Tempo:
Location and Excavation
MARKING THE EXCAVATION AREA Check with the municipality or township for minimum setback and side yard requirements before deciding the exact location of the house on the site. The proximity of the house to a property line can also affect such things as the size of window openings, soffits and exterior cladding so that the house does not pose a fire risk to a neighbouring house. Always check with local utility companies prior to digging to ensure that the excavation will not interfere with buried services. Inadvertently cutting telephone, gas or power lines can prove costly and result in injury. After the site is cleared, mark the perimeter of the house using the exact location of the corners of the lot as a reference. The latter are usually determined by a certified surveyor, marked by small wooden stakes accurately located at each corner, with nails driven into their tops indicating the outside line of the foundation walls.
Additional markings are needed because these stakes will eventually be lost during excavation. Offset markings may be located by extending the lines of the foundation walls from the established corners, and fixing these offset markings either with stakes or marks on surrounding permanent objects. These markings are used after excavation to erect batter boards (Figure 28). The area to be excavated is staked out, usually 600 to 700 mm (24 to 28 in.) wider than the corners of the house. This extra width is needed for easy handling and erection of the formwork, placement of the drain pipe, application of dampproofing and placement of the exterior insulation, if this is intended. Fluorescent paint may be applied to the ground to mark the perimeter of the excavation. Excavations more than 1.2 m (4 ft.) deep must have a back slope to ensure the safety of those working near the edge of the excavation.
MARKING THE EXCAVATION AREA Check with the municipality or township for minimum setback and side yard requirements before deciding the exact location of the house on the site. The proximity of the house to a property line can also affect such things as the size of window openings, soffits and exterior cladding so that the house does not pose a fire risk to a neighbouring house. Always check with local utility companies prior to digging to ensure that the excavation will not interfere with buried services. Inadvertently cutting telephone, gas or power lines can prove costly and result in injury. After the site is cleared, mark the perimeter of the house using the exact location of the corners of the lot as a reference. The latter are usually determined by a certified surveyor, marked by small wooden stakes accurately located at each corner, with nails driven into their tops indicating the outside line of the foundation walls.
Additional markings are needed because these stakes will eventually be lost during excavation. Offset markings may be located by extending the lines of the foundation walls from the established corners, and fixing these offset markings either with stakes or marks on surrounding permanent objects. These markings are used after excavation to erect batter boards (Figure 28). The area to be excavated is staked out, usually 600 to 700 mm (24 to 28 in.) wider than the corners of the house. This extra width is needed for easy handling and erection of the formwork, placement of the drain pipe, application of dampproofing and placement of the exterior insulation, if this is intended. Fluorescent paint may be applied to the ground to mark the perimeter of the excavation. Excavations more than 1.2 m (4 ft.) deep must have a back slope to ensure the safety of those working near the edge of the excavation.
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