( Reaffirmed 2000 ) IS:25$7-1984 Indian Standard CODE OF PRACTICE FOR FIXING RAINWATER GUTTERS AND DOWNPIPES FOR ROOF DRAINAGE ( First Revision ) Building Construction Practices Sectional Committee, BDC 13 Ch&ialZa C-4/38, SHRI. C. P. MALIK Safdarjung Development New Delhi-118616 Area, luembsrs SHRI. P. D. AOARWAL Reprewxting Public Works Department, Government of Uttar Pradesh, Lucknow SHXI R. K. MATHUR ( Alternate ) ' SHBID.R. BATLIVALA 8habha Atomic Research Ccntre, Bombay Hourin SHBX B. K. C~AKBABOBTY and Urban Development Corporation Lt tf , New Delhi SER;~~.~~~EL ( Alternufe ) CHIEF ( BLOUS ) Public Works Department, Government of Tamil Nadu, Madras SUPERI~~TEDTDINQENOINEER ( SPECIALBUILDING CIRCI.E) ( Altrrnute ) CHIEF ENQIN~~H-CUM-ADDITIONAL Public Works Department, Government of SECRETARY ( Band R ) Rajasthau, Jaipur EXECUTIVE ENUINEER (Alternate ) CEIEF ENQINEER ( TRAININO ) Central Public Works Department, New Delhi SUPEBI~~TEI~DINO ENGINEER SaRI d T;;;~y~g Aftmde ) Engineer-in-Chief's Branch, Army Headquarters, New Delhi SEBI A. V. GOPALKBI~HNA ( Altermfc ) Research, Desigus and Standards Organization DIRSOTOB, AROHITEOTWE ( Wit&try of Railways ), Luckuow JOMT DIREOTOR,AF.CJEITECTUB= (Altsmalr ) (_npap2) INDIAN STANDARDS INSTITUTION This publication is protected under the Irafiaa @yrf@ Aci ( XIV of 1957 ) and igoduadoa-& whole or in part by any means acept with writteu permission of tbc publisher shall be deemed to be au iufringement of copyright uudv the said Act. IS t 2527 - 1984 ( Continued&m page 1 ) Members SHRI s. s. GILL Reprwnting Public Works Department, Government of Punjab, Chandigarh SHRI M. KARTIKAYAN Builders' Association of India, Bombay SHIXI R. L. KUMAR Institution of Surveyors, New Delhi SHRI V. G. PAT~ARDEAN ( AItcmutc ) Tata Consulring Engineers, Bombay SHRI M. Z. KIJRIGN Hindustan Prefab Ltd, New Delhi SHRI G. K. MAJUMDAR SHRI H. S. PASRICBA ( Altcrnalc ) Cent;~or~;~lding Research Institute ( CSIR ), SHRI R. C. MANQAL SHRI J. S. SHARM_4 (Alternate) Concrete Association of India, Bombay SHRI B. V. B. PA1 SRRI P. SRINIVASAN ( Altcrnata) State Bank of India, Bombay SHRI P. K. PANDARE Fore;)tutesearch Institute and College+ SHRI K. S. PR~THI Dehra Indian Institute of Architects, Bombay SHRI S. G. RANADIVE SHI~I RUMMY SHROFF ( Alternate ) Mmistry of Bureau of Public Enterprises, REPRESENTATIVE Finance Central Road Research Institute, New Delhi REPRESENTATIVE Life Insurance Corporation'of India, Bombay REPRESENTATIVE National Buildings Organization, New Delhi !&RI K. S. SRINIVASAN DEPUTY DIRECTOR ( Alternate ) National Buildings Construction Corporation Ltd. SHHI SUSHIL KUMNR New Delhi Public Works & Housing Department, Bombay SHRI S. R. TAMBE SHRI B. T. UNWALLA The Institution of Engineers ( India), Calcutta ( Roads Ministry of Shipping and Transport SHRI G. VENKATESULU Wing ), New Delhi SHRI M. V, SASYRY ( Alternate, 1 Director General, IS1 (Ex-ofi& Membn) SARI G. RAMAN, Director `( Civ Engg ) SERI A. K. SAINI Assistant Director ( Civ Engg), IS1 Covering, Veneering and Glazing Subcommittee, Convenrr SER; ,J. R. BHALLA Members Indian Institute of Architecta, BDC 13 : 10 Bombay ARCHITECT,PWD SHRI S. R. VAIDYA ( Altrrnatr Public Works and Housing Department, ment of Maharashtra, Bombay Govem- ) ( Continuedon page 15 ) 2 XS : 2527 - 1984 Indian Standard CODE OF PRACTICE FOR FIXING RAINWATER GUTTERS AND DOWNPIPES FOR ROOF DRAINAGE ( First Revision ) 0. FOREWORD 0.1 This Indian Standard ( First Revision ) was adopted by the Indian Standards Institution on 14 March 1984, after the draft finalized by the Building Construction Practices Sectional Committee had been approved by the Civil Engineering Division Council. 