Maximum Span Of Roof Trusses

Included are a series of representative roof truss span tables that will give you an idea of the truss spans available for a particular load condition load duration lumber type and truss configuration.

Maximum span of roof trusses.

Spans in excess of these. Maximum birdsmouth 1 3rd rafter depth 30 minimum. Trusses with an asterisk that exceed 14 in height may be shipped in two pieces. Spans standard trusses can be designed up to 11 metres in 35mm timber and 15 metres in 47mm timber.

Also available for the android os. 1 ft 0 3048 m. Live load is weight of furniture wind snow and more. Provision for creating extra.

You can use sbca s span charts to roughly determine truss sizes available. Dead load weight of structure and fixed loads 15 lbs ft2. Live load 20 lbs ft2 956 n m2 maximum span ft in nominal size. Contact your localalpine trussmanufacturerorofficeformoreinformation.

The size of a timber truss is an important part of designing a building and while there are no set maximum sizes there are some best practices. What do i need to know to calculate the max unsupported span of a truss. Ideally it is better to subdivide this into. The trusses should be a little longer than the exact width to allow for overhang and you will need sufficient trusses to mount across the length.

1 psf lbf ft2 47 88 n m2. To determine how many trusses to create you will first need to measure both the width and the length of the structure you are building. Span calculator for wood joists and rafters also available for the android os. To achieve maximum indicated spans trusses may require six or more panels.

The lower chords are resting on a wall in one half of the house and on the other half of the house they span the whole width with no support. Follow this guide to ensure the spacing and stability of your diy roof trusses. For example an 8 10 metre span for a timber truss is quite a long one and can lead to problems. Mono used where the roof is required to.

Bt b tc 6 6 common truss configurations for the most widely designed roof shapes. Keep in mind that these tables are for estimations only. Just bought a house and wife wants a wall knocked down.