BS EN 508-2:2009 pdf download – Roofing products from metal sheet — Specification for self supporting products of steel, aluminium or stainless steel sheet Part 2: Aluminium

BS EN 508-2:2009 pdf download – Roofing products from metal sheet — Specification for self supporting products of steel, aluminium or stainless steel sheet Part 2: Aluminium Reverse side painting or coating is used if being required for handling and storage reasons as well as for corrosion protection in some installation conditions. Performance and test methods for coil coated aluminium shall be in accordance with EN 1396. NOTE 3 Special coatings or films may be applied to the reverse side to reduce the dripping of moisture caused by condensation. 4.3 Products 4.3.1 Mechanical resistance The product shall resist the design loads from snow, wind and maintenance. These loads shall be factored such that they will not impair the performance of the roof. NOTE The load level, the levels of safety and permissible deflection are defined in national building regulations. 4.3.2 Calculation and tests of mechanical resistance The mechanical performance of the product shall be stated by the manufacturer, together with details of how the values were determined in accordance with the national regulations of the country where the product is to be used. NOTE 1 For calculation and testing either national regulations or EN 1999-1-4 may be used. NOTE 2 Calculation and test methods referred to in this EN mainly deal with trapezoidal sheets. Tiles, standing seam sheets and concealed fix sheets are used in proprietary roofing systems, no structural requirements are given within this standard for these products. These products should normally be designed by testing. 4.3.3. Dimensions 4.3.3.1 General The dimensions of the product shall be fixed in order that the roof constructed with these products can fulfil its functions. 4.3.3.2 Thickness Measurements of the thickness of manufactured products such as profiled sheets shall be made not less than 10 mm from the edges in accordance with EN 485-4. Products shall be classified according to tolerance on thickness as follows:  class 1: full minus nominal normal tolerance according to EN 485-4;  class 2: 1/2 minus nominal normal tolerance according to EN 485-4;  class 3: zero minus tolerance. NOTE 1 For products of class 3, mechanical resistance is calculated using the minimum thickness of the aluminium core guaranteed by the manufacturer. NOTE 2 National regulations will state the class of product that it will be possible to use. 4.3.4 Dimensional tolerances for the profiled sheet Tolerances for the profile shape of the product and methods of...