Roof Rafter Spacing Uk

Here the number is 941 86 inches.

Roof rafter spacing uk.

Surveyors span tables for designing roof rafters. 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. But they do tend to space rafters in one of several industry standard increments typically either 12 16 or 24 inches apart. Find the column for your dead load and spacing and the row for your timber size to find the permissible clear span in metres.

Usually 400 450 or 600mm but any value can be used up to 610mm max are there any brittle finishes e g. It is always better to have a large rafter rather than be concerned with a sagging roof. Click on a span to generate a full calculation you can adjust the exact span. These spans were calculated using our flat roof joist calculation.

Roof rise this should be calculated from the base of the roof to the highest point of the roof gable the peak. 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. For pitched roofs flat roofs and ceiling joists. Mm this is the distance between rafter centres.

Builders aren t bound by standard rafter spacing measurements. Here the number is 1166 66 inches. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. This span table is to the format and methodology given in bs 5268 7 2.