Dimple Underlayment

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Product Overview


  • Non-Toxic & Safe to Handle
  • Qty – 1 Roll 6'9" x 50'
  • Flow Rate: 18 gal/min/ft

Vapor barrier drainage matting underlayment has water channels created by molding high density polyethylene (HDPE) into sheets featuring aligned dimples. The stud-shaped dimples create space between the vapor barrier and the ground, allowing water to flow quickly and harmlessly away while protecting the crawl space vapor barrier.

• 100% recycled HDPE content used for the base material, environmentally safe and non-toxic

• Linear aligned dimples for a clear open drainage path for bulk water transport

• Membrane can be installed in any climate – is not weather dependent

• Compression strength of sheet meets IRC requirements for lateral earth pressures to 16 ft – 7590psf

Vapor Barrier Underlayment Technical Data:

  • Color: Gray
  • Material: Recycled High Density Polyethylene
  • Dimple Height: .315 (8mm) ASTM D6364-06
  • Compressive Strength: 7590 psf ASTM D6364-06
  • Flow Rate: 18 gal/min/ft ASTM D4716-08
  • Temperature Range: -20°F to 175°F ASTM D5261-92
  • Chemical Properties: Excellent chemical resistance
  • Toxicity: Non-toxic, nonpolluting
  • Weight per unit area:  21.70 oz/yd2² 736 (g/m²) ASTM D5261-92
  • Roll length: 50'
  • Roll width: 6'9"-34lbs
  • Service life expectancy: >30 years (at pH between 4 and 9, and temperature below 77°F / 25°C)


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