bearers and joist for deck.

[ausdesign]

90*45 f7 seasoned joists @ 450 centres span 1400 single
2/90*45 f7 seasoned bearers (single span) with a floor load width of 1200 can span 1700, with a flw of 1800 can span 1400 - you can interpolate between these for your 1300 joist span.
2/90*45 bearers (continuous span) can span 2100 with flw of 1200 & 1700 with a flw of 1800.

You may be having trouble with the tables as bearers are nominated within a height/width ratio. For a single deep member, tables for 'lintels over openings' may better suit.

These figures are all for decks less than 1 met. above ground level.

Hope this helps

[toddles]

This book might help (it's Austn) "Roof Cuts and Rafter" Lengths (10th ed) - $19.95AUD; Author: Hancock; Publ: McGILLS; ISBN: 0731647033<table width="100%"><tbody><tr><td colspan="2">
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