( Reaffirmed 2002 ) IS : 9472 - 1980 Indian Standard LAYING Building CODE OF PRACTICE ~FOR OF MOSAIC PARQUET FLOORING Construction Practices Sectional Committee, BDC 13 Chairman C-4/38, Members SHRI C. P. MALIK Safdarjung Development Area, New Delhi Representing ADDITIONAL DIRECTORSTANDARDSRailway Board ( Ministry of Railways ) ( AROHITECTURE ), RDSO, LTJOENOW DIRECTOR JOINT ( ARCEITECTUI~E ), RDSO, LUCKNOW ( Alternate ) Housing & Urban Development Corporation Ltd, SHRI P. M. APT= New Delhi Forest Research Institute & Colleges, Dehra Dun SHRI A. N. BAJAJ SHRI D. R. BATLIVALA Bhabha Atomic Research Centrc, Bombay Indian Institute of Architects, New Delhi SERI J. R. BRALLA Department, Government of Public Works SHRI M. G. BHAR~AV~ Uttar Pradesh, Lucknow SHRI R. K. MATHUR ( AlfernateJ CHIEF ENGINEER( BLDOS), PWD, Public Works Department, Government of Tamil Nadu MADRAS S~PERIN~ENDINOENOIN~ER, ( SPECIAL BUILDINO CIRCLE ), PWD, MADURAI ( Alternafc) CHIEF ENOINEER-CUM-ADD~TIONAI, Public Works Department, Government Of Rajasthan SBCRETARYTO THE GOVERNMENT( B&R) EXECUTIVE ENOINEER ( DELIION & SPECIFIOATION ) ( Alferna&3 ) CHIEF ENOINEER( NDZ ) Central Public Works Department, New Delhi SUPERINTENDINQSURVEYOR ov WORKS ( NDZ ) ( Alternate ) PROPDINESE MOHAN Central Building Research Institute ( CSIR ), Roorkee SERI J. S. SHARMA ( Alternate ) &RI H. S. DU~AL Builders' Association of India, New Delhi BRIQ HARISH CHANDRA ( Alternate ) ( Continued on #age 2 ) @ Cofiyrighr 1980 STANDARDS INSTITUTION INDIAN This publication is protected under the Indian Copyright Act ( XIV of 1957 ) and reproduction in whole or in part by any means except with written permission of the publisher shall be deemed to be an infringement of copyright under the raid Act. IS :9472 - 1980 ( Concinucdjrom Members page 1 ) Representing Public Works Department_, Government of Punjab SERI B. S. GREWAL National Buildings Orgamsation, New Delhi SHRI K. K. KHANNA SFI~I K. S. SRINIVASAN ( Afternate ) Institution of Surveyors, New Delhi SERI R. L. KUMAR SHRI K. S. KHARB ( Alternate) Tata Consulting Engineers, Bombay SHRI M. 2. KURIEN Hindustan Prefab Ltd, New Delhi SHRI G. K. MAJUXDAR SHRI H. S. PASRIOHA ( Al&n& ) Life Insurance Corporation of India, Bombay Saar R. K. PANDARE DEPDTY CHIEF ENOINEER SRRI G N;,,$($ern,, ) Public Works & Housing Deptt, Bombay Bureau of Public Enterprises ( Ministry of Finance ), SHRI T: K. SARAN New Delhi SHRI S. S. KAINAL ( Altrrnafr ) Engineer-in-Chief's Branch, Army Headquarters, SHRI R. D. SINOH New Delhi SHRI M. G. VIRMANI ( Altrrnate ) Gammon India Ltd, Bombay SHRI S. R. SIVASWAMY SHRI H. D. MATANQE ( Alternate ) National Buildings Construction Corporation Ltd, SIIRI SUSHIL KUMAR New Delhi Concrete Association of India, Bombay Soar B. T. UNWALLA SHRI Y. K. MEHTA ( Alfsrnatc ) Institution of Engineers ( India ), Calcutta SHRI B. T. UNWALLA Director General, ISI ( Ex-o&So Member ) SHRI D. AJITHA SIYEA, Director ( Civ Engg ) SsGrGta?" SHRI S. SEN GUPTA Assistant Director ( Civ Engg ), IS1 Timber Convener SHBI A. N. BAJAJ Membrrs to Shri A. N. Baiai ) DEPUTY DIRE&O< STANDARDS Railway Board ( Ministry of Railways ) ( B & S ), RDSO, LUCENOW SHRI P. N. GADI Institution of Surveyors, New Delhi SERI K. S. KRARB ( Alternatr ) Pest Control ( India ) Pvt Ltd, Bombay SHRI M. S. KOPPIEAH SARI T. R. RAO ( Alfcrna~r ) Hindustan Prefab Ltd, New Delhi SHRI G. K. MAJU~DAI~ SERI H. S. PASRICHA ( Alternafs J of Standardization ( Ministry Directorate SERI L. M. PART~ASARTFIY Defence ) SHRI R. A. PANSE ( Altsrnatr) SERI R. K. GUPTA ( Altcrnata Engineering Subcommittee, BDC 13 : 4 Dun Forest Research Institute & Colleges, Dehra of ( Con:inuad en pugs 12 ) 2 IS: 9472 -1980 Indian Standard CODE OF PRACTICE FOR LAYING OF MOSAIC PARQUET FLOORING 0. FOREWORD 0.1 This Indian Standard was adopted by the Indian Standards Institution on 29 February 1980, after the draft finalized by the Building Construction Practices Sectional Committee had been approved by the Civil Engineering Division Council. 