TREMDrain DPI

Drainage and Protection Board

TREMDrain® DPI is an optional drainage, protection and insulation board designed for use primarily with TREMproof® 260 Spray-Applied Waterproofing Membrane. TREMDrain DPI’s unique and proven glass fiber design promotes efficient water drainage and the retention of the board’s Rvalue. The semi-rigid nature of the board acts as a protection course for the TREMproof 260 waterproofing membrane.

TREMDrain DPI is an excellent way to address below-grade energy efficiency needs. It fulfills requirements specified in ASHRAE 90.1 which call for belowgrade walls to have “a rated R-value insulation not less than” what is specified for the climate zone.

Basic Uses
  • TREMDrain DPI is installed in vertical applications, where TREMproof 260 has been applied to typical applications such as foundation walls, tunnels, and planters.
  • TREMDrain DPI protects the waterproofing membrane, channels water to the drainage system and insulates foundation walls.
  • The exterior insulation of foundation walls can reduce interior condensation by increasing the outside temperature of the wall, helping move the dew point nearer to the outside of the wall. TREMDrain DPI may help reduce the risk of freeze/thaw related damage on typical foundation walls.
  • TREMDrain DPI allows for same day and efficient installation of the drainage, protection and insulation course when used with TREMproof 260.

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FAQ
  • What are the advantages of a Tremco drainage mat versus aggregate backfill?

    The use of a Tremco drainage mat provides the following advantages:                                                                                                                                                                                           1. The water flow rate is equal to or better than the aggregate backfill.
    2. Aggregate backfill needs to be trucked to the site and the dirt backfill hauled from the site. With drainage, both of these procedures are eliminated.
    3. Aggregate adds additional weight-bearing to the foundation wall. Drainage mat does not.
    4. Drainage mat allows for full head-to-footer flow of water.
    5. Drainage mat can be fitted with outlets and drainage accessories to further move the water away from the structure.

  • What adhesives may be used for installing drainage mat to Tremco below-grade waterproofing membranes?

    Contractors have successfully used daubs of the Tremco membrane originally used to waterproof the foundation.  Insulation hangers may be set into wet daubs of Tremco membrane.  3M Holdfast 70 M has been independently evaluated by 3M and Tremco below-grade waterproofing membranes are listed as compatible on their web site.  Backfilling should commence as soon as possible after installation of the drainage mat.

  • What is the difference between drainage mat and protection course?

    Drainage mat is principally designed to reduce hydrostatic head pressure and direct water to a perforated drainage system.  A protection course is a puncture-resistant material designed to minimize or prevent possible damage to the waterproofing membrane prior to or during concrete pour and backfilling.

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