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Pre-Applied Sheet Waterproofing

The membranes on this page are typically applied prior to the concrete pour. These products may be used in a horizontal (Underslab) application or in a vertical (Blindside) application. In either case our Underseal Family of products are well known in the industry for superior performance, superior resistance to water migration and superior durability.


Underslab Product Photo

Underseal® Underslab Membrane

Underseal® Underslab Membrane is a tough, 85 mil pre-concrete pour waterproofing membrane/vapor barrier designed to virtually eliminate water ... read more

  • Superior Protection: 3 layers of waterproofing protection
  • Superior Puncture Resistance: Higher than current Class A Vapor Barrier requirements (2200 grams, or under 5 pounds)
  • Superior Resistance to Water Migration: Eliminates water and vapor migration by forming a strong mechanical bond to the concrete
  • Superior Adhesive Bond: Creates a strong adhesive bond when the static load and thermal reactive heat of the concrete slab causes sealant/adhesive compound to have an intimate contact with the concrete surface
  • Superior Adaptability: Flexible material that adapts to jobsite irregularities for ease of installation

U.S. Patent No. 7,488,523
U.S. Patent No. 7,686,903

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Above Grade
Blindside™ Product Photo

Underseal® Blindside™ Membrane

Underseal® Blindside™ Membrane is a 73 mil, pre-concrete pour, strong sheet membrane waterproofing with a thick, cross-laminated, ... read more

  • Superior puncture resistance of greater than 217 lbs, which provides strong resistance to concrete construction abuse
  • Rainfall, freeze/thaw and wet/dry cycling do not affect the installed system
  • Flexible material that adapts to jobsite irregularities
  • Fully adhering watertight laps for ease of installation
  • Available in a Winter Formulation October through March
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Above Grade