|Length||10 to 20 m|
|Width||1 to 2 m|
The dimpled drainage board can help reduce intermittent hydrostatic pressure because it moves water away before pressure can build the foundation. A damp proof coating is advisable behind drainage boards to prevent incidental moisture infiltration as long as it doesn't interfere with performance or the manufacturer's specifications. Some drainage panels, as part of overall systems, use specially designed drainage boards in combination with waterproofing membrane.