1s 13317 : 1992

( Reaffirmed 1997 )
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:* Indian Standard
CLAYROOFINGCOUNrRYTILES,HALF
ROUNDANDFLATTILES-SPECIFICATION

UDC 666’762’2

@ BIS 1992

BUREAU OF INDIAN STANDARDS

MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002

March 1992 Price Group 2

-
Clay Products for Buildings Sectional Committee, CED 30

FOREWORD

This Indian Standard was adopted by the Bureau of Indian Standards, after the draft finalized by
the Clay Products for Buildings Sectional Committee had been approved by the Civil Engineering
Division Council.

Clay roofing country tiles, half round and flat tiles are used in large scale in different parts of the
country. Different practices for the manufacture of tiles are being adopted in the country and
with a view to improve the manufacturing operations and utilizing the existing knowledge and
experience gained in the manufacture of better quality of tiles, this standard has been prepared to
unify the practice followed and to guide the producer of burtt clay roofing country tiles.

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,

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 with IS 2 : 1960 ‘Rules for rounding off numerical values ( revised)‘. The
number of significant places retained in the rounded off value should be the same as that of the
specified value in this standard.
 IS 13317 : 1992

Indian Standard
CLAYROOFING COUNTRYTILES,HALF
ROUNDANDFLATTILES-SPECIFICATION
1 SCOPE ( Fig. 1 ). The tolerances in length and width
are given in 6.2.
1.1 The standard covers the specifications of
hand made half round and flat country tiles. 61.1 The overall minimum overlap in both the
type of tiles shall be 60 mm length wise. There
2 REFERENCES is no overlap width wise in these tiles.
2.1 The Indian Standard mentioned below is 6.2 Tolerances
necessary adjuncts to this standard:
The tolerances in length and width shall be
IS No. Title below f 5 percent.
2248 : 1991 Glossary of terms relating to
6.3 Weight
clay products for building
( second revision ) The average weight of the six half round and
six tlat tiles when dried at 105” to 110°C to
3 TERMINOLOGY constant weight and weighed shall be not less
than 5 N ( 0’5 kg for half round tiles ) and 7 N
3.1 For the purpose of this standard, the ( 0’7 kg for flat tiles ) and not more than 8 N
definition of terms given in IS 2248 : 1991 ( 0.8 kg for half round tiles ) and 10 N ( 1 kg
shall apply. for flat tiles ).
4 CLASSIFICATION 6.3.1 The weight of tile shall be noted to the
4.1 Half round and flat country tiles shall be nearest 0’05 N ( 0’005 kg ).
of two classes each, namely Class AA and
Class A and shall be classified as specified in 7 SAMPLING
Table 1. 7.1 The sample for testing shall be taken by the
purchaser or his representative or by any person
5 GENERAL QUALITY appointed to superintend the works for the
5.1 The roofing tiles shall be made from suitable purpose of which the tiles are required or by
clay of even texture and shall be well burnt. the latter’s representative.
They shall be free from irregularities, such as
twists, bends, cracks and laminations. 7.2 Lot
5.2 The roofing tile shall be free from impurities In any consignment all the tiles of the same
like particles of stone, lime or other foreign class and size and from the same bstch of
materials visible to the naked eye either on the manufacture shall be group:d iuto a minimum
surface or on the fractured face of the tile number of lots of 10 000 tiles or psrt th:reof.
obtained by breaking the tile. However, occa- 7.3 The number of tiles to be selected at random
.sional particles up to 2 mm in size may be from the lot shall depend upon its size and
permissible. When struck, the tile shall give a s:;Lie iz in accordance with co1 I and 2 of
characteristic ringing sound and when broken
the fracture shall be clean and sharp at the
edges. The Class AA tile shall be of uniform 7.4 N,nmber of Tests
colour.
7.4.1 All the tiles selected as in 7.3 shall be
5.3 Shape examined for shape ( see 5.3 ), dimensions
( see 6.1 ) and weight ( see 6.3 ).
When the half round or flat country tile is
placed on a plane surface, the gap at the corners 7.4.2 Eighteen tiles shall be selected out of
,shall be not more than 8 mm. The cross section those already examined as in 7.4.1, six each for
<ofthe half round and flat country tiles shall be water absorption test, breaking load test and
such as to give the tile structural rigidity. permeability test ( see 8 ).

