![]() ![]() All we do now is use a calculator to multiply 1. This means that for every 1m the rafter travels horizontally, the angled length of the roof will be 1.1543m. Douglas fir maximum horizontal roof rafter span for Lumber Grade Selected Structural. #Rafter tables codeFor all other situations click here for quick reference in the code book. The length of rafter per meter of run is 1.1543. Douglas Fir in horizontal roof rafters and maximum spans. applications according to the 2018 International Residential Code. Rafter slope (min 15, max 45) degrees Rafter spacing mm This is the distance between rafter centres. ![]() The following tables give details of the allowable spans and spacing for some of the. applications according to the 2018 International Residential Code. Timber sizes and construction details for pitched and rafter roofs. These rafter span tables provide the best reference to quickly and easily determine the maximum span for all grades of southern pine according to the 2018 International Residential Code. ![]()
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