0.2 Rainwater gutters and ,downpipes are essential for prompt removal of incident rainfall on the roof. Efficient roof drainage is an important prerequisite for the economic maintenance of a building. Installation of rainwater utters and pipes require careful attention to their capacity, position an dgalignment, water-tightness, accommodation for expansion, firmness of support, etc. This standard is intended to give guidance with regard to these details of work. 0.2.1 This standard was first published in 1963. This is being revised to update the methods being followed for installation and efficient functioning of rainwater gutters and pipes. In this revision the use of in situ concrete gutters has been discontinued since they are normally not used. Further the fixing details of different types of gutters and pipes has been dealt in detail. The sizing of rainwater pipes has been modified. 9.3 For the purpose of deciding whether a particular requirement of this standard is complied \yith, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS : 2-1960*. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard. 1. SCOPE 1.1 This standard covers the constructional details of rainwater and downpipes and their fittings for roof drainage. l gutter8 Rula fbr rounding off numerical valua ( mu&d). 3 IS : 2527 - 1984 2. MATERlALS 2.1 Rain-Water Pipes and Fittings-These shall conform to IS. . 1270-1'379" or IS : 1626 ( Part 1 )-196Ot or IS : 1239 ( Part 1 )-1979:. . 2.1.1 Jjownpipes shall be of cylindrical shape, unless otherwise specified. 2.1.2 Rainwater gutters may also I)e constructed lined usually wifh bituminous material or with Gutters may also be made of galvanized iron sheets in thickness and shall conform to IS : 277-19773. seqlicircular in section with a width at top about the do\vnpipe ( see Fig. 1 ). MAIN RAFTER r in concrete which is burnt clay products. fiat less than 1.25 mm The gutters shall be twice the diameter of r ROOF COVERING CONCRETE GUTTER Fro. I ---- TYPICAL DETAILS OF COUCRETE GUTTER FOR SLOPBD ROOF *Specification for CM iron rainwater pipes and fiittings (rrcendrmiria~ ). tSpvification Ew asbestos cement building pipes and pipe fittings, gutters and gutter fittings and roofing fittings: Part 1 Piper and pipe fittings (Jrst revision ). :Speciiication for mild steel tubes, tubular atxl other wrought rtcel fittingx Part 1 Mild stl.el tubes fjourfh rrririon ). fi.Spccificatioo [or galvanirrd steel rheets ( plain and conugatad ) ( ~k~rrotfon ). IS t 2527 - 1984 2.2 Stays for Sheet Metal Gutters 22.1 Stays shall consist of metal tubes or other equivalent distancepieces or may be an integral part of the supporting bracket, provided that the gutters is adequately reinforced to withstand all normal conditions of use. The size of stays shall not be less than the follqwing values, and alternative designs shall be of equivalent strength: a) For nominal size of gutter less than 120 mm b) For nominal size of gutter above 120 mm 12 mm diameter tube of thickness not less than that of the gutter 16 mm diameter tube of thickness not less than that of the gutter 2.2.2 Stays forming part of the supporting bracket shall be of such design that the assembly of bracket and stay is securely fixed in posit-ion. In all cases, the position of the stay shall be such as to interfere as little as practicable with the effective capacity of the gutter. 3. NECESSARY INFORMATION of rainwater pipes and 3.1 For the efficient planning and installation gutters, detailed information with regard to the following is necessary: a) The maxiurn intensity of rainfall system is to be designed; and for which the roof drainage b) Local bye-laws, if any, governing house drainage, which will affect the design and installations of rainwater pipes and guttersi information 3.2 All ._ ^ ^ . as in 3.1 shall be made available to those who are responsible !br tixing rainwater pipes and gutters. Necessary drawingr and instrtictions shall also be fur.nished. 4. STORAGE AND HANDLING OF MATERIALS shall be 4.1 The storage and handling of gutters and pipes accordance with IS : 4082- 1977% 5. DESIGN CONSIDERATIONS done in 5.1 GenedThe roof of a building shall be so designed, censtrtlcted and framed aa to permit effectual drainage of the rahwatkr by sufficient: number of pipes and gutters of adequate size, so arranged, jointed and Sxed a to ensure quick carriage of iainwater away from the roof without causing damMa. l Ruomme8d8tbu rairiir ). 