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Description: Traditional five-ply, 12.5-mm Douglas fir plywood has recently disappeared from the Canadian retail lumber market. Now the product is four-ply, 12.2-mm, which has shown consistently poorer performance when tested as connecting gussets for nailed wood roof trusses. This experiment examined some of the implications of the changes in CSA-0121 Douglas fir plywood, and seeks a better alternative gusset/nail combination. The best connection tested was a two member, three-gusset system using 0.91-mm (20-gage) steel side gussets and a 1.22-mm (18-gage) center gusset giving a unit lateral resistance of 3.15 kN/nail, compared with five-ply Douglas fir plywood at 0.99 kN/nail. Five-ply Douglas fir plywood in turn gave significantly higher ultimate unit lateral resistance (Nu) than four-ply Douglas fir and the spruce plywoods tested. However, at 1.27 mm slip, the unit lateral slip resistance values (Ns) for the Douglas fir plywoods did not show a significant strength advantage over the values for corresponding layups of spruce plywood.

Keywords: nail loads for truss connections using steel vs. five-ply and four-ply fir and spruce plywood gussets
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Citation: Turnbull, J. E. and L. P. Lefkovitch 1986. NAIL LOADS FOR TRUSS CONNECTIONS USING STEEL VS. FIVE-PLY AND FOUR-PLY FIR AND SPRUCE PLYWOOD GUSSETS. Canadian Agricultural Engineering 28(2):167-174.
Volume: 28
Issue: 2
Pages 167 - 174
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Date: 1986
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Coverage: Canada
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