Reading off the empty under table with h 5m hc 2 5m span table c will be used to determine the spans.
Roof truss span table australia.
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.
This is set by the roof use you selected in the previous screen and cannot be modified.
Technical diagram span tables f7 rafters 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 1250 1150 1050 1000 950 90 x 30 1650 1550 1550 1400 1300 138 x 30 2600 2300 2150 2000 1800 185 x 30 3000 2650 2450 2350 2150 230 x 30 3050.
The same thing is true for the bridge of the truss.
Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size.
A maximum roof pitch of 25 degrees is assumed.
For simple construction such as domestic construction this can be determined from span table supplements in as1684 2 and as1684 3.
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.
Finally the truss calculator will compute the best dimensional method to connect the pieces of the truss with steel joints and a bridge.
From span table c the maximum allowable single span is 2160mm.
Loads are calculated in accordance with table 3 1 of as nzs 1170 1 2002.
Flat roof span tables allow for a maximum roof pitch of 5ยบ.
These steel joints are needed to support the overall truss.
The imposed uniformly distributed live load in the main span.
Span tables allow users to choose an appropriate size and stress grade to achieve spanning needs.
Other more complex load condition spans can be determined with our free hyne timber design 7 5 software.
The more complex the truss framework is the greater quantity of these joints will be required.
Spacing should be interpreted as the centre to centre distance between adjacent parallel members.
Roof pitch use recommended minimum roof pitches as specified by roof sheet supplier.
Roof load width rlw and floor load width flw can be determined from as1684 or from the images below.
Required size for a given span.
