![]() Flat roofs should be designed to drain the roof to one or two edges towards gutters and outlets. Gutters and downpipes should be adequately sized to deal with storm conditions in accordance with BS EN 12056-3. ![]() The firrings may also provide the fall by each one decreasing in thickness along the slope of the roof. These firrings should be the same width and length of the joists. The required fall is then formed using strips of tapered shaped timbers known as firrings fixed along the tops of the joists before the deck is laid. It is normal practice for the joists of a flat roof to be set level thus creating a perfectly level ceiling. The fall of the roof may be created in the structure itself by laying the supporting beams, or joists at a slope (giving a sloping soffit) or by installing tapered beams with horizontal soffits. The desired fall may be created in one of the following ways:
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January 2023
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