Underseal® CRM™ Chemical Resistant Membrane

Underseal® CRM™ is a strong, 85-mil, robust pre-applied membrane that has been designed and tested to withstand elevated concentrations of soil, water and vapor contaminants. When installed below the slab and behind vertical walls, Underseal® CRM™ creates a barrier preventing water & vapor from transmitting into the structure.

Underseal® CRM™ provides a continuous seal underneath the concrete slab and behind vertical “blindside” cast in place concrete walls. A strong mechanical bond is developed between the membrane and concrete at the time of pouring as the concrete intermingles with the fibers of the nonwoven geotextile fabric. Underseal® CRM™ is typically installed horizontally over a prepared subbase such as compacted soil, mud slab or #57 stone. It can also be used in vertical applications.

FEATURES & BENEFITS

  • Superior Protection: 3-layers of waterproofing protection.
  • Superior Adhesive Bond: Creates a strong adhesive bond when the static load of the concrete slab causes sealant/adhesive compound.
  • Superior Adaptability: Flexible material that adapts to jobsite irregularities for ease of installation
  • Superior Joints: Fully-adhering, watertight, chemical and vapor resistant laps.
  • Provides a barrier that has been designed and tested to withstand elevated concentrations of contaminants
    typically found in construction sites which may be considered brownfield projects.

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Product Resources

FileAction
Data Sheet (PDF)Download 
Materials List (PDF)Download 
Features & Benefits (PDF)Download 
SDS (PDF)Download 

Contact your Polyguard representative for more information.

Product Submittals

For a job-specific submittal package, please contact Polyguard for Product Submittal Requests. Click here to find your area’s field representative.

Companion Products

(where applicable)
CR™ Seam Tape CR™ Seam Tape Used around pipe penetrations, end laps, and for patching damaged areas.
CR™ Liquid Membrane Used for several different types of detailing applications in conjunction with our Chemical Resistant Waterproofing System.
CR™ Sealant Used to prime all structural concrete, masonry,  insulation, or wood surfaces prior to our Chemical Resistant Waterproofing System.
CR™ Inside Corner Boot To be applied in the inside corner to reinforce and seal the corners of the Underseal® CRM™.
CR™ Outside Corner Boot To be used in the outside corner to reinforce and seal the  corners of the Underseal® CRM™.
CR™ Pit Top Corner Boot Preformed corner boot used to reinforce and seal the Underseal® CRM™.
Underseal® Fabric Tape Use around pipe penetrations and at end laps for patching damaged areas of the membrane.