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IS0
I NT ERN AT1 ON AL O RG A N IZATl ON
FOR STAN DA RDl ZATl O N
IS0 RECOMMENDATION
ASYMMETRICAL SECTION CORRUGATED SHEETS
IN ASBESTOS-CEMENT FOR ROOFING AND CLADDING
1st ED IT1 ON
November 1964
COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Copies to be obtained through the national standards organizations.
Also issued in French and Russian.
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BRIEF HTSTORY
The IS0 Recommendation R 394, Asymmetrical section corrugated sheets in usbestos-
cement jor roofing und cladding, was drawn up by Technical Committee ISO/TC 77,
Products in asbestos-cement, the Secretariat of which is held by the Association Suisbe
de Normalisation (SNV).
Work on this question by the Technical Committee began in 1958 and led, in 1963,
to the adoption of a Draft IS0 Recommendation.
In December 1963, this Draft IS0 Recommendation (No. 692) was circulated to all
the IS0 Member Bodies for enquiry. It was approved, subject to a few modifications of
an editorial nature, by the following Member Bodies:
Australia Israel Republic of South Africa
Austria Italy Romania
Belgium
Japan Spain
Colombia Lebanon Sweden
Denmark Morocco Switzerland
Finland
Netherlands Turkey
France
New Zealand U.A.R.
Germany Norway United Kingdom
Greece Poland U.S.S.R.
Hungary Portugal Venezuela
Yugoslavia.
Ireland
Three Member Bodies opposed the approval of the Draft:
Brazil, Mexico, Peru.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0
Council, which decided, in November 1963, to accept it as an IS0 RECOMMEND-
ATION.
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E
ISO/R 394 . 1964 (E)
CONTENTS
Pages
1.Scope . 4
2 . Asymmetrical section corrugated sheets . 4
2.1 Composition . 4
2.2 Classification . 4
2.2.1 Geometrical classification . 4
2.2.2 Mechanical classification . 5
2.2.3 Choice of the classifications . 5
2.3 General appearance and finish . 5
2.4 Characteristics . 6
2.4.1 Geometrical characteristics . 6
2.4.1.1 Profiles and sizes . 6
2.4.1.2 Length, width and coverage . 6
2.4.1.3 Thicknesses . 6
2.4.1.4 Tolerances on the nominal dimensions . 6
2.4.2 Mechanical characteristics . 6
2.4.3 Physical characteristics . 6
2.4.3.1 Impermeability . 6
2.4.3.2 Frost cracking . 6
2.5 Tests . 7
2.5.1 Measurement of the thicknesses . 7
2.5.2 Bending tests . 7
2.5.2.1 Bending test on test pieces - Unit bending stress . 7
2.5.2.2 Bending test on whole sheets - Classifying index . 8
2.5.3 Impermeability test . 9
2.5.4 Frost cracking test . 9
2.6 Marking . 9
3 . Fittings . 9
3.1 Composition . 9
3.2 General appearance and finish . 9
3.3 Characteristics . 9
3.3.1 Geometrical characteristics . 9
.
3.3.1.1 Shapes . 9
3.3.1.2 Length, width and coverage . 10
3 3.1.3 Thickness . 10
3.3.1.4 Tolerances on the nominal dimensions . 10
3.3.2 Physical characteristics . 10
3.3.2.1 Impermeability . 10
3.3.2.2 Frost cracking . 10
3.4 Marking . 10
4 . Sampling. inspection and acceptance . 10
4.1 Inspection of each item of the consignment . 10
4.2 Inspection by sampling . 11
Appendix A . Testing . 13
Appendix B . Extracts of IS0 Recommendation R 390 " Sampling and Inspection
of Asbestos-Cement Products " . 14
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ISO/R 394 - 1964 (E)
IS0 Recommendation R 394 November 1964
ASYMMETRICAL SECTION CORRUGATED SHEETS
IN ASBESTOS-CEMENT
FOR ROOFING AND CLADDING1
1. SCOPE
I
This Recommendation applies to straight or curved asymmetrical section corrugated sheets
and fittings in asbestos-cement without any metallic reinforcing media, to be used for roof-
ing and cladding.
