Shockwave drainage board channels water away from foundations and is the first board designed for below-grade applications that features crush-resistant memory, which protects the waterproofing membranes during backfill. Made of recycled, closed-cell foam, the board is environmentally friendly and comes in 3x4-foot sheets for less waste during installation. Its R-value is not affected by underground moisture. Mar-flex Waterproofing and Basement Products. 800-498-1411.