0.2 Timber mosaic parquet floors are used in auditoria, squash courts, Mosaic parquet conskating-rinks, dancing halls, drawing rooms, etc. sists of many small pieces ( slats ) which are able to compensate very -successfully the inevitable warping of wood due to variations in humidity without resulting in gaps so objectionable in strip parquet. At the same time, glueing also remains perfect. Alterations in the degree of humidity of wood ( either due to water content of the air or of basic floor ) lead to only minimum moisture expansion or shrinkage which is normally not visible to naked eye. 0.3 With mosaic parquet, new patterns in fhe flooring may be provided which are not possible by means of conventional st~rip parquet without itivolving additional cost. The characteristics of mosaic parquet suit the taste of modern architects. By insertion of slats in different colours or by mixing different species of wood it is possible to obtain a wide range of patterns. Mosaic parquet has advantages like acoustic absorption, heat insulation, aesthetics, durability, etc. 0.4 In the formulation of this standard due weightage has been given to international co-ordination among the standards and practices prevailing in different countries in addition to relating it to the practices in the field in this country. 0.5 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 accorThe number of significant places retained in dance with IS : 2-1960*. the rounded off value should be the same as that of the specified value in this standard. *Rules for rounding off numerical values ( 3 revised ). IS : 9472 - 1980 1. SCOPE 1.1 This standard describes the quality parquets, the dimensions and manufacture methods of laying of parquet flooring. 2. TERMINOLOGY 2.0 For the purpose of this standard, definition IS : 707-1976* and the following shall apply. 2.1 Component Square -Assembly making up a square, the side of which of terms as given in of timber used in mosaic of mmosaic parquets, and of slats placed edge to edge is equal to the length of the slat, 2.2 Floating Floor -An insulated floor in which rebated wood battens rest on rubber isolators. The battens are loaded with slabs to prevent springing; and are boarded in the usual way. 2.3 Floor Seals -Any substance used in timber floor finishing to fill pores in surface so as to decrease porosity of surface for finish coatings. 2.4 Mosaic Parquet Panel - Aggregate made up from wood components ( slats ) laid on a single layer and preassembled by juxtaposition ( either by means of material temporarily fixed, for example, paper-glued on the face ) or of a sufficiently flexible material, permanently fixed. Generally, the panel is square in shape, being made up from slats assembled in component squares, laid in a chequered pattern ( see Fig. 1 ). L SLATS FIG. 1 TYPICAL ILLUSTRATION OF MOSAIC PARQUET PANEL of parquet floor having large areas and 2.5 Panels - Regular patterns laid in symmetrical designs. *Glossary of terms applicable to timber technology and utilization ( seGand r&ion ). 4 IS : 9472 - 1980 in which floors consist mainly of 2.6 Parquet Floors - A construction sub-floor of timber boards and floor finish of timber parquets which are laid in variety of panel designs as well as in square edged hard wood battens. 2.6.1 Parquet - Aggregates of parquet slats plane and forming the upper part of a floor. 2.7 Slat ( of Mosaic Parquet dimensions having regular form 3. NECESSARY INFORMATION shall be taken into account before laying assembled in horizontal small ) - Solid wood component of and planed edges ( see Fig. 1 ). 