BS EN 492-2004 pdf download.Fibre-cementslates and fittings – Product specification and test methods.
On exposure the surface andlor its Coating will be affected by weathering WhICh may vary with site location, aspect, pitch of roof and duration of exposure. Any deterioration in this respect shall not detract from the minimum mechanical and physical characteristics as specified in this document or from the function of the fibre-cement slate as a durable element.
The fittings shall have a general appearance and finish compatible with the fibre-cement slates with which they are to be used. They may be supplied with holes for fixing.
5.2 Dimensions and tolerance
5.2.1 General
The manufacturer shall specify the shapes, sizes and configuration of edges.
NOTE See 5.6 for designation and information.
Fittings shall have nominal dimensions and shapes determined by the manufacturer and appropriate to the
corresponding fibre-cement slates.
5.2.2 ThIcknesses
The actual fibre-cement slate thickness determined in accordance with 7.2 shall be not less than that shown in
Table 1.
The nominal thickness shall be specified by the manufacturer.
The nominal thickness of the fittings shall be not less than the corresponding nominal thickness of the fibre-
cement slates with which the fittings are to be used.
5.2.3 Tolerances on nominal dimensions
The maximum dimensional variation when measured as specified in 7.2 shall be as follows:
Length and width: ± 3 mm
Thickness: ‘ % of the nominal value.
For fittings that replace fibre-cement slates (e.g. ventilation fibre-cement slates) the tolerances shall be the same as those on the fibre-cement slates.
For other fittings (e.g. ridges) the tolerances shall be specified by the manufacturer.
5.3 Physical requirements and characteristics for fibre-cement slates
5.3.1 General
5.4.3 Heat-rain
When tested in accordance with 7.4.2, after 50 heat-rain cycles any visible cracks, delamination or other defects in the fibre-cement slates shall not be of such degree as to affect their performance In use.
(a) Water tightness is assessed according to 5.3,4.
(b) Warping and bowing are visually assessed.
5.4.4 Warm water
When tested in accordance with 7.3.4, after 56 days at 6crC. me ratio IL as aefined an 1.3.4.4 snaii be not less than 0,75.
5.4.5 Soak-dry
When tested In accordance with 7.3.5, after 50 soak-dry cycles the ratio RI as defined in 7.3.5.4 shall be not less than 0,75.
5.5 Fire and safety
5.5.1 External fire performance
When subject to regulatory requirements, the external fire performance of the slates shall be declared in
accordance with 7.5.1.
5.5.2 Reaction to fire
When subject to regulatory requirements. the reaction to fire of the slates or fittings shall be declared in accordance with 7.5.2.
5.5.3 Release of dangerous substances Fi Text deleted
For products containing substance(s) defined in Council Directive 76/769/EEC, the content shall be declared by the manufacturer.
This applies to substances contained in the original formulation or created during the manufacturing process. In addition see Annex ZA.
5.6 Product information
The designation of the fibre-cement slate shall include at least the following:
type of product NT (see 5.1.1):
— thickness,
length and width;
c) mirwmum apparent density;
d) Information relevant to the handling and installation.
6 Evaluation of conformity
6.1 General
The conformity of products with the requirements of this standard shall be demonstrated by:
— initial type testing; and
— factory production control by the manufacturer.
6.2 Type testing
6.2.1 General
Type tests shall be carried out on products as delivered. If several formats or sizes of the same nominal thickness are being produced from the same composition and by the same production method, type tests only need to be carried out on one size of each nominal thickness.
All characteristics listed in Table 2 shall be subject to initial type testing. except reaction to fire Class Al without testing and external fire performance deemed to satisfy products.
6.2.2 Initial type testing
Initial type testing shall be performed to demonstrate conformity to this standard. Tests previously performed in accordance with the provisions of this standard (same product, same characteristic(s), test method. sampling procedure, same attestation of conformity, etc.) may be taken into account, In addition, initial type testing shall be performed for the approval of a new product, or a fundamental change in formulation or method of manufacture, the effects of which cannot be predicted on the basis of previous experience.
The results of all type tests shall be recorded and held by the manufacturer for at least 5 years.
6.2.3 Further type testing
Whenever a change occurs in the fibre-cement slate design, the raw material or supplier of components, or the production process, which would change significantly one or more of the characteristics, the type test shall be performed for the appropflate characteristic(s).BS EN 492-2004 pdf download.