Flat Roof Steel Truss Span Tables

Metal plate connected wood trusses hib 91 by permission of truss plate institute inc.

Flat roof steel truss span tables.

The more complex the truss framework is the greater quantity of these joints will be required. 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. The same thing is true for the bridge of the truss. 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.

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. These steel joints are needed to support the overall truss. Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size. Flat roof span tables allow for a maximum roof pitch of 5º.

Intermediate bearing simple span trusses header beam pocket floor truss supporting header beam. Roof pitch use recommended minimum roof pitches as specified by roof sheet supplier. Keep in mind that these tables are for estimations only. 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 in inches.

Roof rafter span use this table to determine the maximum lengths of roof rafters based on species and grade of lumber spacing dimensions load and slope. The load span tables shown below demonstrate only a tiny subset of the possible combinations available with trussteel cfs roof trusses. Roof truss span chart. You can use sbca s span charts to roughly determine truss sizes available.

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. 05425 cold formed steel trusses roof truss spans every trussteel roof truss is a custom design based upon the unique load span bearing use and code criteria of a particular project. Flat roof with no permanent access and altitude not exceeding 100m 0 75 kn m udl 0 9 kn point load most areas exceeding 100m but not exceeding 200m excluding parts of scotland pennines north east england refer to bs 6399 3 1 kn m udl 0 9 kn point load. Roof floor truss manual 7 31 08 10 43 am page 11.