Tempo:
graded so that water will not accumulate on the surface. The suggested maximum gradient along the length is 5 per cent with a cross slope of 2 per cent. Common surfacing materials for driveways are concrete, asphalt and interlocking pavers. Proprietary systems are available that will support vehicle loads but allow water to dissipate and allow grass or ground cover to grow. Gravel surfacing is often used for rural driveways. An area to be paved must be graded to a uniform smooth surface and be well compacted. Provide gravel or crushed stone at least 100 mm (4 in.) thick after compaction. Asphalt should be at least 40 mm (11⁄2 in.) thick and concrete at least 100 mm (4 in.) deep. Concrete placing, finishing and curing should be carried out as described in Chapter 7.
Place control joints in concrete driveways 3 to 3.5 m (10 to 12 ft.) apart. Use 6 to 12 mm (1⁄4 to 1⁄2 in.) thick pre-moulded joint filler to isolate the concrete surface from curbs, the garage floor and the house foundation wall.
WALKWAYS Cast-in-place concrete, interlocking pavers and flagstones are commonly used for walkways. They should be built on a well-compacted base with a slight slope to drain surface water. The recommended maximum gradient for a walkway along its length is 5 per cent with a maximum cross-slope of 2 per cent. Concrete walks should be at least 100 mm (4 in.) thick. Locate control joints spaced about 1.5 times the walkway width. Interlocking pavers and flagstones should be placed over a compacted levelling bed of sand or stone dust.
SUSTAINABLE HOUSING INSIGHT Healthy Indoor Environment
Good drainage away from the foundation helps prevent indoor quality-related moisture problems.
Environmental Responsibility
Use porous paving materials wherever possible to allow storm water to be absorbed in the ground.
RELATED PUBLICATIONS Landscape Guide for Canadian Homes, Canada Mortgage and Housing Corporation (publication no. 63523)
Place control joints in concrete driveways 3 to 3.5 m (10 to 12 ft.) apart. Use 6 to 12 mm (1⁄4 to 1⁄2 in.) thick pre-moulded joint filler to isolate the concrete surface from curbs, the garage floor and the house foundation wall.
WALKWAYS Cast-in-place concrete, interlocking pavers and flagstones are commonly used for walkways. They should be built on a well-compacted base with a slight slope to drain surface water. The recommended maximum gradient for a walkway along its length is 5 per cent with a maximum cross-slope of 2 per cent. Concrete walks should be at least 100 mm (4 in.) thick. Locate control joints spaced about 1.5 times the walkway width. Interlocking pavers and flagstones should be placed over a compacted levelling bed of sand or stone dust.
SUSTAINABLE HOUSING INSIGHT Healthy Indoor Environment
Good drainage away from the foundation helps prevent indoor quality-related moisture problems.
Environmental Responsibility
Use porous paving materials wherever possible to allow storm water to be absorbed in the ground.
RELATED PUBLICATIONS Landscape Guide for Canadian Homes, Canada Mortgage and Housing Corporation (publication no. 63523)
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