Timber Roof Beam Sizes

Table specifications are provided with each table indicating conditions and assumptions used to calculate the loads.

Timber roof beam sizes.

Calculate the initial value for d then round it up to the nearest inch. Here s how to calculate the size of a timber beam you need to span a given distance. This tells you the size of the beam needed to support the porch s roof. Span tables allow users to choose an appropriate size and stress grade to achieve spanning needs.

This calculator matches up with 90 of the applications in the 2012 international residential code book. Pitched roof timber sizes. Most interior beams need to include the roof load. Our heavy timber beams are cut to standard dimensions.

Click on a span to generate a full calculation you can adjust the exact span. Find the column for your dead load and spacing and the row for your timber size to find the permissible clear span in metres. The following tables give details of the allowable spans and spacing for some of the more common timber sizes used in traditional roofing construction. A 8x12 beam will net an overall 7 x 11.

Starting from scratch with no previous knowledge of structures required. If there is are any questions about anything else then you should contact your supplier or an engineer. These tables are provided as a guideline. This means the example porch would need a 6 inch by 8 inch beam.

Aitc capacity tables provide the uniformly distributed load that a glued laminated timber beam can support based on beam size span and material properties. Stress grades and timber sizes combine to determine the spanning ability of load carrying members. In the example d calculates to 7 75. Per wwpa guidelines for standard dimension timbers a nominal 4 x6 timber nets to 3 x5 actual dimensions after it has been sawn all beams larger than 8 inch will mill to the inch.

Designing with roof rafter span tables lvl 2 0e 2900fb power beam anthony forest s co raising ceiling joists jlc roofdek manual structural roof decking and trays. These spans were calculated using our flat roof joist calculation. Aitc beam capacity tables. This span table is to the format and methodology given in bs 5268 7 2.

All the figures are based on roofing tiles or slates laid on timber laths over sarking felt.