6 DIMENSIONS AND TOLERANCES 7.5 Criteria for Conformity

7.5.1 The lot shall be considered as conforming
6.1 Dimensions to the requirements of the specification if th:
There shall be two sizes of these tiles with conditions mentioned under 7.5.2 to 7.3.5 are
principal dimensions as given in Table 2 all satisfied.

1
-_
 Half Round Tile ( Nalia ) Flat Type ( Kbopra )

Dimensions mm
r--------- ----- A-------- -----__
a C e
Half Round Tile
” SizeI 200 105 85 50 40
Size II 250 120 95 60 45
Flat Tile
Size I 200 175 145 20 20
Size II 250 200 160 25 25

FIG. 1 TYPICAL DETAILS OF COUNTRY ROOFING TILES AND

THIER LAYING PATTERNS

Table 1 Classification of Clay Country Roofing Tiles

( Clause 4.1 )
Sl No. Characteristic Reqoirement
r----------- --A---_----_--__~
Half Round Tile Flat Tile
_----- ------\ -----I------
Class AA Class A . ’ Class AA Class A
(1) (2) (3) (4) (5) (6)
i) Water absorption percent, Max 19 24 19 24
ii) Breaking load, kN, Min
a) Average 0.40 ( 40 kg ) 0.30 ( 30 kg ) 0.35 ( 35 kg ) 0.25 ( 25 kg
b) Individual 0.35 ( 35 kg ) 0.25 ( 25 kg ) 0.30 ( 30 kg ) 0.20 ( 20 kg )

Table 2 Dimensions of Tiles

( Clause 6.1 )
All dimensions in millimetres.
Sl No. Half Round Tile Flat Tile
C------ ~______,_~ c-------- A_----__~
Overall Overall Width Overall Overall Width
Length r_----*_-~ Length #---------,~
Wide end Narrow end Wide end Narrow end
(1) (2) (3) (4) (5) (6) V)
1) Size I 200 105 85 200 175 145
ii) Size II I 250 120 95 250 200 160

2
 IS 13317 : 1992

Table 3 Sample Size and Criterion 8 STRENGTH REQUIREMENTS

for Conformity 8.1 Water Absorption Test
The water absorption of tiles shall conform to
( CIause 7.3 ) the requirements laid down in Table 1, when
Lot Size Sample Size Permissible Number determined in accordance with the procedure
of Defective Tiles laid down in Annex A.
(1) (2) (3) 8.2 Breaking Load Test
up to 2 000 22 3
2 001 to 5 000 35 5 The breaking load of tiles shall conform to the
5 001 to 10 000 50 7 requirements laid down in Table 1, when
10 000 and above 80 10 determined in accordance with the procedure
laid down in Annex B.

7.5.2 The number of tiles failing to satisfy the 9 NON-COMPLIANCE WITH TESTS
requirements of any of the characteristics 9.1 If any of the rooting tiles in the sample fails
mentioned in 7.4.1 shall not exceed the to comply with the requirements of any of the
corresponding number given in co1 3 of tests specified in 8 another sample shall be
Table 3. similarly drawn and tested. If any of the tiles
in the second sample also fails to comply with
7.5.3 From the test results for water absorption, the requirements of tests specified in 8, then the
the average (X) and range (8) shall be calculat- whole lot from which the samples were taken be
ed. The value of the expression ( X + 0’5 R ) rejected as not complying with this standard.
shall be less than or equal to the corresponding 10 MARKING
limit given in Table 1.
10.1 Each roofing tile shall be legibly and
7.5.4 All the. individual values of breaking load indelibly marked with the indication of source
shall be above the corresponding minimum value of manufacture. The marking shall not cover
specified for individual in Table 1. The average more than five percent of the area of the
of the six test results shall be above the corres- specimen.
ponding minimum limit specified for the average 10.1.1 Each brick may also be marked with the
in Table 1. Standard Mark.

ANNEX A
( Clause 8.1 )
WATER ABSORPTION TEST

A-l TEST SPECIMEN A-3 EVALUATION AND REPORT OF TEST

RESULTS
A-l.1 Six tiles shall be used for this test from
the sample selected in the manner given A-3.1 The percentage water absorption shall be
under 6.
calculated using the following formula:
A-2 PROCEDURE
Percentage absorption = sB i A x 100
_-
A-2.1 Dry the six tiles selected in an oven at a
temperature of 105 to 110°C till they attain where
constant weight and then cool and weigh. When B = weight of the specimen after 24 h
cool, immerse the dry specimens completely in immersion in cold water, and
clean water at 24 to 30°C for 24 h. Remove each
specimen, wipe off the surface water carefully A = weight of the dry specimen.
with a damp cloth and weigh the specimen.
Weigh the specimen nearest to a gram within A-3.2 The average percentage water absorption
three minutes after removing the specimen from of the six tiles shall be calculated and reported
the tank. as the percentage water absorption.

