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.
Flat roof steel truss span tables.
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.
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.
The load span tables shown below demonstrate only a tiny subset of the possible combinations available with trussteel cfs roof trusses.
Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch.
Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size.
These steel joints are needed to support the overall truss.
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.
Finally the truss calculator will compute the best dimensional method to connect the pieces of the truss with steel joints and a bridge.
Metal plate connected wood trusses hib 91 by permission of truss plate institute inc.
Roof pitch use recommended minimum roof pitches as specified by roof sheet supplier.
Roof truss span tables alpine engineered products 15 top chord 2x4 2x6 2x6 2x4 2x6 2x6 2x4 2x6 2x6 2x4 2x6 2x6.
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.
The same thing is true for the bridge of the truss.
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.
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.
Roof truss span chart.
Roof floor truss manual 7 31 08 10 43 am page 11.
The more complex the truss framework is the greater quantity of these joints will be required.
You can use sbca s span charts to roughly determine truss sizes available.
