Flat Roof Steel Truss Span Tables

The figures are based on quality materials.

Flat roof steel truss span tables.

Roof truss span chart. 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. Typical roof truss design spans.

They have not been updated for the change in lumber values within the last decade. These steel joints are needed to support the overall truss. 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. Finally the truss calculator will compute the best dimensional method to connect the pieces of the truss with steel joints and a bridge.

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. Use these two tables for roof rafters with a slope greater than 3 in 12. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.

Roof floor truss manual 7 31 08 10 43 am page 11. 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 tables below give maximum spans for rafters and beams.

Rafter span tables use these two tables for roof rafters with a slope of 3 in 12 or less. 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. 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. The load span tables shown below demonstrate only a tiny subset of the possible combinations available with trussteel cfs roof trusses.

The more complex the truss framework is the greater quantity of these joints will be required. The same thing is true for the bridge of the truss. The above spans are based on american softwood lumber standard sizes. Metal plate connected wood trusses hib 91 by permission of truss plate institute inc.