Roof Rafter Sizes Uk

Rafter slope min 15 max 45 degrees.

Roof rafter sizes uk.

Span tables for purlin supporting rafters to bs 5268 7 6 imposed loads of 0 75 kn m snow load are applicable to most areas where the altitude does not exceed 100 metres refer to bs 6399 3 imposed loads of 1 kn m snow load are applicable to most areas where the altitude exceeds 100 metres but does not exceed 200 metres but excluding. Maximum clear span of rafters in metres for roof pitches of between 15 and 45 degrees roof pitch between 15 and 22 5 degrees with rafter spacing strength class c16 size of rafters in mm. For pitched roofs flat roofs and ceiling joists. Rafter run outer wall this should be measured starting from the center of the roof span and then extending to the very edge of the exterior wall.

Here the number is 941 86 inches. The full version allows any size. This calculator helps you make the rafters of the suitable sizes required for your roofing. To establish the rafter length we calculate the following.

This demo version is fixed at 1m clear span. It is one of a series of sloped structural members that extend from the ridge or hip to the wall plate designed to support the. Just enter the dimensions of the roof rise and run to get started. 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.

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. Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run. Roof rise this should be calculated from the base of the roof to the highest point of the roof gable the peak. Clear span on plan.

Surveyors span tables for designing roof rafters. Here the number is 1166 66 inches. There could be many rafters supporting a roof. Usually 400 450 or 600mm but any value can be used up to 610mm max.

This is the distance between rafter centres. 2 4 x 1 1034 refer to image to the right 2 65. Rafter is a sloping beam usually wood that supports a pitched roof. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center.

2 175m is your rafter length.