Roofing Australian Standards Timber Span Tables

From span table c the maximum allowable single span is 2160mm. Member tables for seasoned timber stress grade f17. The aged standards review is one of the ways in which standards australia gives effect to that commitment.

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2 denotes 600 mm rafter spacing only.

Roofing australian standards timber span tables.

1 refer to general notes for information that is relevant for all span tables. Required size for a given span. Spacing should be interpreted as the centre to centre distance between adjacent parallel members. A maximum roof pitch of 25 degrees is assumed.

3 for design parameters refer to figure 6 22 as1684 2 and 3. Joists crippled over supports shall be considered as single span joists. Roof load width rlw and floor load width flw can be determined from as1684 or from the images below. 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.

Table assumes a maximum flooring mass of 40kg. 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. Reading off the empty under table with h 5m hc 2 5m span table c will be used to determine the spans. Member span is not suitable for rafter spacing greater than 600mm.

Standards australia is committed to maintaining a contemporary and relevant catalogue of australian standards which add to the net benefit of the australian community. Construction details should be in accordance with as1684 2. Lintel span sheet roofing tiled roofing roof load width rlw mm 1500 2100 4500 7500 1500 2100 4500 7500 maximum span of lintel mm 90 x 35 600 2000 1800 1400 1200.