3.1 The following information mosaic parquet flooring: a) b) c) d) e) f) g) h) j) k) m) n) p) q) Floor Type Species Thickness Relationship Type Type to be covered; of panel design to be adopted; and grade of timber to be used; floor; of flooring; to the level of finished if any; bed, if any; passing through flooring; if any; upon services of screeded of damp-proofing, and thickness treatment, Preservative Type Any work consequent of underlay, of fixing; of skirtings; of junction or polish TIMBER Method Treatment Treatment Any dressing OF if any; with adjacent required. flooring; and 4. QUALITY 4.1 Species of timber recommended for according to the percentage of indentation 100 are given in Appendix A. use in floor panels specified for hardness taking teak as 4.2 Timber selected for construction of floor panels and supporting members shall conform to the requirements given in 4.2.1 to 4.2.4. 4.2.1 The percentage indentation for hardness for species of timber shall not be less than 55 ( taking the value for teak as 100 ) as given in Appendix A so as to withstand constant wear and tear. 5 IS : 9472 - 1980 4.2;2 The species selected from amongst those given in Appendix A shall preferably be of non-refractory nature, free from defects such that it is rapidly seasoned; and is easily seasoned in open air and sun with systematic stacking. 4.2.3 Thickness of floor boards shall be between 25 mm and 40 mm. any of the species 4.2.4 Depending given in Appendix 4.3 upon av$ability and A may be used for floor strength, boards. General Requirements by of or 4.3.1 Wood used shall be sound and free from any damage caused insects or by fungus, which may affect the wear resistance properties Ring-shakes are not permitted. the wood. 4.3.2 Any treatment applied fixing and bonding characteristics shall not affect of the material. either appearance 5. CLASSES OF PARQUET PANELS In both classes, 5.1 Mosaic parquet panels are divided into two classes. -sound knots with a diameter not exceeding 2 mm each and loose knots with a diameter not exceeding 1 mm each shall be permitted. The standard classes shall comply with the respective conditions stated in 5.2 and 5.3. half quarter or rectangular sawn 5.2 Class I - Slats may be quarter, provided that the number of tangential sawn slats does not exceed 30 percent of slats in each panel. Face shall be free from knots other than those specified in 5.1 as well as from decay and abnormal colourations. Knots up to 5 mm in diameter each and with other slight defects are permitted for backs. NOTE 1 - An abnormality in chemical composition of wood causing a change properties and affecting usefulness of the material is considered to be ` decay `. NOTE 2 - A colouration which is different from the normal average colouration sound wood of a given species is considered to be ` abnormal colouration `. of of 5.3 Class II shall be prrmitted a) Only one of the defects mentioned on the face of any one slat: in (a) to (g) below Sound knots, of a colour very nearly approaching that of adjoining wood ( sound knots ); b) Loose kno:s, of a colour contrasting with that of adjoining wood; c) Cross grain; d) Waned wood; e) Seasoning checks; f) Resin pockets; and g) Stains. 6 IS : 9472 - 1980 5.3.1 The Table 1. 1 above defects should not exceed the limits specified in TABLE LIMITS FOR DEFECTS PARQUET IN TIMBER PANELS USED FOR CLASS II MAXIMUM LENQTH OE SEASONING CEECKS mm (1) 30 WIDTH OB WANES AND RESIN POCKETS IN RELATION TO WIDTH OF SLAT (2) l/25 LARGESTDIMENSION OP KNOTS IN RELATIONTO TEE WIDTH ow SLAT ~_--__~~-~---~ Loose Knots Sound Knots (3) l/5 (4) 112 5.3.2 Traces of modullary sheath are not permitted. 