
8.1 General
When a roof is being fully laid with plastic translucentsheets, required moulded plastic translucentaccessories should be selected as far as possible fromthe range of standard patterns. Special plastictranslucent fittings, if required, should be designed toconform closely to the sheet profile. When the use ofmoulded plastic translucent accessories isimpracticable, other methods as approved by theengineer-in-charge may be employed. When a roof isbeing laid with plastic translucent sheets inconjunction with asbestos cement/steel/aluminiumsheets in chequerboard or eaves to ridge layouts, theselection and fixing of asbestos cement/steel/
IS 15224:2002
aluminium accessories shall be governed by therespective code of practice for laying asbestos cementisteel/aluminium sheets.
8.1.1 Plastic translucent roofing accessories shouldbe secured to the roof as far as possible, by the samebolts which secure the sheets.
8.2 Ridge Capping
Plastic translucent ridge capping should be secured tothe ridge purlins as far as possible by the same boltswhich secure the sheets. Where this is not possible,each wing of the ridge capping should be adequatelysecured to the sheets by roofing bolts.
8.2.1 Close Fitting Adjustable Ridge Capping
The plastic translucent close fitting adjustable ridgecapping shall be designed to fit the corrugations ofstandard plastic translucent corrugated sheets laid witha side lap of one corrugation, and shall be securedwith the fixing accessories used to fasten the sheets tothe ridge purlins (see Fig. 5). Correct positioning ofplastic translucent sheets is necessary, and Fig. 6illustrates how to fit each wing of the ridge when sheetsare laid either from left to right or from right to left.Correct fitting ofplastic translucent ridge capping willbe automatic, if a template is used when fixing theplastic translucent roofing sheets.
8.2.1.1 While fitting plastic translucent close fittingadjustable ridge capping, the work shall be started fromthe left hand verge, placing first small roll wing (inner)and positioning it in such a way that the first valleyon the right hand side of the ridge wing fits into thevalley at side lap of roof sheeting. It may be necessaryto leave a piece of ridge project beyond the verge whilstfitting and cut off the unrequited portion afterwards.
—
FIG. 5 TYPICALCLOSEFITTINGADJUSTABLERIDGE
9
LARGE ENDSMALL END
\
*J
---- --. —------ -- —-- .----
~ b. ,.; ~.
I I *+-=%%* I
/
LSIDE LAP \ SMALL VALLEYOF SHEETS OF RIDGE
POSITION OF SMALL INNERWING ON SHEETS LAID
RIGHT TO LEFT
LARGE ENDSMALL END
I
$!!?5?/
—-———---—_ _. --- -----—---
:/-,/ . / -.\\.
I‘.\
\Tx, .’\\\=_#~’“.:.’
‘SM.#LR:;~Ey klDE LAPOF SHEETS
POSITION OF SMALL INNERWING ON SHEETS LAID
LEFT TO RIGHT
TEMPLATE FOR CORRECT GAUGINGOF CORRUGATED SHEET SIDE LAP
SMALL ENDrLARGE END ~
POSITION OF LARGE OUTERWING ON SHEETS LAID
RIGHT TO LEFT
SMALL END~LARGE END
\
+’k==+===+!.-.
-1T-?7!“- .\; /“- -’,’\\\ ,. .,.\ ,y+--+. I ‘ -J’-l’
/’SMALL VALLEY1
SIDE LAPOF RIDGE OF SHEETS
POSITION OF LARGE OUTERWING ON SHEETS LAID
LEFT TO RIGHT
SSMALL VALLEy
LARGE OUTER WING
SMALL VALLEY
SMALL INNER WING
f
RIDGE (LARGEOUTER WING)
FIXING OFADJUSTABLE
RIDGE PIECES
FIG. 6DHTAILS SHOWINGMETHODOF FIXINGCLOSEFITTINGADJUSTABLERIDGEPIECES
In the case of a large roll wing, the wing shall bepositioned so that the first valley on the left hand sideof the ridge wing fits into the valley at the side lap ofthe roof sheeting. The ridge wing shall be trimmed atverge to suit requirements.