3
IS 13317 : 1992

ANNEX B
( Clause 8.2 )
DETERMINATION OF BREAKING LOAD
,
B-l TEST SPECIMEN B-3 PROCEDURE
B-l.1 Six tiles shall be used for this test from
the sample selected in the manner as given B-3.1 Test three (half round and/or flat country
under 7. tile ) tiles after soaking in water at 27 f 2°C for .
24 hours in the wet condition and three tiles in
B-2 APPARATUS dry condition. Support the half round tile
evenly on tapered wooden plank so that the
B-2.1 The apparatus ( see Fig. 2A ) shall consist sprit level placed on half round tile indicate the
of a rigid m.s. plate of size 350 x 250 mm so as perfect horizontal line at all levels on which
to have free vertical movement with the help rigid upper steel bearer is placed ( Fig. 1 ). In
of a screw action operable with hand. The
country tile ( half round or flat ) shall be placed the case of flat country tile, plain plywood of
in the centre and the pressure is applied by the thickness 5 mm may be used for supporting the
upward movement of whole assembly with the inverted base of the tile ( Fig. 2 ). The steel
help of screw action. The load is measured in bearer is placed on the horizontal surface along
terms of prooving ring reading attached to the the mid length of the tile. Apply the load with
upper steel bearer ( half cut cylinderical section, the direction of the load perpendicular to the
rounded to 25 mm diameter ) ( Fig. 2B ) and horizontal upper line at the apex of the tile, at
placed mid way between middle line of tile a uniform rate of 200 to 250 N/min ( 20 to 25
along the length. kg/min ). The weight of the upper bearer must
he added to the ultimate breaking load of the
The loading shall be at a uniform rate of 200 to tile.
250 N/min ( 20 to 25 kg/min ) by the screw
action operated manually. The prooving ring B-4 EVALUATION AND REPORT OF TEST
( 1 000 kg capa.city ) reading is noted at the time RESULTS
of final breaking of tiles. The breaking load
value obtained in terms of prooving ring B-4.1 The individual breaking load of each of
reading is converted into load ( kg > and is the three tiles separately in wet and dry condi-
reported as breaking load strength. tion shall be recorded and the average calculated.

10011kgfPROVING
RING WITH 01-AL GAUGE

FOR VE!?TlCAL

2A Apparatus 2B Upper Bearing

FIG. 2 SET UP FOR BREAKING LOAD STRENGTH MEASUREMENTOF COUNTRY TILE
Standard Mark

The use of the Standard Mark is governed by the provisions of the Bureau ofIndian
Standards Act, 1986 and the Rules and Regulations made thereunder. The Standard Mark on
products covered by an Indian Standard conveys the assurance that they have been produced
to comply with the requirements of that standard under a well defined system of inspection,
testing and quality control which is devised and supervised by BIS and operated by the pro-
ducer. Standard marked products are also continuously checked by BIS for conformity to
that standard as a further safeguard. Details of conditions under which a licence for the use
of the Standard Mark may be granted to manufacturers or producers may be obtained from
the Bureau of Indian Standards.
Bureau oihdian Standards

BIS is a statutory institution established under the Bmau ofZndiun Standards Act, 2936 to promote
harmonious development of the activities of standardization, marking and quality certification of
goods and attending to connected matters in the country.

Copyright

BIS has the copyright of all its publications. No part of these publications rnly be reproduced in
any form without the prior permission in writing of BIS. This does not preclude the free use, in
the course of implementing the standard, of necessary details, such as symbols and sizes, type or
grade designations. Enquiries relating to copyright bs addressed to the Director (Publications ), BIS.

Revision of Indian Standards

Indian Standards are reviewed periodically and revised, when necessary and amendments, if any,
are issued from time to time. Users of Indian Standards should ascertain that they are in
possession of the latest amendments or edition. Comments on this Indian Standard may be sent
(to BIS giving the following reference :

Dot : No. CED 30 ( 4876 )

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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