08 rtackitbg aid atomga of comtructionm8tcrhlr at rite (Jat 5 IS t 2527 - 1984 5.X.1 Capacity- The gutters of downpipes shall have sufficient crosssectional area and slope to ensure collection and removal of water even in the case of the heaviest rainfall without risk of dangerous accumulation. The orientation of the building and the exposure of the site may also affect the quantity of rainfall which the roof receives and so attention should also be paid to such factors. 5.2 Rainwater Gutters slope for the roof gutters shall normally be not less 5.2.1 Slope -The than 1 in 150. 5.2.2 Flow Capacity - The flow capacities for gutters with the minimum slope stated in 5.2.1 and with outlet at one end will be as given in Table 1. TABLE 1 FLOW CAPACITIES FOR LEVEL GUTTBRS WITH OUTLET AT ONE END SIZE FLOWIN Lrralrs PEB MINUTEIN VARXOUSTYPES or GUTTESS ' Sheet Steel or Asbestos Cement -Half Round (2) 35 70 95 125 195 Cast I;oioz Half Sheet Steel or Asbestos Cement - Qgee (4) 90 125 150 240 cast Iron _T Ogee (1) mm 75 loo 115 125 150 (3) 25 55 70 90 150 (5) 75 115 145 220 5.2.21 Efect of bsnds - Where gutters have bends, tbt flow capacity will be reduced. In the case of right-angled bend the reduction of flow capacity will be about 25 percent. 5.222 Effect of out& and down `pez- The shape, size and position of ect the flow capacity of the gutter. the outlet and downpipe will .a tF Round-cornered outlet will give a smoother flow than sharp-cornered ones. The position of the outlet will also affect the flow capacity of the gutter but in deciding the location of-the outlet, several factors, such as ease of connection to the disposal ryatem and the appearance, have a+ to be considered. When the outlet. is placed centrally in the length of a gutter, capacity required will be one-half of that needed for an end-outlet. 6 9 IS : 2527 - 1984 5.2.23 Efict of roof "dgc in dticharging the water into the gutter- The manner in which the water leaves the edge of a roof varies with the kind of roof covering used, and this will influence the location at which the gutters shall be fixed. Where, as for instance in a slate roof, the water leaves the edge with very little spread to front or rear, the position of the gutter may be centrally under the edge, on the other hand where the water leaves the edge with a wide spread; such as in the case of clay pantiles ( with sharp upper corner to the edge ), the gutter shall be close to the edgewith its centre slightly forward to the under edge of the roof. Where the lower corner of the roof edge is rounded, the water may be deflected more to the rear, and the centre of the gutter may preferably also than be placed slightly to the rear. The most satisfactory roof edge will be one with the upper corner round and the lower corner sharp. 5.3 Size8 of Rainwater Pipe8 5.3.1 The sizes of downpipes suitable for variable given in Table 2 with a variation off 5 mm. TABLE 2 SIZES OF DOWNPIPES SUITABLE GUTTERS SIZX or PIPE FOB gutters shall be as SIZES OR HALF-ROUND VARIOUS r--- ---A---_ For Sharp Cornered Outlet ~-----~---) With outlet With outlet at one end at any intermediate position in the length of pipe mm 75 100 115 125 150 calculations mm 50 65 65 75 90 for flow prove mm 50 65 75 90 100 their suitability. -----7 For Round Cornered Outlet r_---_*-_-_-~ With outlet With outlet at one end at any inter. mediate position in the length of pipe mm 50 50 50 65 75 mm 50 50 65 75 100 if specific NOTIE - Sizes other than those specified in the table may be adopted, 5.3.2 Rainwater Pi@with Table 3. Sizes of rainwater pipes shall be in accordance 5.5.5 The pipes shall be so designed as to give a velocity of flow not less than 1 m/a where running half full. The maximum velocity shall not exceed 2'5 m/s. 7 IS I 2527 - 1984 TABLE 3 SIZES OF RAINWATER DTA CJPI'IPE PIPES FOR ROOF DRAINAGE ~---_-____-__I) 100 125 5.3 96 ,I@3 34.2 64.3 mm/h 150 4.4 8.0 13.6 28.5 53.5 83.6 200 3.3 6.0 IO.2 21.3 40.0 62.7 lz. ml11 i) 50 ----------50 13.4 24.1 40.8 85.4 - AVERAOERATEO~RAIN~ALLI~ 55 8.7 16'0 27.0 57.0 - Roof Areaa, m* ii) iii) iv) v) vi) 65 75 100 125 150 6.6 12'0 20.4 42.7 80.5 - 5.3.4 A bell mouth inlet at the roof surface is found to giver better drainage effect provided proper slopes are given to the roof surface. The spacing of pipes depends on the position of windows and openings but 6 m apart is a reasonable distance. 