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3.13 RESTRICTION OF SPREAD OF FLAME OVER SURFACES OF WALLS AND CEILINGS

3.13.1 Requirements for Class 0

Any reference to a surface being Class 0 shall be construed as a requirement that:

a. the material of which the wall or ceiling is constructed shall be non-combustible throughout, or

b. The surface material (or, if it is bonded throughout to a substrate, the surface material in conjunction with the substrate) shall have a surface of Class 1 when tested to BS 476: Part 7 and if tested in accordance with BS 476: Part 6 shall have an index of performance (I) not exceeding 12 and a sub-index (i1) not exceeding 6.

R Rationale - Clause 3.13.1b

BS 476: Part 6 refers to a standard fire test for propagation of products. Under this test, there is a means of comparing the contribution of combustible building materials to the growth of a fire by providing a measure of the rate of heat evolution of the samples, exposed in a small combustion chamber.

3.13.2 Requirements for a class other than Class 0 classification

R Rationale - Clause 3.13.2

BS 476: Part 7 refers to a standard fire test for the classification of the surface spread of flame of products. This test is able to determine the tendency of surfaces of flat material to support the spread of flame across their surfaces and specifies a method of classification appropriate to wall and ceiling linings. Class 0 represents the best performance, followed in ascending order by Class 1, Class 2, Class 3 and Class 4. This clause is rephrased for clarity.

Any reference to a surface being of a class other than Class 0 shall be taken as complying with the relevant test criteria as to surface spread of flame specified in relation to that class in BS 476: Part 7.

3.13.3 Classification

R Rationale - Clause 3.13.3 The reason of having Class 0 standard is that Class 1 standard covers too wide a range of performance for use in critical areas. Where a higher degree of protection is required, Class 0 standard is necessary.

Class 0 shall be regarded as the highest class followed by Class 1 as set hereunder:

a. Class 0 - Surface of no flame spread. Such surfaces shall conform to the requirements of Cl.3.13.1.

b. Class 1 - Surface of very low flame spread. This refers to surfaces on which during the first 1½ mins of test, the spread of flame does not exceed 165mm and the final spread of flame does not exceed 165mm under the relevant test conditions.