Can HDPE Dimple Drainage Boards Protect Waterproofing Membranes?

HDPE Dimple Drainage Boards can help protect waterproofing membranes by creating a separating layer between the membrane and the surrounding soil. This separation may reduce direct contact with soil particles and help limit minor mechanical damage during backfilling. The dimples also create a drainage space that can help water move toward designated outlets. However, the board should not automatically be treated as a replacement for the waterproofing membrane. Waterproofing and drainage perform related but different functions. The membrane helps resist water penetration, while the drainage board supports water movement and protection. Both components should be selected and installed as part of a coordinated system.
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