Flat Roof Steel Truss Span Tables

These steel joints are needed to support the overall truss.

Flat roof steel truss span tables.

Roof truss span chart. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. Keep in mind that these tables are for estimations only. 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.

Attached flat roof 1ao page14. The above spans are based on american softwood lumber standard sizes. The more complex the truss framework is the greater quantity of these joints will be required. They have not been updated for the change in lumber values within the last decade.

Roof floor truss manual 7 31 08 10 43 am page 11. Metal plate connected wood trusses hib 91 by permission of truss plate institute inc. 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. The tables below give maximum spans for rafters and beams.

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. Rafter span tables use these two tables for roof rafters with a slope of 3 in 12 or less. In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. 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.

Typical roof truss design spans. Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size. The load span tables shown below demonstrate only a tiny subset of the possible combinations available with trussteel cfs roof 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.

Use these two tables for roof rafters with a slope greater than 3 in 12. R cb150 16 beam span table used w 3600 width of frame rafter span χ 6410 fascia beam span the cb150 16 beam achieves the 6000mm span for the fascia beam and can be used for the rafters. Intermediate bearing simple span trusses header beam pocket floor truss supporting header beam. The figures are based on quality materials.