Mar-flex manufactures the highest quality waterproofing membranes and other waterproofing products. Mar-flex offers some of the best, effective, and most reliable drainage boards. This Middletown, Ohio based company has poured millions over the years into developing the first 100% Green drainage boards. Mar-flex is also known for its ShockWave drainage board which is is not only 100% Green, but is virtually unbeatable, with its industrious design and the ability to gulp an unparalleled 101.11 gallons of water per hour per linear foot. Check out Mar-flex’s drainage board page for the best drainage boards in the entire industry, and from a family-owned American Made establishment.