Mar-flex Waterproofing and Building Products recently began testing their products against the competitor’s specs using the American Society for Testing and Material’s ASTM D-5385. This test consists of three precast concrete patio blocks set up with waterproofing membranes to test head pressure. The official results are in, and Tremco’s Tuff-N-Dri H8 doesn’t stand up to the protection QuickSeal WB offers. The test shows Tuff-N-Dri H8 at 8′ of water (head pressure) at 40 mil dry. The QuickSeal WB tests came up superior, with 11.6′ of water (head pressure) at 40 mil dry. Mar-flex is awaiting the test results on the popular Mar-flex 5000 solution, and will be posting these results as they come in.