A Damp Proof Membrane (DPM) is a barrier material used in construction to prevent moisture or water from rising through floors or walls. It is an essential part of waterproofing, especially for ground-level and underground structures like foundations, slabs, and basements.
Key Features of DPM:
Material: Usually made from polyethylene (plastic)
Thickness: Typically ranges from 250 to 1200 microns (commonly 1000 gauge ≈ 250 microns).
Color: Often black, blue, or clear.
Application: Laid under concrete slabs or between building layers.
Uses:
1. Prevent Rising Damp: Stops moisture from traveling up from the ground into floors and walls.
2. Basement Tanking: Acts as part of a waterproofing system in underground rooms.
3. Protect Insulation: Keeps insulation materials dry and effective.
4. Flooring: Used under screeds .