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Home Roofing Roofing - flat roofs |
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Roofing - Flat Roofs
Flat roofs are constructed basically with roof joists spanning the gap between two walls, covered by sheet timber or other material. In the case of timber a further, waterproof roof cover is required. The weight of these last two coverings, together with the span, form the basis of the calculation for the size of roof joists required. A further part of this equation is discovered in Approved document A of the Building Regulations (Structure) where the possible roof snow loadings, depending on area of the country and height above the ordinance datum, are taken into consideration. It is therefore important, before building your structure that you have the desired building regulation approval. There are 8 “maximum span” tables in the regulations, which deal with the loading and span of the flat roof together with any slight pitch over 10 degrees that it may have to dispose of rainwater.
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