Applicability criteria for pitched roof timber tables

The tables for the pitched roof timbers are only applicable to a building where no access is provided to the roof, other than that necessary for cleaning and maintenance, which has – (a) a roof area not greater than 200 m2 in plan; or (b) a width not greater than 10 m and a pitched roof with no parapet, provided that there are no other buildings within 1.5 m of its perimeter, and provided the roof configuration also meets one of the following conditions – (i) the roof has no abrupt changes of height greater than 1 m, at which a drift of snow could occur; or (ii) the area of a lower part of the roof, on which a drift of snow could form, is not greater than 35 m2.