Tempo:
PLACEMENT OF THE HOUSE After the excavation has been completed, the next step is to establish the lines and elevation for the footings and foundation walls. Figure 30 shows a convenient arrangement of batter boards for this purpose. Using the previously established location of the foundation walls, place three stakes of suitable length at each corner at least 1.2 m (4 ft.) beyond the lines of the excavation. Nail horizontal boards as shown in Figure 30 so that the tops of all the boards are level and at the same elevation. Wire or stout string is stretched across the tops of opposite boards at two corners and adjusted exactly to follow the line of the outside edge of the foundation wall. Cut saw kerfs 6 to 8 mm
(1⁄4 to 3⁄8 in.) deep or install nails where the lines touch the boards to mark the position of the lines so that they can be replaced if needed. Two methods are commonly used to determine whether the building corners are square. The first is to measure the diagonals. If the diagonals between building corners are equal, the building corners are square (Figure 28). Another method known as triangulation calls for measurements along one side of the corner a distance in multiples of 300 mm (12 in.) and along the adjacent side the same number in multiples of 400 mm (16 in.). The diagonal, or hypotenuse, will have an equal number of multiples of 500 mm (20 in.) when the corner is square (Figure 28).
30 Method of setting batter boards and establishing corners for excavation
batter board dryline plumb line which represents the foundation wall corner line back slope workspace for tradespeople wall-footing junction footing on undisturbed soil using formboards subsoil
(1⁄4 to 3⁄8 in.) deep or install nails where the lines touch the boards to mark the position of the lines so that they can be replaced if needed. Two methods are commonly used to determine whether the building corners are square. The first is to measure the diagonals. If the diagonals between building corners are equal, the building corners are square (Figure 28). Another method known as triangulation calls for measurements along one side of the corner a distance in multiples of 300 mm (12 in.) and along the adjacent side the same number in multiples of 400 mm (16 in.). The diagonal, or hypotenuse, will have an equal number of multiples of 500 mm (20 in.) when the corner is square (Figure 28).
30 Method of setting batter boards and establishing corners for excavation
batter board dryline plumb line which represents the foundation wall corner line back slope workspace for tradespeople wall-footing junction footing on undisturbed soil using formboards subsoil
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