Pitched Roof Rafter Spacing

For roofs that will experience heavy snow or wind and will span the same distance use 2 6 rafters.

Pitched roof rafter spacing. Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch. Typical rafter spacing codes will specify a minimum spacing of 16 inches 19 2 inches or 24 inches. For standard shed roof rafter spacing see rafter span chart. If you get premium kiln dried lumber then you could span 10 5 with the same size of lumber and.

Rafters must be strong enough to hold the roof sheathing and the shingles. Roof pitch between 15 and 22 5 degrees with rafter spacing strength class c16 size of rafters in mm 400mm 450mm 600mm. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. For pitched roofs flat roofs and ceiling joists.

Maximum rafter spans for a patio roof in areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. The spacing between rafters in a given building is part of the engineering calculations that determine the required structure of the roof. For roofs that won t experience heavy snow loads a gable roof can span up to 22 with 2 4 rafters. If your local building authority has a rafter spacing code you may not space rafters wider than required by code.

Surveyors span tables for designing roof rafters. There is no standard spacing it depends on what size of rafters you want to use and the span of your shed. You can use either 2 6 or 2 4 rafters for roofs with a 3 12 pitch or greater but it depends on the overall size of your shed. Surveyors and structural engineers utilise data from tables below to help calculate the correct size strength and centres of roof timbers for the required spans and loadings.

Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. Other relevant factors include the type of wood being used for the rafters the size of the rafters and the load that the rafters need to support. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. For instance 2 grade 2x4s at 16 on center will span just over 9.