Roof Rafter Sizes 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 sizes uk.

Rafter is a sloping beam usually wood that supports a pitched roof. 4 8 2 2 4 for one half of your roof s width b skip this step if you already know what measurement half the width of your roof is. Print full scale rafter plumb cut templates and birdsmouth templates fold template over rafter to mark or cut through. There could be many rafters supporting a roof.

Rafter slope min 15 max 45 degrees. For pitched roofs flat roofs and ceiling joists. Usually 400 450 or 600mm but any value can be used up to 610mm max. This demo version is fixed at 1m clear span.

This calculator helps you make the rafters of the suitable sizes required for your roofing. As a general rule roofs that have a high human occupancy rate should be framed with rafters every 16 structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes. Half building width minus 1 2 ridge thickness. See rafter run to outer wall calculator below.

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. 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. Clear span on plan. 2 4 x 1 1034 refer to image to the right 2 65.

2 175m is your rafter length. Here the number is 941 86 inches. Surveyors span tables for designing roof rafters. To establish the rafter length we calculate the following.

Allow for ridge thickness when determining rafter run to outer wall. The full version allows any size. Here the number is 1166 66 inches. 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.

Roof rise this should be calculated from the base of the roof to the highest point of the roof gable the peak.