Beam Span Flat Roof Truss Span Tables

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.

Beam span flat roof truss span tables.

Flat the most economical flat truss for a roof is provided when the depth of the truss in inches is approximately equal to 7 of the. Span tables for flat roof joists to bs 5268 7 2 imposed loads of 0 75 kn m for maintenance and snow load are applicable where there is no permanent access no fixed ladder or staircase and most areas where the altitude does not exceed 100 metres refer to bs 6399 3. This is set by the roof use you selected in the previous screen and cannot be modified. Posts these span tables are designed for a minimum post size of 50 x 50 x 2 5mm up to a maximum height of 3 0m.

Maximum rafter spans for a patio roof in areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. 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. For example a 5 12 2 12 combination has approx.

Loads are calculated in accordance with table 3 1 of as nzs 1170 1 2002. Roof pitch use recommended minimum roof pitches as specified by roof sheet supplier. 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. Headers beams.

Also available for the android os. Roof truss span tables alpine engineered products 15. 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. Should refer to trada document span tables for solid timber members in floors ceilings and roofs excluding trussed rafter roofs for dwellings or ask your lbc surveyor for advice.

For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. The same allowable span as a 6 12 3 12. Live load point load kn. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.

Tables 13 14.