When it comes to roofs, covenants may require a specific roof pitch so your home blends in aesthetically with the rest of the homes in the development. CovenantsĬovenants are building codes that apply to a single development or subdivision, but covenants are just as enforceable as other local building codes. For instance, if your roof has a steep pitch, you may be able to use 2-inch by 4-inch rafters, but if your roof has a low pitch, building code may require that you used 2-inch by 6-inch, or 2-inch by 8-inch rafters. For low-pitch roofs, building codes may require larger dimension rafters. However, the maximum is determined by the species and grade of wood, the spacing, the load, and more. All we do now is use a calculator to multiply 1.610 by the measurement in the book: 1.1543 x 1.610 1.858m So, the rafter lengths 1. This means that for every 1m the rafter travels horizontally, the angled length of the roof will be 1.1543m. Finally, a single deck beam has a maximum span of 5’ 11 and double maxes out at 8’ 9. Trying to find what size lumber to use This is based upon the span of the rafter (horizontal span, not total rafter length), live and dead loads. The length of rafter per meter of run is 1.1543. As roof pitch is lowered, the weight burden on the rafters increases. The maximum span for roof rafters is 23’ 9. A span options calculator allows selection of multiple species and grades for. Local building code may also address rafter dimension, although this usually is considered in addition to roof pitch and span. Joists and rafter spans for common loading conditions can be determined. ![]() This may apply to all homes or just to homes with roofs designed to bear heavy tile or slate roofing shingles. ![]() ![]() Some communities require that rafters be made of a specific wood type, such as fir, as opposed to pine or spruce, for added roof strength.
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