8.2.2 Serrated Adjustable Ridge Capping
Plastic translucent serrated adjustable type ridgecapping are supplied in pairs; the inner and outerbeing made easily distinguishable (see Fig. 7 and 8).These ridges have certain serrations suitably paintedfor distinction and, when fixing, these serrationsshall be arranged at side lap joints of the sheets, inwhich case the stagger-lapping of the two wings ofthis ridge will be automatic. Figure 8A indicatesthe method of laying and fixing these ridges.
8.3 Ridge Finial
One-piece plastic translucent ridge finial should besecured by one roofing bolt through the crown. Two-piece ridge finial should be secured to the ridgecapping and roof sheeting by one bolt through eachwing of the fitting. In addition, they should be securedto the ridge capping by one roofing bolt at the crown(see Fig. 9).
8.4 Hip Capping or Hip Tiles
The plastic translucent roof sheeting at hips shouldbe cut to the required mitre and be close butted. Thehip joint may be covered with plastic translucent two-piece plain wing hip tiles (see Fig. 10), one-piecesocketed plain wing angular hip tiles, or heavy half-
IS 15224:2002
round hip tiles. Alternatively, an apron type of plastictranslucent capping may be used for scribing on site,over the corrugations. Where the sub structure is ofmetal or concrete, the plain wing ridge should besecured through the roof sheets to the hip runners byone bolt on each side immediately above the socket.Each half-round hip tile should be secured with asingle bolt at the centre, the bolt being secured at itslower end by a metal bridging plate whose ends bearon the underside of the sheeting. On a timber roof,the hip tile should be fixed to the rafter by means ofcoach screws.
8.5 Eaves, Verges and Gable Ends
Plastic translucent accessories may be used to closethe corrugation at eaves (see Fig. 11) and at the bottomof vertical sheeting. Alternatively, plastic translucentsheeting at the eaves may be bedded in mortar if thewalls of the building are of brick, block or similarconstruction.
8.6 Top Edges and Abutments
At top edges against walling, plastic translucent apronflashing pieces should generally be used (see Fig. 12).If the wall consists of vertical sheeting, it should lapover the upstand of the flashing piece and the apronshould lap over the roof sheeting; no metal flashing isrequired. If, however, the wall is of brick or masonry,the apron should be secured to the sheeting and metalor felt cover flashing should be used over the upstandof the flashing piece.
At a sloping abutment, if the direction of the
‘TIP PAINTED BLACKTO FACILITATE FIXING
FIG. 7 TYPICALSERRATEDADJUSTABLERIDOES
11
. _
IS 15224:2002
—
THIS PORTION OFr ASERRATION SUITABLYINNER WING OF PAINTED ON RIDGESRIDGE TO BETRIMMED OFF
TO FIT IN CORRUGATIONSWHERE SHEETS OVERLAP
i
THIS PORTION OF OUTER WING1OF RIDGE TO BE TRIMMED OFF
J-T
INNER WINGOF RIDGE= A
“Y%;*ETS
FIG. 8 DETAILSSHOWINGFIXINGOF SERRATEDADJUSTABLERIDGES(SHEETSLAID FROMLEFT TORIGHT)
corrugations is parallel to or running away from thewall face, metal or felt flashings may be used. Theflashing should be dressed as an apron over the roofsheeting to cover atleast the first full corrugation ofthe sheeting and should be not less than 150 mm wide.The upstand should be provided with cover flashingsor should be turned into and secured to the wall. If thecorrugations run into the wall face, the edge of thesheeting should be kept back atleast 125 mm clear ofthe wall face and a suitable gutter should be provided.
8.7 Ventilators
When a roof is being laid fully with plastic translucentsheets, permanent ventilation through roofs may beaffected by the use of specially purpose built mouldedplastic translucent accessories which includecontinuous ridge ventilators, wing type ventilatingridge capping louver, louver ventilators, purpose madeventilators and extractors (see Fig. 13).
Alternatively, if a wide continuous ventilating space
12
Is 15224:2002
-m ITFD WING
GND
INNER W
J-TYPE HOOK B
GL
“- .-. - .....’... ,:, ,.. ., .. ,. . .. . . .. ...
Fm. 8A TYPICALNORTHLIGHTTWO-PIECEADJUSTABLERIDGE
J-TYPEHOOK
ELEVATlON(BARGE BOARD REMOVED)
FIG. 9 TYPICALRIDGEFINAL
13
\
IS 15224:2002
NOTE - Serrations, as desired, shotdd be cut at site to tit corrugations at hip slopes.