5.3.3 Back may exhibit knots or other defects of a larger size provided -these do not impair wear resistance of the material. 86. TREATMENT AND PROTECTION OF TIMBER 6.1 Seasoning 6.1.1 All timber IS : 1141-1973*. .6.2 used shall be thoroughly seasoned in accordance with Preservation shall be treated with timber preservatives in 6.2.1 After seasoning timber .accordance with IS :401-19677. again 6.2.1.1 In case of water soluble preservatives for the second time after preservation. shall be seasoned 6.2.1.2 In construction in which anti-termite [ see IS : 6313 ( Parts I, II and III )-1971: ] have `timber may not be chemically treated. 7. DIMENSIONS chemical measures been incorporated, AND WORKMANSHIP and tolerances given in 7.1 and .7.0 General refer to slats mass. - The dimensions with a reference -moisture content of 12 percent on 7.2, dry *Code of practice for seasoning of timber (Jirsf rcuirion ).. tCode of practice for preservation of timber ( recond ICZJISIOI~ ). *Code of practice for anti-termite measures in buildings: Part I Constructional measures. Part II Pre-constructional chemical treatment Part III Treatment~for existing buildings. measures. 7 IS : 9472 - 1980 7.1 Dimensions dimensions: a) b) c) The rectangular slats shall have the following ZXckness : 6, 8 and 10 mm; the 6 mm thickness for softwood and for softer grades of hardwood; is not suitable Width : 18 to 25 mm, preferred Length : 100 to 150 mm. -The 165 mm, tolerances widths being 20 and 25 mm; and being 100, are 125 and given in preferred lengths V.2 Tolerances Table 2. on above dimensions NOTE - A panel, however, is considered to be acceptable if not more than 5 pzrcen' of the slats have dimensions with deviations exceeding twice the size of the deviations indicated above. TABLE SL 2 TOLERANCES ON DIMENSIONS THICKNESS mm OF SLATS AND PANELS WIDTH mm (4) f 0.5 0'2 0'2 f f i LENGTH mm (5) * 0.5 0.2 f DIAGONAL* mm (6) 0.8 CHARACTERISTIC No. (1) i) ii) iii) (2) On a single panel On each component of a panel square * f (3) 0.2 0'2 On any point of any slat making up a panel AO.2 *In relation to the nominal theoretical diagonal. 7.9 Workmanship finely sawn faces ends. edged. 8. CONSTRUCTION Slats shall have machine planned edges and Faces, edges and ends shall be square and sharp 8.1 Protection Against Moisture - Entry of ground moisture may be prevented by inclusion of damp-proof layer ( see IS : 1322-1970*) at an appropriate position in the building. This layer shall be impervious to moisture in liquid and vapour form and shall extend without a break over the whole area of flooring. 8.2 Adhesives for Mosaic Parquet Construction 8.2.1 Mosaic parquet is glued by means of solvent and dispersion Epoxy resin or phenolic resin ( resorcinol formaldehyde ) or adhesives. *Specification for bitumen felt for waterproofing and damp-proofing ( sccondr&ion )_ 8 IS : 9472 - 1980 urea-formaldehyde synthetic adhesives are suitable for mosaic parquet construction. They are resistant against shearing strains and are clean and simple to employ. Solvent adhesives ( sometimes called emulsion adhesives ) are viscous solutions of natural or synthetic resins with good adhesive powers mainly using spirits as a solvent. Synthetic resins are also used for dispersion adhesives. 8.2.2 All parquet adhesives are diluted ( mixed ) with various mineral components because these are intended to serve, at the same time, as a kind of `primer'. These are applied by means of a toothed steel trowel, as thin as possible. Only a limited area shall be primed at a time in order to prevent presetting. 8.3 Mosaic Parquet Over Battened Floors 8'.3.L Mosaic parquet may be fixed to battened floors provided floors Attention shall be paid are even and have been equalized by grinding. to the fact that mosaic parquet is laid diagonally towards the direction of the battens. As battens often expand or shrink to a certain extent, open gaps thus arising will be visible if parquets are laid parallel to the direction of the battens. 