5.4 Water-Tightness - All junctions and joints shall be thoroughly water-tight, riveted, belted and soldered. Joints between successive length of gutters shall have an overlap of at least 50 mm. The drop in the overlap of the gutter shall always be in the direction of the fall. Ends of guttering rhall be closed with galvanized sheets not less than 1.215 mm in thickness to fit the section and made water-tight. Junctions with downwater pipes shall be made water-tight. 5.5 Strength and Stability 5.5.1 Gutters if located at the exterior like the eaves and roof edges will be subject to high wind velocities. The effect of zones of very low pressure for certain angles of incidence of the wind shall, therefore be taken into account in the design and reference may be made to 1s : 8751964.. Gutters shall be fixed 25 mm below the edges of the roof supported with brackets aLt about 1.25 m intervals. Roof gutters if required may also be designed for occasional live loads which are likely to occur during erection and other operations. 5.6 Allowance for Expansion of Shrinkage 5.6.1 Variations in temperature, and for materiala other than metal, differences in relative humidity, will cause linear changes resulting in displacements of gutters and pipes in relation to the building, and v allowance shall be made for free expansion to prevent any undue stresses in them or blistering and cticking of the outer finish. *Code of practice for structural s&t; of build+ Loading l taadmda (r&d). 8 5.6.1.1 Provision made for expansion of gutters (see 5.6.1.2 ) shall accommodate their linear changes. Where the expansion accommodated is less than 20 mm, the length of the gutter between the expansion joints shall not exceed 30 m for sheet steel, asbestos cement or cast iron gutters. 5.6.1.2 The expansion devices for gutters the may be provided expansion joints as follows: shall be a) For sheet metal gutters provided as in Fig. 2; 2A FREE END :B FIXED END 2G ENLARGED SECTION XX DETAILED FIG. VIEW OF 20 I! TYPICAL DETAILS OF EXPANSION JOINT FOR Smm GIJTTRR LINING METAL IS : 2527 - 1984 b) For bituminous lining over wooden or similar backing, joint shall also be provided fsr lateral expansion as in Fig. 3; and c) For concrete gutters expansion joints shall be provided in the same manner as for reinforced concrete slabs. FIG. 3' TYPICAL DETAILS FOR ACCOMMODATION OF LATERAL EXPANSION IN FLEXIBLE LII~ING IN GUTTERS 6. PROGRAMMING OF THE WORK 6.1 The rainwater pipes shall be fixed to the outside of the external walls of the building or in recesses. or chases cut or frame in suchexte*mal wall. Work to the extent necessary for supporting the rainwater fittings properly in position shall be completed before the person entrusted with the job of fixing rainwater gutters and pipes starts his work. Any plaster finish in building work near the location of the downpipe shall be Hold fasts an.d clamps for the completed before fixing of the downpipe. pipes may also preferably be fixed to the wall before plastering, so as to avoid disturbing the plaster finish later. 7. FIXING DETAIES 7.1 Rainwater Gutters 7.1.1 Asbestos Cement Gutters - Gutters shall be laid with a minimum fall of 1 in 150 which should be increased where possible. Gutters shall be true to line and slope and shall be laid with the requisite accessories such as drop ends, stop ends, nozzles, angles and union clins as directed. The size of outlet of drons ends and nozzles shall be same `as the size of the rainwater.pipes into-which they discharge water. The requisite slope 10 15 I 2527- 1984 in the gutter shall be given in the line of brackets. be placed at not more than 900 mm centre. The brackets shall 7.1.1.1 Socketed gutters shall be supported with a bracket close to the socket and another in the centre of the gutter. Plain-ended gutters shall be supported with a bracket on either side of each joint; and for gutters of large size, one extra bupporting bracket in the centre of the gutter shall be fixed. 