Tempo:
Forms should not be removed until the concrete has acquired sufficient strength to support loads imposed during early construction. At least three days are required, but a week is preferable, particularly in cold weather. After the forms have been removed, seal all holes and recesses from the form ties with cement mortar prior to the application of dampproofing or waterproofing material.
Cast-in-place Foundation Walls Place concrete continuously without interruption. Tamp or vibrate the concrete to remove air pockets and to work the material around and beneath window frames and other blocking. Anchor bolts for sill plates should be placed while the concrete is in an unhardened condition. Such bolts are at least 12.7 mm (1⁄2 in.) in diameter, spaced no more than 2.4 m (8 ft.)
apart (Figure 40) and embedded at least 100 mm (4 in.) into the foundation wall. The ends should be deformed or bent to provide secure anchoring. The bolts themselves should be free of oil, and the concrete should be cured before the bolts are tightened. Wood-frame buildings with two or more floors situated in areas of high exposure to wind or earthquake require additional anchorage, specifically 12.7 mm (1⁄2 in.) bolts spaced not more than 1.7 m (5 ft. 6 in.) on centre or 15.9 mm (5⁄8 in.) bolts spaced not more than 2.4 m (8 ft.) on centre. In both cases, the first anchor bolt must be located within 0.5 m (1 ft. 8 in.) of the end of the foundation and there must be at least two anchors per braced wall panel. Engineering design is required for the anchorage in areas with extreme earthquake or wind loads.
40 Method of anchoring floor system to concrete walls, showing anchor bolt for wood sill
rim joist foundation joist 38 mm (11⁄2 in.) minimum joist bearing anchor bolt, nut and washer sill plate mortar bed or foam gasket
Cast-in-place Foundation Walls Place concrete continuously without interruption. Tamp or vibrate the concrete to remove air pockets and to work the material around and beneath window frames and other blocking. Anchor bolts for sill plates should be placed while the concrete is in an unhardened condition. Such bolts are at least 12.7 mm (1⁄2 in.) in diameter, spaced no more than 2.4 m (8 ft.)
apart (Figure 40) and embedded at least 100 mm (4 in.) into the foundation wall. The ends should be deformed or bent to provide secure anchoring. The bolts themselves should be free of oil, and the concrete should be cured before the bolts are tightened. Wood-frame buildings with two or more floors situated in areas of high exposure to wind or earthquake require additional anchorage, specifically 12.7 mm (1⁄2 in.) bolts spaced not more than 1.7 m (5 ft. 6 in.) on centre or 15.9 mm (5⁄8 in.) bolts spaced not more than 2.4 m (8 ft.) on centre. In both cases, the first anchor bolt must be located within 0.5 m (1 ft. 8 in.) of the end of the foundation and there must be at least two anchors per braced wall panel. Engineering design is required for the anchorage in areas with extreme earthquake or wind loads.
40 Method of anchoring floor system to concrete walls, showing anchor bolt for wood sill
rim joist foundation joist 38 mm (11⁄2 in.) minimum joist bearing anchor bolt, nut and washer sill plate mortar bed or foam gasket
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