8.3.2 In very old and uneven battened floors it is recommendable to insert plywood, block board or particle board between the batten floor and the mosaic parquet if these floors are to be covered with parquet. The boards may be glued or nailed to the floor, and the old batten floor shall be equalized by grinding prior to application of the board. 8.4 Laying - Adhesive shall be applied on the prepared and dry background surface and on the back of the parquet, if necessary. In order to obtain effective adherence, it may be necessary to slide parquet panel or apply pressure over panel depending upon the type of adhesive used. Joints of the work shall be very thin and fine. 8.5 FinishingMosaic parquet floors shall be finished in accordance with the recommendations given in IS : 2338 ( Part I )-1967*, IS : 2338 ( Part II )-19677 and IS : 4597- 1968+,. *Code of practice for finishing of wood and wood-based matcrials:jPart I Operations and workmanship. t&de of practice for finishing of wood and [wood-based materials: Part II Schedules. fCode of practice for finishing of wood and wood based products with nitrocellulose and cold catalysed materials. 9 IS : 9472 - 1989 APPENDIX A ( Clauses 4.1, 4.2.1, 4.2.2 and-4.2.4) SPECIES OF TIMBER RECOMMENDED FOR MOSAIC PARQUET -PANEL SLATS USED IN A-I. The following for hardness taking floor boards: species listed according to percentage of indentation teak ( Tectonagrandis Linn. f. ) as 100 -may be used for spp. ) A. Juss. ) ) 135 130 130 130 1. Gurjan 2. Rohini 3. Padauk 4. 5. (Dipterocarpus ( Soymida febrzfuga ( Ptcrocarpus dalbergioides Roxb. ( Chloroxylon swictcnia DC ) ( Carallia brachiatta Merr, Satinwood Maniawga Axlewood ) ( Syn. ) ) ) 125 120 120 100 100 C. integerrimma 6. DC ) ( Anogcissus latifolia Bedd. 7. Kala Siris ( Albizja odoratissima Benth. 8. 9. Bijasal Laurel ( Ptcrocarpus marsupium Roxb. ~( Terminalia alata Roth. ) ) 10. White Chuglam ( Sapwood ) ( T'crminalia bialata Kurz 100 100 11. Teak ( Tcctona grandis Linn. 12. Lendi 13. White 14. Kindal f. ) ) ) ( Lagerstroemia parvij?ora Roxb. Cedar 95 95 95 90 90 ) 90 85 85 ) ( Syn. 85 80 ( Dysoxylum malabaricum Bedd. ) ( Terminalia paniculata Roth. 15. Pali ( Pulaquium ellipticurn Engler. 16. Kokko 18. Kassi 19. Sirsoo 20. ( Albizja lebbcck Benth. ( Bridelia spp. ) ) ) 17. Rosewood ( Dalbcrgia latifolia Roxb. ( Dalbergia sissoo Roxb. ) Piney ( Kingiodendron pinnatum charms Hardwickia pinnata Roxb. ) 21. Jarul ( Lagerstrocmia sprciosa Pers. ) (Syn. L jlosreginac Retz ) 10 IS : 9472 T 1980 75 70 65 60 22. Hollock 23. 24. 25. 26. ( Termindia myriocarpa Heurck & Muell. Arg. ) Anjan ( Hurdwickiu 6iwzta Roxb. Fir ( Abius pindrow Royle. J Cypress ) ( Cuprcnus torufosa D. Don ) Machilas ( Muchilus macrunthu Nees. ) 55 A-l.1 For detailing species of timber suitable for floor boards ( listed in order of hardness strength ) other important characteristics, namely, shock resistability and retention of shape have also been taken into account. 11 IS : 9472 - 1980 ( Confinurdfmm page 2 ) National Buildings Organisation, Engineer-in-Chief's New Delhi Central Ruilding Roorkee Branch, Research New Delhi Headquarters, (CSIR ), Members DR R. S. RATRA SHRI A. K. LAL ( A~teraafc ) Sam P. R. RIJSHIN~BANI MAJ V. S. RAO ( AIternatr ) SERI SURINDER SIN~II SHRI Y. SIN~H ( Alternate ) SUPE~RINTENDIN~ SURVEYOR OF WORKS ( CZ ), CPWD, NEW DELHI SURVEYOR OP WORKS ( NDZ ) ( Alfcrnatc ) ENQINEER SUPERINTENDING L;rH;;INO) PWD ( B & R ), Army Institute Central Public Works Department Wing ), New Delhi ( Architectural Public Works Department, Madhya Pradesh, Bhopal Government of. 12