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TitleI S 1661 - 1972 R 1996
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Table of Contents
                            Title Page
0. Foreword
1. Scope
2. Terminology
3. Necessary Information
4. Materials, Tools and Accessories
5. Storage of Materials
6. Care of Tools and Accessories
7. Design Considerations
	Table 1
	Table 2
8. General Precaution in Plastering
9. Preliminary Programming of Work
10. Sequence of Operations
11. Preparation of Plaster
12. Preparation of Background for Application of Plaster
13. Application of Undercoats
14. Application of Finishing Coat
15.Trueness of Plastering System
16. Curing
17. Inspection and Diagnosis
18. Plastering Defects and their Remedies
19. Maintenance
                        
Document Text Contents
Page 1

IS 1661 : 1972
( Reaffirmed 1987 )

Indian Standard

CODE OF PRACTICE FOR
APPLICATION OF CEMENT AND

CEMENT-LIME PLASTER FINISHES

( First Revision )

Fifth Reprint SEPTEMBER 1996

UDC 693.621 : 69.001.3

0 Copyright 1972

BUREAU OF INDIAN STANDARDS
MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

Gr 7 August 1972

Page 2

IS : 1661.1972

Indian Standard

CODE OF PRACTICE FOR
APPLICATION OF CEMENT AND

CEMENT-LIME PLASTER FINISHES

( First Revision )

Flooring and Plastering Sectional Committee, BDC 5

Chairman

SHRlO.P.MTTAL

Members
DR D. BANERJEE

DR M. L. BHAUMIK ( Alt6mat6 )
SnmA.K. BHATTACHARYYA

LALA G. C. DAM ( A~tcmntc )
SHRI S. K. BOSE

MAJ D. D. SHARMA ( Ahnot )
SHRI DWESH A. C~oxsxir

Directorate General of Posts and Tekgraphs, New
Delhi

National Rubber Manufacturers Ltd, Calcutta

National Test House, Cakutta

Engineer-in-Chief’s Branch, Army Headquarters

Arcoy Industries, Ahmcdabnf
SHRI RWIKLALA.CHOKSHI( Alkmats)

DEPUTY CHOP MECHANICAL EN~I- Ministry of Railways
NEER, INT~ORAL COACHFACTORY,
PERAYBUR
D~~~~~I~~s$-),

.%ANW& OROANIZAT~:~
LuoKNow ( Alt6mat6 )

DIRS~OR Maharashtra Engineering Research Institute,
NaSik

RE.%%RM OFFICZR, MATERIAL
T-NO D~VZUON ( Altemak )

SHRI P. K. DOTTER Concrete Association of India, Bombay
Ssxax L. T. GRHANI Bhor Industries Ltd, Bombay

SHRI RAMESH D. PATBL ( Altmati )
SHRI N. HARILAL

DR PRANLALPATEL( Alternate)
Oxychloride Flooring Products Ltd, Bombay

Smr S. C. KAPOOR Modern Tiles & Marble, New Delhi
SHRI A. C. KAP~~R (Al&m&)

SRRI M. R. b’fALYA BurmahShell Oil Storage St Distributing Co of

DR B. S. Bws~ ( Altmutr )
India Ltd, Bombay

( Continud on pug6 2 )

BUREAU OF INDIAN STANDARDS
MANAK BI-IAVAN, 9 BAHAIXJR SHAH ZAFAR MARC

NEW DELHI 110002

Page 15

Is : 1661-1972

TABLE 2 RECOMMENDED PLASTER SPECIFICATIONS

( Clauses 7.3.3 and 7.4.1 )

(1)

i)

No. OF COAT OF %UATION MS THICKN~~
PLASTER ( Proportion by

Volume )

(2) (3) (4) (5)

Single coat plaster Both internal and 1:0:3 10 to 15 mm
external 1:0:4

1:0:6
1:1:6
1:2:9

ii) Two coat plaster:

a) Backing coat

b) Finishing coat

do

1:0:3 10 to 12 mm
1:0:4
1:0:6
1:1:6

1:0:3 to 6 3to 8mm
1:1:6
1:2:9

iii) Three coat plaster: Very rough sur-
face; both
internal and
external

a) Base coat

b) Second coat

c) Finishing coat

1:0:3 10 to 15 mm
1:0:4
1:0:6
1:1:6

1:0:3 to6 3 to 8 mm
1:1:6
1:2:9

Fat lime and fine 3 to 5 mm
sand or marble
dust in equal
proportions

Norm 1 -Where two or three coat plasters are adopted, as far as possible the mix for
the under coats should contain coarse sand conforming to grading zone II of IS : 383-
1970t and having fineness modulus not less than 2.0.

Nora 2 -For single coat plaster the fineness modulus of sand should be as far as
possible 1.5 and conforming to grading zone IV of IS: 383-1970t. Where only fine
sand is available the fineness modulus of sand may be improved by mixing the required
percentage of coarse sand. The strength of plaster mix gets reduced with the reduction
in the tincness modulus of sand.

Norx 3 -Other mikes of cement/lime and sand may also be adopted depending on
the quality of sand available and local conditions provided the strength conforms to any
of the above mixes given in Table 2.

*Cement : lime : sand.
t+cification for coarse and fine aggregates from natural sources for concrete ( second

revision ) .

14

Page 29

IS t 16610 1972

18.2.9 Recurrent Surf&e Dampness - The presence of deliquescent salts as
occur in sea-water will bring about recurrent dampness in plaster dnisha
when the atmospheric humidity is high. It may also be eau+d by
condensation of moisture in chimney flues with a permeable lining, for
example, where slow combustion stoves are employed.

18.2.10 Soj%tess or Chalkiness - This may result from excessive suction of
the background, undue thinness of the finishing coat, working past the
setting point, or subsequent exposure of the finishing coat to excessive heat
or draught during settmg.

19. MAJNTJ3NANcE

19.1 Plastering work shall be protected at all stages of its life from
persistent attack by water or moisture either through the undercoats or
through the outer surface. The matter is particularly important during the
interval between plastering and decorating. Subsequent decoration on the
whole surface may be vitiated by a persistent stream of water down on
particular part due to flooding of upper floors under construction, delay in
provision of gutters, etc. Thus would be particularly serious if conditions
are favourable to formation of efflorescence. In extreme cases, the
plaster surface may be softened or badly channelled, necessitating local
repair.

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