DELTA®-FL Dimpled Membrane for Slab-On-Grade Floors

The Problems

To turn your basement into a usable, livable space, proper moisture protection is necessary. Moisture barriers are often installed only on the walls of a basement and not the footing. Moisture diffuses from the high area of concentration of the soil, to the low area of concentration in the basement.  

The Solution

DELTA®-FL is a dimpled, heavy-duty, gray plastic membrane for concrete and slab-on-grade floors that helps to keep moisture out of your basement. The membrane provides a significantly more comfortable floor.

DELTA®-FL protects sensitive materials by providing a reliable capillary break and vapor barrier. In a conventional basement, dry air in the living space acts as a “magnet” for water vapor migrating up through the concrete. The air gap created by DELTA®-FL allows the water vapor pressure above and below the concrete slab to equalize, while preventing the moisture from migrating further inwards. Hence, moisture does not affect the flooring material and your basement area stays dry and comfortable. The membrane also provides a thermal break, which increases the comfort in your basement and makes the floor feel warmer. 

Product Details
Product Benefits
  • Air-gap membrane
  • Composed of a special High-Density Polyethylene (HDPE) 
  • Provides a reliable capillary break and vapor barrier, ensuring a dry, livable basement
  • Creates a thermal break, making basement floor feel warmer
  • Impact-resistant HDPE makes the product extremely tough and rugged
  • Outstanding compressive strength of >4500 lb/sf
  • Minimal reduction in head room (8 mm)
  • Installed dimple side down, a ventilated air space is created above the slab, allowing equalization of water vapor pressure
  • Seams are simply taped with DELTA®-MOISTURE PROOF TAPE to ensure that moisture cannot migrate inwards through the joint areas
  • The lightweight product comes in two different roll sizes. It is fast and easy enough for the average homeowner to install
  • DELTA®-FL topped with plywood sheets will allow a variety of floor coverings to be installed: carpeting with underlay, vinyl flooring, hardwood flooring
  • Laminate floors can be directly laid on top of the membrane 

Guide Specifications

Installation Guides

Product Details

Safety Data Sheets

Technical Data

Related Accessories



    DELTA®-MOISTURE PROOF TAPE gives you a tight seal between seams, ensuring no mold or moisture damage. Use with DELTA®-FL.