Garage Roof Timber Sizes

These spans were calculated using our flat roof joist calculation.

Garage roof timber sizes.

I love having a garage. Surveyors span tables for designing roof rafters. The following tables give details of the allowable spans and spacing for some of the more common timber sizes used in traditional roofing construction. It is often compared to slope but is not exactly the same.

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. For pitched roofs flat roofs and ceiling joists. Discover the standard garage dimensions and sizes here for 1 2 3 and 4 car garages. Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run.

Find the column for your dead load and spacing and the row for your timber size to find the permissible clear span in metres. Maximum clear span of flat roof joists in metres for sc3 timber spacing between joists size of roof joist 400mm 450mm 600mm 47 x 97 1 84 1 81 1 74 47 x 120 2 43 2 39 2 27 47 x 145 3 08 3 02 2 87 47 x 170 3 75 3 67 3 42 47 x 195 4 41 4 31 3 92 47 x 220 5 04 4 85 4 41 75 x 170 4 50 4 38 3 99. 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. You will need to continually measure the roof span and ensure that the size is ok with the building plan and project.

This span table is to the format and methodology given in bs 5268 7 2. 1 2 timber strength class and joist size automatically calculate sizes suitable for supporting the loads below c16 cost effective for most applications c24 stronger more demanding c14 c18 c22 c27 c30 c35 c40. 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. We set out illustrated diagrams setting out all key dimensions including width depth and more.

The first step in creating your roof trusses is to cut down the timber panels to the size that you want for your garage roof. Pitched roof timber sizes. The previous 3 homes i lived in i did not have a garage.