Roof load width rlw and floor load width flw can be determined from as1684 or from the images below.
Roof truss span tables metric.
Technical diagram on page 35 30mm m aximum allow able sp ans mm sheet roof spacing mm rafter size 600 760 900 1000 1200 66 x 30 850 750 700 700 600 90 x 30 1200 1050 1000 900 850 138 x 30 1700 1550 1400 1300 1200 185 x 30 2000 1750 1600 1550 1400 230 x 30 2000.
Roof truss span tables alpine engineered products 15 top chord 2x4 2x6 2x6 2x4 2x6 2x6 2x4 2x6 2x6 2x4 2x6 2x6 bottom chord 2x4 2x4 2x6 2x4 2x4 2x6 2x4 2x4 2x6 2x4 2x4 2x6 2 12 24 24 33 27 27 37 31 31 43 33 33 46 2 5 12 29 29 39 33 33 45 37 38 52 39 40 55 3 12 34 34 46 37 39 53 40 44 60 43 46 64 3 5 12 39 39 53 41 44 61 44 50 65 47 52 70.
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.
You can use sbca s span charts to roughly determine truss sizes available.
Keep in mind that these tables are for estimations only.
Roof floor truss manual 7 31 08 10 43 am page 12.
Spacing should be interpreted as the centre to centre distance between adjacent parallel members.
Required size for a given span.
And parallel to floor truss span strongback lateral supports 24 max.
The more complex the truss framework is the greater quantity of these joints will be required.
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 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.
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.
These steel joints are needed to support the overall truss.
The same thing is true for the bridge of the truss.
Span tables f7 rafters a maximum roof pitch of 25 degrees is assumed.
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.
