Roof Truss Span Table Australia

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 table australia.

The same thing is true for the bridge of the truss. The more complex the truss framework is the greater quantity of these joints will be required. A maximum roof pitch of 25 degrees is assumed. Spacing should be interpreted as the centre to centre distance between adjacent parallel members.

Step 4 assume the wind classification for the area is n1 and the roofing profile is stramit corrugated cladding 0 48mm bmt thickness in a single span configuration. Flat roof span tables allow for a maximum roof pitch of 5º. The imposed uniformly distributed live load in the main span. 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.

Loads are calculated in accordance with table 3 1 of as nzs 1170 1 2002. Other more complex load condition spans can be determined with our free hyne timber design 7 5 software. Reading off the empty under table with h 5m hc 2 5m span table c will be used to determine the spans. Roof pitch use recommended minimum roof pitches as specified by roof sheet supplier.

For simple construction such as domestic construction this can be determined from span table supplements in as1684 2 and as1684 3. Finally the truss calculator will compute the best dimensional method to connect the pieces of the truss with steel joints and a bridge. 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. 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.

These steel joints are needed to support the overall truss. Roof load width rlw and floor load width flw can be determined from as1684 or from the images below. Span tables allow users to choose an appropriate size and stress grade to achieve spanning needs. This is set by the roof use you selected in the previous screen and cannot be modified.

Required size for a given span.