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Table 43 (continued) Built-up beams for exterior decks (lumber incised)1 Number and Size of Plys mm (in.)
D.Fir-L
Hem-Fir
S-P-F
Northern Species
Post Spacing m
2.4
2.7
3.0
3.3
3.7
4.3
ft.
8
9
10
11
12
14
1.2
1-38 x 140
1-38 x 140
1-38 x 140
1-38 x 140
1-38 x 184
1-38 x 184
4
1-2 x 6
1-2 x 6
1-2 x 6
1-2 x 6
1-2 x 8
1-2 x 8
1.8
1-38 x 235
1-38 x 235
1-38 x 235
1-38 x 235
2-38 x 184
2-38 x 184
6
1-2 x 10
1-2 x 10
1-2 x 10
1-2 x 10
2-2 x 8
2-2 x 8
2.4
2-38 x 184
2-38 x 184
2-38 x 235
2-38 x 235
2-38 x 235
2-38 x 235
8
2-2 x 8
2-2 x 8
2-2 x 10
2-2 x 10
2-2 x 10
2-2 x 10
1.2
1-38 x 140
1-38 x 140
1-38 x 140
1-38 x 140
1-38 x 140
1-38 x 184
4
1-2 x 6
1-2 x 6
1-2 x 6
1-2 x 6
1-2 x 6
1-2 x 8
1.8
1-38 x 184
1-38 x 235
1-38 x 235
1-38 x 235
1-38 x 235
2-38 x 184
6
1-2 x 8
1-2 x 10
1-2 x 10
1-2 x 10
1-2 x 10
2-2 x 8
2.4
2-38 x 184
2-38 x 184
2-38 x 184
2-38 x 235
2-38 x 235
2-38 x 235
8
2-2 x 8
2-2 x 8
2-2 x 8
2-2 x 10
2-2 x 10
2-2 x 10
1.2
1-38 x 140
1-38 x 140
1-38 x 140
1-38 x 140
1-38 x 140
1-38 x 184
4
1-2 x 6
1-2 x 6
1-2 x 6
1-2 x 6
1-2 x 6
1-2 x 8
1.8
1-38 x 184
1-38 x 184
1-38 x 235
1-38 x 235
1-38 x 235
2-38 x 184
6
1-2 x 8
1-2 x 8
1-2 x 10
1-2 x 10
1-2 x 10
2-2 x 8
2.4
2-38 x 184
2-38 x 184
2-38 x 184
2-38 x 184
2-38 x 235
2-38 x 235
8
2-2 x 8
2-2 x 8
2-2 x 8
2-2 x 8
2-2 x 10
2-2 x 10
1.2
1-38 x 140
1-38 x 140
1-38 x 184
1-38 x 184
1-38 x 184
1-38 x 235
4
1-2 x 6
1-2 x 6
1-2 x 8
1-2 x 8
1-2 x 8
1-2 x 10
1.8
1-38 x 235
2-38 x 184
2-38 x 184
2-38 x 184
2-38 x 184
2-38 x 235
6
1-2 x 10
2-2 x 8
2-2 x 8
2-2 x 8
2-2 x 8
2-2 x 10
2.4
2-38 x 235
2-38 x 235
2-38 x 235
2-38 x 235
2-38 x 286
2-38 x 286
8
2-2 x 10
2-2 x 10
2-2 x 10
2-2 x 10
2-2 x 12
2-2 x 12
Joist Span
Notes to Table 43 1. Incising is knife cutting the surface of wood to help perservatives penetrate the wood. 2. Design based on 2001 CAN/CSA O86. 3. Live load = 40 psf (1.9 kPa), Dead load = 10 psf (0.5 kPa). 4. Lumber No. 2 and Better grade, pressure treated, wet service. 5. Beam selection is for a beam on the edge of a deck. Double the number of plys for middle beams supporting joists on both sides. 6. Nail-laminate the beams to act as a single member (see Columns and Beams).