7.1.13 Brackets shall be fabricated from mild steel flats and mild steel rods ( see Fig. 4 ). All brackets shall be provided with a suitable means of securing the gutters in position at the back. MS ANGLE OR WOODEN PURLIN MS GUTTER CLAMPS ONEON EITHER SIDE 4A VALLEY WOODEN GUTTER / PURLIN MS ANGLE OR MS FLAT GUTTER CLAMPi / 48 HALF ROUNDGUTTER FIG. 4 FIXING OF ASBESTOS CEMENT GUTTERS 7.1.1.3 The angular space between the socket and the spigot shall be filled with a few turns of spun yarn soaked in bitumastic jointing compound. It shall be pressed home by means of a caulking tool. More 11 IS, t 2527 - 1984 skeins of yarn shall be wrapped, if necessary, and well rammed home. The joint shall then be finished with bitumastic compound at an angle of 45". from 7.1.2 Shset Metal Gutters - These gutters shall be fabricated galvanized iron sheets not less than 1.25 mm in thickness and may be The spacing of stays should not stiffened with stays where necessary. Stays of the tubular pattern shall be soldered in position exceqd 400 mm. in the gutter. 7.1.2.1 Jointing - All joints shall be lapped and soldered for at least 40 mm in the direction of flow. In case where the joints are soldered, the jointing faces of sheet metal gutters shall be primed with solder to ensure Soldering of the resulting joint throtrghout running of the jointing metal. the full girth of the gutter and to the full extent in the lap shall be ensured. Jointing may also be done by press-folding of the jointing faces. 7.1.2.2 Fixing - Gutter shall be laid with a minimum fall of 1 in 150. All gutters shall be supported at centres not exceeding 750 mm and supporting brackets or screws shall normally coincide with alternate stays. Where brackets are to be fixed to the side of rafters, they shall be bent to shape and fixed rigidly to the sides of rafter with 10 mm dia bolt. The brackets shall lap with rafter not less than 300 mm and connecting Where the brackets are to be fixed to bolts shall be at 120 mm centres. the purlins the brackets shall be bent to shape with one end turned at right angle and fixed to the purlin face with 10 mm dia bolt, nut and The perpendicular over hung portion of the bent to shape shall washer. be fixed to the brackets with 2 No. 6 mm dia bolt. The requisite slope in the gutter shall be given in the line bracket. The brackets shall be placed at not mol;e than 1 200 mm. For connection to down take pipes, a proper drop end or funnel shaped connecting piece shall be made out of sheet of the same thickness as the gutter and riveted to the gutter the other end tailing into the socket of the rainwater pipe. The gutter when fixed shall be true to line and slope and shall be water-tight. 7.2 Rainwater Pipes 7.2.1 Cast Iron Pipes -The pipes and fittings shall be fixed in vertical alignment unless otherwise specified. The pipe and fittings shall be secured to the walls. Wooden cleats shall be inserted so that the pipes and fittings are kept at a distance of not less than 30 mm from the wall to facilitaLe cleaning, painting, etc. If not provided with lugs, the pipes shall be secured to the wall at all joints by means of mild steel or cast iron holder bat clamp (see IS : 1230.1979* ). Pipes which are provided ?Spccifc*tion for cut iron rainwater piper uid fitting8 ( srcod rmisioa ). 12 . IS : 2527 - 1904 with suitable lugs may be directly fixed to ,the wall by means of screws inserted into suitable wall plugs ( see Fig. 5 ). 