GeoMat wall waterproofing & drainage membrane

GeoMat Drainage Board

  • GeoMat Drain Roll Diagrapm
  • GeoMat Drain Roll

When water reaches the edge of building, drainage prevents structural damage by redirecting the water and reducing hydrostatic pressure. Even buildings that have spray-on membranes are at risk from the pressure of below-grade water and the degrading impact of rocks and silt.

Geo-Mat+ Drainage Roll

• Custom designed accessories for a seamless installation
• 100% recycled HDPE content used for the base material, LEED credit available, environmentally safe and non-toxic
• Linear aligned dimples for a clear open drainage path for bulk water transport
• High drainage capacity diffuses hydrostatic pressure against foundation wall
• Roll sizes that make handling them manageable in the field for easy installation
• Unique attachment clips and strips for attaching the membrane to the foundation securely
• Sealing strips for overlaps to ensure bulk water stays outside of the membrane
• Membrane can be installed in any climate – is not weather dependent
• Performance is guaranteed – since the HDPE material is highly chemically resistant and will provide protection in any climate and resists water and water vapor penetration
• Compressive strength of sheet meets IRC requirements for lateral earth pressures to 16 ft – 5515psf
• Material can be used for construction in both the IRC and IBC

Like a drainage board, GeoMat Drainage Board removes water and resists hydrostatic pressure by channeling below-grade water towards footer drainage systems. These water channels are created by molding high density polyethylene (HDPE) into sheets featuring vertically and horizontally aligned dimples. The stud-shaped dimples create space between the sheet and the wall, allowing water to flow quickly and harmlessly away. In addition to channeling away below-grade water, GeoMat Drainage Board acts as a barrier to protect liquid membranes against back fill soil and sediment.

GeoMat’s strength and effective water-channeling design make it useful in a variety of applications. GeoMat Drainage Board can compliment and protect a spray-on waterproofing or dampproofing membrane. In instances where a drainage system is installed to reduce hydrostatic pressure, GeoMat may be used as a foundation dampproofing product as well as a waterproofing membrane. GeoMat accessories are available to facilitate any job and make installation easy.

Mar-flex created GeoMat Drainage Board as a next generation green product designed to meet the rising demand for commercial and residential building materials with a low environmental impact. GeoMat is made of 100% recycled material, and can be used towards LEED building credits.


  • Product Details

    Product Details

    Material: Geo-Mat -6’9″ Geo-Mat -8′ Geo-Mat -4′
    Color: Gray Gray Gray
    Roll Length: 50′ 50′ 50′
    Roll Height: 6’9″ 8′ 4′
    Dimple Height: .315″ .315″ .315″
    Elongation: 25% 25% 25%
    Compression Resistance: 5515psf 5515psf 5515psf
    Drainage Capacity: 18 gal/min/ft 18 gal/min/ft 18 gal/min/ft
    Rolls/Pallet: 12 Rolls 12 Rolls 12 Rolls


    GM-48204: Roll Size: 4’x50′           200 sq.ft/roll       Each or 12/Pallet

    GM-48255: Roll Size: 6′ 9″ x 50′     337.5 sq.ft./roll   Each or 12/Pallet

    GM-48260: Roll Size: 8′ X 50′         400 sq.ft./roll      Each or 12/Pallet


    Accessories: (1-1/4″ Fasteners-500/box – Part# AI-28134 and Geo Clips – Part#GM-48277) fastens board to poured wall, providing an additional bond until back-filled. May be installed into concrete with hammer.



    Mar-flex 5000 Waterproofing Membrane


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