Following is undoubtedly an insulation layer, followed by drain board using an integral air gap. The drain board safeguards the waterproofing layer even though relieving hydrostatic force. Perimeter drains of four-inch Timetable 40 PVC included with coarse gravel or septic rock in filter cloth completes the installation. Damp proofing https://www.blackpooldampproofing.co.uk/services1/plastering
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