7.2.2 Asbestos Cement Pipes - The pipe and fittings shall be fixed in vertical alignment unless otherwise specified. The pipe and fittings shall be secured to the walls with mild steel holder bat clamps in the same manner as given in 7.2.1 for cast iron pipes. %lN IN BITIJMASTIC JOINTING COMPw YARN SOAKED LIME MORFAR DFTAIL FOR JOINT DETAIL OF BRACKET FOR FIXING FIG. 5 A TYPICAL DETAIL SHOWING FIXING OF DOWNPIPES TO WALL FOR ROOF DRAINAGE 7.2.2.1 Jointing - The annular space between the socket and the spigot shall be filled with spun yarn soaked in bitumastic jointing compound. It shall be pressed home by means of a caulking tool. More skeins of yarn shall be wrapped, if necessary, and well rammed home 13 IS : 2527 - 1984 The joint of 450. shall then be finished with bitumastic compound at an angle 7.23 Sheet Metal Pipes - The pipes shall be held by clamps fixed tothe structure by means of wood screw inserted into suitable wall plugs. Where it is required to fix the pipe clear of the wall, a hardwood block shall be used and shall be secured in place by screws inserted into suitable wall plugs. The overall size of the block shall be the same as that of the `ears' of the pipe so ag to afford full support to their entire surface (see Fig 6) /ROOF COVERING /WOODEN BATTEN SHEETMETAL WALL PLATE GUTTER STEEL EIRACKETS (AT SUITQLE INTERVALS J 30 mm mtnJ I_ FIG. 6 A TYPICAL DETAIL OF FIXING OF SHEET METAL GUTTERS AND DOWNPIPES FOR SLOPED ROOF 8. INSPECTION AND MAINTENANCE 8.1 All gutter pipes and sockets shall be carefully examined for defects before they are installed and also on completion of the work. Each pipe shall be rung with a hammer or mallet and those that do not ring true and clear be rejected. Sound pipes shall be carefully stored to prevent damage and blockage. Cast iron pipes shall be carefully examined for damage of protective coating. 8.2 The gutters and pipe shall be inspected defect discovered shall be made good. 14 at regular intervals and any IS r2527 -1984 ( Continued from page 2 I Mmbns SHRI S. K. CEANDA Representing Public Works Department, Government of West Bengal, Calcutta CHIEF ARCHITECT Central Public Works Department, New Delhi SENIOR ARCHITICT ( H and TP ) II (Alternate ) SERI G. K. DAMANI Alumilite Pvt Ltd, Calcutta SHRI V. MISERA ( Alternate) SHRI S. P. GCPTA Hindustan-Pilkington Glasr Works Ltd, Calcutta SHRI C. V. CHALAM (Alternate ) SHRI T. N. GUPTA Cent;raoryezding Research Inatitute (CSIR ), SARI N. K. SAN~RARI ( Alternate ) Concrete Association of India, Bombay SHRI P. SRINIVASAN ( Altematr ) SERI R. L. KUMAR The Institution of Surveyors, New Delhi SEEI P. J. MEETA The Imtitution of Engineers ( India ), Calcutta SHRI B. NATARAJAN Kent Ceramic Tiles Co Pvt Ltd, Madras SHRX K. S. PRUTHI Foreat Research Institute and Collegea, Dehta Dun SHRI H. K; RAKHRA Engineer-in-Chief's Branch, Army Headquarters, New Delhi SHRI J. RAMAMURTHY ( Alternets ) SHRI K. S. SR~IVASAN National Building Organization, New Delhi SERI A. K. LAL ( Alternate ) SHRI SUBRATO RAY Balmer Lawrie and Co Ltd, Calcutta SRRI K. SUBYANARAYANAN Indian Aluminium Company Lid, Calcutta SERX AXJAN SEN ( Alternate ) SHRI G: R. JOEHI INDlAN ON COVERING, STANDARDS VENEERING AND GLAZING IS: 1414-1962 Code of practice for fixing wall coverings 1649-1962 Code of practice for design and construction of Rues and chimneys for domestic heating appliances (jrst revision) 1946-1961 Code of practice for use of fixing devices in walls, ceilings and floors of solid construction 2441- 1963 Code of practice for fixing ceiling covering 2527-1984 Code of practice for fixing rainwater gutters and downpipes for roof drainage ( f;rsr r&An ) 3548-1966 Code of practice fot glazing in buildings 4!01 ( Part l )-1967 Code of practice for external facing and veneers: Part 1 Stone facing 1401 ( Part 2 )-1967 Code of practice for external facing and veneers: Part 2 Cement concrete facing 4101 ( Part 3 )-1968 Code of practice for external facing and veneers: Part 3 Wall tiling and mosaics 4407-1967 Code ofpractice for reed walling 5119 ( Part l )-1968 Code of practice for laying and fixing of slopped roof coverings: Part 1 Slating 10439-1983 Code of practice for patent glazing