Flat Roof Steel Truss Span Tables

These steel joints are needed to support the overall truss.

Flat roof steel truss span tables.

The above spans are based on american softwood lumber standard sizes. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. Finally the truss calculator will compute the best dimensional method to connect the pieces of the truss with steel joints and a bridge. Roof floor truss manual 7 31 08 10 43 am page 11.

The figures are based on quality materials. The same thing is true for the bridge of the truss. Keep in mind that these tables are for estimations only. In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot.

Roof truss span chart. Metal plate connected wood trusses hib 91 by permission of truss plate institute inc. Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size. Roof truss span tables alpine engineered products 15 top chord 2x4 2x6 2x6 2x4 2x6 2x6 2x4 2x6 2x6 2x4 2x6 2x6.

The more complex the truss framework is the greater quantity of these joints will be required. 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. Use these two tables for roof rafters with a slope greater than 3 in 12. Rafter span tables use these two tables for roof rafters with a slope of 3 in 12 or less.

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 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. 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. Attached flat roof 1ao page14.

The tables below give maximum spans for rafters and beams. They have not been updated for the change in lumber values within the last decade. Intermediate bearing simple span trusses header beam pocket floor truss supporting header beam. Typical roof truss design spans.