It defines certain conditions of manufacture, dimensions and acceptance tests for these
products.
2. ASYMMETRICAL SECTION CORRUGATED SHEETS
2.1 Composition
The sheets are made from a close and homogeneous mixture essentially consisting
of a suitable inorganic hydraulic binder, asbestos fibre and water, excluding any
materials liable to cause ultimate deterioration in the quality of the sheets.
The sheets may be left in their natural colour or colouring matter may be added in
the composition ; they may also receive adherent coloured or uncoloured coatings on
their surfaces.
2.2 Classification
The sheets are classified both according to the height of their corrugations and accord-
ing to their load bearing capacity.
2.2.1 Geometrical classiJication
(Classification according to the height of the corrugations)
DEFINITION - The height h of the asymmetrical corrugations is the height measured
from the flats separating the corrugations to the crowns of the adjacent corrugat-
ions (see Figure 1). This dimension includes one thickness only.
Fig. 1
1 Symmetrical corrugated sheets are covered by Recommendation ISO/R 393.
a This Recommendation also applies to autoclaved sheets when the binder is partially replaced by ground silica.
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ISO/R 394 - 1964 (E)
DESIGNATION OF THE CATEGORY
(1 ) deep corrugations
height not less than 42 mm
(2) medium corrugations
height less than 42 mm
and not less than 30 mm
(3) shallow corrugations
height less than 30 mm
and not less then 15 mm.
2.2.2 Mechanical classiJication
(Classification according to the load bearing capacity)
DEFINITION - The sheets are classified according to t Ar load bearing capacity
(2.5.2.2), on the condition that the minimum unit stress value of 200 kgf/cm2
measured on test pieces that defines the intrinsic quality of the asbestos-cement
material, provided for in 2.4.2, is maintained.
The classifying index C,,, represents a minimum acceptable load bearing capacity
related to a width of one metre.
DESIGNATION OF THE CLASS
(1) class 150 C,n: 150 kgf/m
(2) class 212 Cnt: 212 kgf/m
(3) class 300 Cni: 300 kgf/m
(4) class 425 C,: 425 kgf/m.
One lower class may be introduced into this classification; it has to be chosen from
the same series of preferred numbers as the classes above.
2.2.3 Choice oj the classifcations
The national standards may prescribe one or other or both the above classifications.
(a) In order to facilitate the interchangeability of the sheets and consequently
to ensure the tightness of the roofs when matching sheets, a sheet should
keep within the category of its geometrical profile irrespective of its mini-
mum load bearing capacity.
It is not permissible to change the class according to the minimum accept-
able load bearing capacity of a sheet as determined by 2.2.2, even if the
verification of bearing capacities carried out according to 2.5.2.2 indicates
an index corresponding to a higher class than the classifying index C,,, for
the sheet.
2.3 General appearance and finish
The sheets are elements the cross section of which presents a succession of linear
portions and corrugated portions so arranged to make the sheet rigid. The surface
intended to be exposed to the weather should be finished smooth.
The edges of the sheets should be square, straight and clean.
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lSO/R 394 - 1964 (E)
2.4 Characteristics
2.4.1 Geometrical characteristics
2.4.1.1 PROFILES AND SIZES
The profiles and sizes of the sheets should conform to those in the national
standards of the producing country or, failing this, should be as specified in
the manufacturers’ catalogues.
2.4.1.2 LENGTH, WIDTH AND COVERAGE
These nominal dimensions should conform to those in the national standards
of the producing country or, failing this, should be as specified in the manufact-
urers’ catalogues.
2.4.1.3 THICKNESS
The nominal thickness of the sheets should conform to that in the national
standards of the producing country or, failing this, should be as specified in the
manufacturers’ catalogues.
The actual thickness measured according to 2.5.1 should at no point be less
than 5.5 mm for those sheets of the categories (2.2.1) “ deep ” and “ medium ”
corrugations, and 3.5 mm for those sheets of the category “shallow” cor-
rugations.