FIG. 10 TYPICALUNDERRATEDADJUSTABLERIDGEFORHIPS
FIG. 11 TYPICALEAVESFILLERPIECE
at the ridge is required, the normal type of ridgecapping may be omitted, the upper course of plastictranslucent roof sheets on each slope may have up-turned ends and the gap at the ridge may be roofedover at a higher level with segmental or down-curvedsheets.
When plastic translucent sheets are laid in conjunctionwith asbestos cement/steel/aluminium sheets in
chequerboard or eaves to ridge layouts, permanentventilation through roofs may be affected by the useof such specially motdded-fabricated asbestos cementisteel/aluminium accessories as described in therespective code of practice for laying asbestos cementtsteel/ahuninium sheets.
8.8 Other plastic translucent accessories such as comerrolls and barge boards (see Fig. 14) should be secured
14
IS 15224:2002
J-TYFEH60i” iOLT
%
7I_
ISIDE CLADDING I
I
i
APRON PIECE n~
LEAN-TO ROOF>
I
I
I
74-
STANCHIONJ
FIG. 12 CORRUGATEDAPRONPIECE
either to the structure or to the sheeting with the helpof roofing bolts.
9 GUTTERS AND RAIN-WATER PIPES
9.1 Gutters and rain water pipes shall be fixed inaccordance with the recommendations of relevantIndian StandardfCode of practice.
10 STORAGE AT SITE
10.1 All plastic translucent sheets made fromthermosetting polyester resin (glass fibre reinforced)shall be stored on flat clean battens laid on firm levelground at centres not exceeding 1500 mm. Stackheights should not exceed 1000 mm.
10.2 Plastic translucent sheets made fromthermosetting polyester resin (glass fibre reinforced)shall be protected from wind against being blown away
15
and mechanical damage. When stored in open, theyshould always be covered with water-proof covers.Otherwise, the sun’s rays passing through layers oftranslucent sheets act as a ‘solar battery’, boiling anyentrapped moisture, and this can discolour sheets.
11 HANDLING AND SAFETY PRECAUTIONS
11.1 When handling long lengths of plastictranslucent sheets made from thermosetting polyesterresin (glass fibre reinforced), several sheets nestedtogether shall be carried with a man supporting sheetsevery 3000 mm to prevent breakage. Single sheetscan be carried by rolling sheets across their width toform a cylinder, and roping at 1500 mm interval.
11.2 Walking on plastic translucent sheets made fromthermosetting polyester resin (glass fibre reinforced)shall not be allowed. Crawling boards/roof boards mustbe used by men working on the roofs.
1S 15224:2002
COWLVENT
MUSHROO
s
‘MUSHROOM HEADROOFIIW BOLT
PLAN
FIG. 13 TYPICALCORRUGATEDCOWLTYPEVENTILATOR
~100mm LAP
BASHHE
:!’
v-BARGE BOARD AT VERGEOF THE ROOF
—
ANGLE PURLIN
MS ANGLEPLJRLIN
FIG. 14 TYPICALDETAILSOFBARGEBOARDORCORNER(VIEW FROMEAVES)
16
IS 15224:2002—
11.3 All othef safety precautions shall be observed inaccordance with the provisions laid down in therespective codes of practice for laying asbestos cementlsteel/aluminium sheets.
12 CLEANING AND MAINTENANCE
12.1 When a roof is being laid either fully with plastictranslucent sheet or using plastic translucent sheetsin conjunction with asbestos cement/steel/aluminiumsheets in chequerboard or eaves to ridge layouts tomaintain the designed daylight factors, piastictranslucent sheets made from thermosetting polyesterresin (glass fibre reinforced) shall be periodicallycleaned with warm water and mild detergent.Persistent s~ains shall be removed by gently rubbingwith a bristle brush. Tar or grease deposited fromindustrial atmospheres shall be removed with whitespirit or acetone solvent.
12.2 To maintain sheet appearance, clean and dry
plastic translucent sheets made from thermosettingpolyester resin (glass fibre reinforced) maybe paintedwith clear, water white air drying lacquer.
