Roof pitch use recommended minimum roof pitches as specified by roof sheet supplier.
Flat roof steel truss span tables.
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.
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.
The more complex the truss framework is the greater quantity of these joints will be required.
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.
Metal plate connected wood trusses hib 91 by permission of truss plate institute inc.
These steel joints are needed to support the overall truss.
Intermediate bearing simple span trusses header beam pocket floor truss supporting header beam.
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.
You can use sbca s span charts to roughly determine truss sizes available.
Flat roof span tables allow for a maximum roof pitch of 5ยบ.
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.
Finally the truss calculator will compute the best dimensional method to connect the pieces of the truss with steel joints and a bridge.
Roof truss span chart.
The load span tables shown below demonstrate only a tiny subset of the possible combinations available with trussteel cfs roof trusses.
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.
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.