2.4.1.4 TOLERANCES ON ïHE NOMINAL DIMENSIONS
(a) on the length
Upper deviation: + 5 mm
Lower deviation: - 10 mm.
(b) on the width
Upper deviation: t 10 mm
Lower deviation: - 5 mm.
(c) on the thickness
Upper deviation : free
Lower deviation: - 0.5 mm.
2.4.2 Mechanical characteristics
Tested as provided for in 2.5.2.1 (compulsory test), the sheets should give a mini-
mum unit bending stress of 200 kgf/cm2.
2.4.3 Physical characteristics
2.4.3.1 IMPERMEABILITY
Tested as provided for in 2.5.3 (optional test), traces of moisture may appear
on the lower surface of the sheets, but in no instance should there be any
formation of drops of water.
2.4.3.2 FROST CRACKING
Tested as provided for in 2.5.4 (optional test), the sheets should not show
signs of cracking or surface alteration.
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ISO/R 394 - 1964 (E)
2.5 Tests
The acceptance tests should be carried out at the manufacturer’s works on sheets and
test pieces cut off the sheets which the manufacturer guarantees to be sufficiently
matured.
(U) Compulsory tests
I. Measurement of the thicknesses (method as defined in 2.5.1).
2. Bending tests (methods as defined in 2.5.2.1 and 2.5.2.2, number of tests as
indicated in the extract of the table in Appendix B).
(hl Optional tests at purchaser’s request
3. Impermeability test (method as defined in 2.5.3, number of tests as indicated
in the extract of the table in Appendix B).
4. Frost cracking test (method as defined in 2.5.4, number of tests as indicated
in the extract of the table in Appendix B).
2.5.1 Measuaenzent of the thicknesses
The methods of assessing these measurements and the instruments used should
be in accordance with the national standards of the producing country.
The actual thickness measured at any point should be not less than the minimum
provided for in 2.4.1.3.
2.5.2 Bending tests
2.5.2.1 BENDING TEST ON TEST PIECES - UNIT BENDING STRESS
This test serves to determine the unit bending stress of the material of the sheets.
off the linear portions of the sheets and
It is carried out on flat test pieces cut
on which the direction of the corrugations should be marked. These test
pieces should be 25 cm long taken from the sheet length and be as wide as
possible governed by the dimension of the linear portions in the sheet width,
but limited to 20 cm. Before testing the test pieces should be immersed in
water for 24 hours.
The test piece should be placed on two parallel supports with edges rounded
at a radius of 3 mm, leaving between them a clear span of 21.5 cm, the supports
being at right angles to the direction indicated by the marks. It should be
loaded at mid-span by means of a piece of the same shape and parallel to the
supports, the surface which is intended to be exposed working under com-
pression.
The speed of application of the load should be regulated so as to realize an
increase of the unit stress of about 10 kgf/cm2s up to breaking point.
The unit bending stress expressed in kilogrammes-force per square centimetre
is given by the formula:
M
Ry =
3 When national standards provide for a constant speed of application of the load, it should be of about
0.100 kgf/cm width per second up to breaking point.
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ISO/R 394 - 1964 (E)
where
PI
M=-
4
P = breaking load, expressed in kilogrammes-force
I = clear span between the supports, expressed in centimetres
e = actual thickness of the test piece in the breaking section, expressed
in centimetres
b = actual width of the test piece, expressed in centimetres.
The unit bending stress R, should be not less than 200 kgf/cm2.
2.5.2.2 BENDING TEST ON WHOLE SHEETS - CLASSIFYING INDEX
This test serves to verify the classifying index C,, according to the classification
by the load bearing capacity.
It includes a test on a sheet placed in its normal conditions of use (" normal ")
and a test on another sheet placed in the reversed position ( " reversed ").
The test is carried out on straight sheets of a minimum length of 1.22 m.
Before testing they should be immersed in water for 24 hours.
Fig. 2
The sheet should be placed on two transverse fixed rigid flat parallel supports
5 cm wid
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