12.3 Small holes or tears in plastic translucent sheetmade from thermosetting polyester resin (glass fibrereinforced) may be patched with same grade ofunsaturated polyester resin and glass fibre choppedstrand mat by using which the sheet was originallymade.
12.4 All fixings shall be periodically inspected andrenewed or retightened as necessary.
12.5 When plastic translucent sheets are laid inconjunction with asbestos cement/steel/aluminiumsheets in chequerboard or eaves to ridge layouts, allother aspects of maintaining the roof covering shallbe in accordance with the procedures laid down in therespective codes of practice for laying asbestos cementisteel/aluminium sheets.
ANNEX A
(Clause 2)
LIST OF REFERRED INDIAN STANDARDS
IS No. Title IS No. Title277:1992 Galvanized steel sheet (plain and 1120:1975 Specification for coach screws (jlrst
corrugated) — Specification (f2@r revision)revision) 1254:1991 Corrugated aluminium sheet —
459:1992 Corrugated and semi corrugated Specification (third revision)asbestos cement sheets — 12866:1989 Specification for plastic translucentSpecification (third revision) sheets made from thermosetting
730:1978 Specification for hook bolts for polyester resin (glass fibrecorrugated sheets roofing (second reinforced)revision)
17
IS 15224:2002
ANNEX B
(Foreword)
COMMITTEE COMPOSITION
Flooring, Wall Finishing and Roofing Sectional Conunittee, CED 5
Organization
hr personal capacity (A-3918,DDA Flats, Munirka, New Delhi 110067)
All India Brick&Tile Manufacturers Federation, New Delhi
Bhor IndustriesLimited, Mumbai
Builder’sAssociationof India, Mumbai
Building Materials and Technology Promotion Council,New Delhi
CEATLimited,Hyderabad
Central Building Research Institute, Roorkee
Central Public Works Department,New Delhi
Engineer-in-Chief’sBranch, Army Headquarters,New Delhi
Hindustan Zinc Limited, Udaipur
India MeteorologicalDepartment,New Delhi
In personal capacity [C-474B, Sushanl Lok, Phase 1, Gurgaon (Haryana)]
In personal capacity (5-9-f OIIJ, [st Floor, Public Garden Road,
Hyderabad 500001, Andhra Pradesh)
Indian InstituteofTechnology, Kbaragpur
Institution of Engineers (India) Limited, Kolkata
MaharaahtraEngineering Research Institute,Nasik
Ministry of Railways (RDSO), Lucknow
Modem Tiles & Marble, New Delhi
National Test House, Kolkata
ProdoriteAnti-ComosivesLimited,Chennai
Projects& DevelopmentIndia L~mited,Slndri
Public Works Department,Chennai
Rashtriya Pariyojna NirrnanNiganr Limited, New Delhi
Representative(s)
SHRJP.B. VIJAY(Chairman)
SHRIS. P. BANSAL
SHJUK.L. SHAHSHRJR K. PATSL(Alternate)
SW W. R TALWAR
SmuPAWANTALWAR(Alternate)
SHRJJ. SENG~A
SHJUS.suNDRAMMa RAJENOSRPAL(Alternate)
SHRJLAmaw JAIStNGHSHIUS. K MrTTAL(Alternate)
CHIEFENGJNEER(CSQ
SHRIMATJuPtNDsRKAoR
SmuMAmRrvooMAHINDRU(Alternate)
StrroC. S. MEHTA
SHRIA. V. R. K. RAOSHRIS. C. GOYAL (Alternate)
SHRJO.P. RATRA
SHRIMUZAWARAL.IKHAN
Ms RAJNJAHUJA
SHRIP. B. VL!AY
Cr-uEFENGtNEER& DrRF.CrORSCEN’ITFICILWARCH OFFICER(Alternate)
EXECUTIWENGEWER(P&D-II)ExEctrmvEENGtNEER(P&D-f) (Alternate)
sHrUii. C. KAPOOR
SHRJSuaHAsr+KAmR (Alternate)
SHJUD.K. KANUNOOSHRJR. I@cnR(A[temate)
SHIUM. AMWMAMJDRP.SACHJNDRAPAL(Alternate)
DRP.K. JNSWALSHarA. K. PAL(Alternate)
SUPERINIENDINGENGJiWER(P&D)
ExsctrrrvsENGJNEER(Alternate)
Smu R C. KEHIWM
SiimB. B. KANWAR(Alternate)
(Continued on page 19)
18
