For simple construction such as domestic construction this can be determined from span table supplements in as1684 2 and as1684 3.

Timber framing hardwood span tables. Hot dipped galvanised bolts or coach screws at 600 mm maximum spacing. Span tables f7 rafters 30mm 11 f7 rafters 42mm 14 verandah beams f7 42mm sheet roof 17 verandah beams f7 42mm tile roof 20 verandah beams gl8 sheet roof 21 verandah beams gl8 tile roof 24 ridge beams f7 42mm sheet roof 25 ridge beams f7 42mm tile roof 28 internal floor joists f7 42mm 30. Table 1a bearers supporting single storey loadbearing walls maximum floor load width 1800mm. Sheet roofing tiled roofing roof load width rlw mm 1500 2100 4500 7500 1500 2100 4500 7500.

For the purpose of using these tables span may be interpreted as the clear distance between supports measured along the beam. Span tables allow users to choose an appropriate size and stress grade to achieve spanning needs. Member tables for seasoned timber stress grade f17. This standard does not preclude the use of framing fastening or bracing methods or materials other than those specified.

Single span beams are beams supported at two points only. Tables 1 2 5 and 10 list the recommended sizes and spans for the most commonly available timber species. Other more complex load condition spans can be determined with our free hyne timber design 7 5 software. Seasoned hardwood f17.

Span tables in supplements for unseasoned hardwood f8 and f11 may be used for unseasoned f8 and f11 softwood as well. Seasoned hardwood f17129. Tables with a suffix l are for low wind speed areas n1 n2 n3 and c1. For alternative species and larger spans refer as 1684.

A cd rom which contains the above supplements is attached to this standard. When appropriate separate tables are provided for different wind classifications. Ledgers shall be a minimum 90 x 45 mm treated pine hardwood or cypress fixed to house framing studs joists or bearers with 12 mm dia.

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