Tempo:
Wood columns at least 140 × 140 mm (6 × 6 in. nominal) may be solid or built-up from 38 mm (2 in. nominal) lumber. Use at least 76 mm (3 in.) nails spaced at 300 mm (12 in.) on centre to fasten the built-up members together. A wood column should be the same width as the beam it supports and be cut square to ensure even bearing at the top and bottom. Fasten the column to the beam at the top and install dampproofing material such as 0.15 mm (6 mil) polyethylene or Type S roll roofing to separate it from the concrete at the bottom. Columns are usually spaced 2.4 to 3.0 m (8 to 10 ft.) apart, depending on the loading and strength of the beam they support. The footings
for basement columns must be sized to suit the column spacing, the span of the supported joists, the number of floors supported and the soil-bearing pressure. Either wood or steel beams may be used in house construction. For steel beams, the wide-flange (W) profile is most commonly used (Table 18 on p. 282). Wood beams can be solid or built-up. Built-up wood beams (Figure 53) are usually made of three or more pieces of 38 mm (2 in. nominal) lumber set on edge and fastened together from each side with 89 mm (31⁄2 in.) nails. Space the nails not more than 450 mm (18 in.) apart in each row, with the end nails located
52 Built-up wood beam foundation wall built-up wood beam joints should be within 150 mm (6 in.) of quarter point of clear span
sill plate 12 mm (1⁄2 in.) clearance if beam is untreated and the beam bottom is at or below grade all around or beam end preservative-treated at or below grade separate wood beams installed less than 150 mm (6 in.) above grade from concrete with dampproofing material, such as 0.155 mm (2 mil) polyethylene 89 mm (31⁄2 in.) minimum bearing
clear span steel or wood column
for basement columns must be sized to suit the column spacing, the span of the supported joists, the number of floors supported and the soil-bearing pressure. Either wood or steel beams may be used in house construction. For steel beams, the wide-flange (W) profile is most commonly used (Table 18 on p. 282). Wood beams can be solid or built-up. Built-up wood beams (Figure 53) are usually made of three or more pieces of 38 mm (2 in. nominal) lumber set on edge and fastened together from each side with 89 mm (31⁄2 in.) nails. Space the nails not more than 450 mm (18 in.) apart in each row, with the end nails located
52 Built-up wood beam foundation wall built-up wood beam joints should be within 150 mm (6 in.) of quarter point of clear span
sill plate 12 mm (1⁄2 in.) clearance if beam is untreated and the beam bottom is at or below grade all around or beam end preservative-treated at or below grade separate wood beams installed less than 150 mm (6 in.) above grade from concrete with dampproofing material, such as 0.155 mm (2 mil) polyethylene 89 mm (31⁄2 in.) minimum bearing
clear span steel or wood column
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