How to Use Drizoro Waterproofing Membranes for Sewers Waterproofing membranes for sewers perspective, the waterproofing of sewer tanks Drizoro recommends Drizoro Maxseal Flex which excellent crack bridging. Drizoro Maxseal Flex – A “Technically Superior multifunction product” that can be applied to “MOST” surfaces. Internal and external use. Below and above ground for negative and positive pressure. … Continue reading How to Use Drizoro Waterproofing Membranes for Sewers