Roof Rafter Spacing Uk

If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center.

Roof rafter spacing uk.

Surveyors span tables for designing roof rafters. Here the number is 941 86 inches. These spans were calculated using our flat roof joist calculation. 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 1166 66 inches. Roof rise this should be calculated from the base of the roof to the highest point of the roof gable the peak. Usually 400 450 or 600mm but any value can be used up to 610mm max are there any brittle finishes e g. Find the column for your dead load and spacing and the row for your timber size to find the permissible clear span in metres.

Builders aren t bound by standard rafter spacing measurements. Plasterboard on the underside of the rafter. Click on a span to generate a full calculation you can adjust the exact span. 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.

This span table is to the format and methodology given in bs 5268 7 2. Mm this is the distance between rafter centres. It is always better to have a large rafter rather than be concerned with a sagging roof. For pitched roofs flat roofs and ceiling joists.