Timber Roof Beams Span Tables

The tables permit a bearing length of up to 3 5 inches but since 1 5 is probably the worst case that you ll encounter for joist or rafter bearing it s a safe value.

Timber roof beams span tables.

Single span beams are beams supported at two points only. Span tables f7 rafters a maximum roof pitch of 25 degrees is assumed. These tables are provided as a guideline. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.

Window door garage door headers supporting roof wall floor loads. Table specifications are provided with each table indicating conditions and assumptions used to calculate the loads. Span tables allow users to choose an appropriate size and stress grade to achieve spanning needs. Joist and rafter span tables.

For the purpose of using these tables span may be interpreted as the clear distance between supports measured along the beam. Tables providing size selections for various beam spans and loading combinations for southern pine dimension lumber and southern pine glued laminated timber are available for the following applications. The tables below give maximum spans for rafters and beams. In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot.

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. Continuous span beams are beams supported at three or more points along their length. Span tables use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. Specific beam designs should be reviewed by a licensed design professional.

Construction details should be in accordance with as1684 2. Table 9 1 in span tables for joists and rafters figure 5 gives a required compression value of 237 psi for a span of 16 feet and bearing length of 1 5 inches. Other more complex load condition spans can be determined with our free hyne timber design 7 5 software. Simplified span tables for southern pine lumber and glued laminated timber glulam headers beams and girders.

View allowable load tables. Also available for the android os. Technical diagram on page 35 30mm m aximum allow able sp ans mm sheet roof spacing mm rafter size 600 760 900 1000 1200 66 x 30 850 750 700 700 600 90 x 30 1200 1050. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.

Span calculator for wood joists and rafters also available for the android os. The figures are based on quality materials. Aitc capacity tables provide the uniformly distributed load that a glued laminated timber beam can support based on beam size span and material properties. View joist rafter tables.