IS 15224:2002
(Continuedfrom page 18)
Organization
Steel Authority of India Limited, Ranchi
STPLimited, Kolkata
BIS Directorate General
Representative(s)
sHars. SAH
SHSURAWHANDRAM(Alternate)
SHrOT. K. ROYSHruB. B. BANEIUSE(Alternate)
SHRIS. K. JAIN,Director and Head(CivEngg)[RepresentingDirectorGeneral (Er-@cio)]
Member SecretariesSHIUJ.K.PRASAD
Director(CivEngg), BIS
SHRIR. K. GUFTA
Joint Director (Civ Engg), BIS
Linoleum, Rubber, Plastic Flooring, Wall Covering and Roofing Subcommittee, CED 5:3
Research, Design and Standards Organization (RDSO), Lucknow
All India RMP Manufachmm Association, New Delhi
Association of Rubber Manufacturers of India, Kolkata
Bhor IndustriesLimited, Mumbai
Birla DLW Limited, 24 Parganaa
Building Materials and Technology Promotion Council,New Delhi
Central Building Research Institute, Roorkce
DeccsmEnterprisesPvt Limited, Secunderabad
DirectorateGeneralofTechnical Development,New Delhi
Engineer-in-Chief’sBranch, Army Headquarter, New Delhi
Engineers IndiaLimited, Gurgaon
Glass FibreTechnologyCcntre, Secunderabad
HospitalsServices ConsultancyCorporation, New Delhi
In personal capacity [C-474B, Sushant Lok, Phase I, Gurgaon (Hwyana)]
INARCO Litnited, Mumbai
lntemational Airport Authority of India, New Delhi
PremierAutomobilesLimited, Mumbai
PremierVinyl FlooringLimited, New Delhi
Projects& DevelopmentIndia Limited, Dhanbad
Rikvin FloorsLimited, Hyderabad
Royal Cushion Vinyl Products Pvt Limited, hhrrnbai
DR S. P. MANIK(Convener)
SHRIV.K. JASN
SHRIA.T. MA’IHYOO
SHTGK L. SHAHSwuA.B.KAPADIA(Alternate)
SHRIM. D. MUKHERJES
SHRIB. GHOSH(Alternate)
Smu J. SENGUPTA
SIUUL, K. AGGARWAL
SHRIB. SINGH(Alternate)
SHRIA. S. RAO
SHtuG. R. INAMDAR
SHRLJ.M. GARG (Alternate)
Smrt S. K. MANIK
SwuM.L.BI.IITAN
SHIUS. MANMDAR (Alternate)
SHSUS, sUNDRAM
SHRIS.RAGHUNATHAN(Alternate)
CHAUUWNANDMANAGINGDnu?croRSHRISANtIVSOOD(A1/emale)
sHRJO. P. RATRA
SIW.IM.G.MEHTAStnuP. K. DAS (Alternate)
SHRIH.K. KULSUU!SHTTM
SHIUP. P. KrNI
SHIUT. C. GERA
SHruC. VENUPRASAD(Aliernate)
Smu P.K MAJUMDAR([email protected]. CHAKRAaORTY(Alternate)
DRB. MANUAL
SHRIP.c. RAVAL
SHRIA. DESAI(Alternate)
19
—
Bureau of Indian Standards
BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promoteharmonious development of the activities of standardization, marking and qualhy certification of goodsand attending to connected matters in the country.
Copyright.
BIS has the copyright of all its publications. No part of these publications may be reproduced in any formwithout the prior permission in writing of BIS. This does not preclude the free use, in the course of Iimplementing the standard, of necessary details, such as symbols and sizes, type or grade designations.Enquiries relating to copyright be addressed to the Director (Publications), BIS.
Review of Indian Standards
Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewedperiodically; a standard along with amendments is reaffirmed when such review indicates that no changes aceneeded; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standardsshould ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of‘BIS CataIogue’ and ‘Standards: Monthly Additions’.
This Indian Standard has been developed from Doc : No. CED 5 (5456).
Amendments Issued Since Publication
Amend No. Date of Issue Text Affected
—
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