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Construction for Landscape Architecture by Jamie Liversedge, Robert Holden

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Moisture-proof courses

A moisture-proof course is a layer of impermeable material intended to stop the upward movement of groundwater owing to capillary action. It is placed at least 6 in above the ground level to protect against rainwater splash-back above the moisture-proof course or localized wet conditions, such as blocked drains. The moisture-proof course usually consists of a polymer membrane (such as polyethelene), an asphalt composite sheet, an asphalt/sheet-metal composite material or mastic aphalt. An alternative approach is to use impermeable engineering bricks in the walls up to 6 in above ground level, or use a slate layer (the latter is characteristic of older structures). Note, of course, that on sloping ground the moisture-proof ...

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