Underseal® PRM™

Underseal® PRM™ is a strong, self-adhering, 65-mil, post-concrete pour sheet waterproofing membrane/vapor retarder with a double thick, high-strength, cross-laminated polyethylene backing laminated to a thick layer of rubberized asphalt compound.  Underseal® PRM™ adheres tightly and permanently to concrete and the backing forms a continuous barrier to water and moisture vapor entry. Underseal® PRM™ can be used in both horizontal and vertical applications.

VERTICAL APPLICATION:  Underseal® PRM™ can be used in protected wall applications when applied to the exterior sides of vertical concrete foundation walls, tunnels, and related applications where waterproofing is critical.  It allows for faster waterproofing applications by eliminating the step to install an additional protection course prior to backfilling operations.

HORIZONTAL APPLICATION:  Underseal® PRM™ can be applied to horizontal slab applications such as parking garages, plaza decks, plywood decks and related applications and allows for concrete topping slab installation without the need for a separate protection course in most situations.

FEATURES & BENEFITS

  • Strong, self-adhering sheet membrane with a double thick, high strength, cross-laminated polyethylene backing
  • Adheres tightly and permanently to concrete
  • Backing forms a continuous barrier to water and moisture vapor entry
  • Allows for faster waterproofing applications by eliminating the step to install an additional protection course prior to backfilling operations
  • HORIZONTAL – designed for application to horizontal slabs such as parking garages, plaza decks, plywood decks, and related applications where waterproofing is critical
  • VERTICAL – designed for application to the exterior sides of vertical concrete foundation walls, tunnels, and related applications where waterproofing is critical
  • The Underseal® PRM™ can be utilized in the Dual Core System that capitalizes on both the advantages of a fluid-applied and sheet-applied membrane in a single system
  • Formulated for low temperature applications down to 25°F (-4°C)

Companion Products

(where applicable)
650 LT Liquid Adhesive Used to prime all structural concrete, masonry, or wood surfaces prior to membrane installation.
650 WB Liquid Adhesive Used to prime all structural concrete, masonry, or wood surfaces on which Polyguard Membranes will be applied.
Balconyguard™ Outside Corner Boot 60-mil combination of rubberized asphalt and polyethylene for corner detailing.
Commercial Stretch Fluid-applied, single-component thermoplastic rubber coating.
Detail Sealant PW™ VOC/HAPS-free high performance solvent-free sealant.
Detail Tape Use as detail strips on corners, penetrations, joints, and for patching damaged areas of the membrane.
Green Concrete Liquid Adhesive. Used to prime green concrete less than seven day cure for normal structural concrete
LM-85 SSL Self leveling flood coat waterproofing membrane.
LM-95 Two-component fast cure urethane waterproofing membrane.
Polyflow® 10 / 10P Prefabricated geocomposite vertical use drainboard with a compressive strength of 10,000 psf.
Polyflow® 15 / 15P Sheet molded drain for vertical application with a compressive strength of 15,000 psf.
Polyflow® 18 Sheet molded drain for horizontal application with a compressive strength of 21,000 psf.
Quick Grip Adhesive Industrial-grade aerosolized adhesive in a portable spray system.
Totalflow™ A sheet molded high-capacity perimeter drain.

Product Resources

FileAction
Data Sheet (PDF)Download 
Dual Core System Data Sheet (PDF)Download 
Guide Spec (PDF)Download 
Guide Spec (WORD)Download 
Dual Core System Guide Specs w/ Commercial Stretch (PDF)Download 
Dual Core System Guide Specs w/ Commercial Stretch (WORD)Download 
Dual Core System Guide Specs w/ LM-85 SSL (PDF)Download 
Dual Core System Guide Specs w/ LM-85 SSL (WORD)Download 
Materials List (PDF)Download 
Features & Benefits (PDF)Download 
SDS (PDF)Download 

Standard Details (DWG)

Corners

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PGArch Detail PRM13 PRM Field Form Self Adhered Inside Corner 07012019Download 
PGArch Detail PRM14 PRM Field Form Self Adhered Outside Corner 07012019Download 

Joints

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PGArch Detail PRM6 PRM Horizontal Expansion Joint Cover 07012019Download 
PGArch Detail PRM11 PRM Wall Expansion Joint Cover 07012019Download 

Penetrations

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PGArch Detail PRM4 PRM Horizontal Penetration Waterproofing 07012019Download 
PGArch Detail PRM8 PRM Dual Level Drain 07012019Download 
PGArch Detail PRM15 PRM Vertical Wall Penetration Waterproofing 07012019Download 

Repairs / Patches

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PGArch Detail PRM1 PRM Self Adhered Repair Patch 07012019Download 

Terminations

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PGArch Detail PRM7 PRM Horizontal Slab At Wall Termination 07012019Download 
PGArch Detail PRM16 PRM TopOfWallTerminationOptions 07012019Download 

Transitions

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PGArch Detail PRM12 PRM Hot Applied Rubber Tie In To Self Adhered Wall Membrane 07012019Download 
PGArch Detail PRM10 PRM FooterWaterproofing TopOfInteriorFloorIsGreaterThan12inchesAboveTopOfFooter 07012019Download 
PGArch Detail PRM9 PRM FooterWaterproofing TopOfInteriorFloor12inchesAndUnderFromTopOfFooter 07012019Download 
PGArch Detail PRM5 PRM TunnelWaterproofingDetail 07012019Download 
PGArch Detail PRM3 PRM VerticalWallApplication 07012019Download 
PGArch Detail PRM2 PRM PouredConcreteOrCMUPlanterWaterproofing 07012019Download 

Walls

FileAction
PGArch Detail PRM2 PRM Poured Concrete Or CMU Planter Waterproofing 07012019Download 
PGArch Detail PRM3 PRM Vertical Wall Application 07012019Download 
PGArch Detail PRM5 PRM Tunnel Waterproofing Detail 07012019Download 
PGArch Detail PRM9 PRM Footer Waterproofing Top Of Interior Floor 12 inches And Under From Top Of Footer 07012019Download 
PGArch Detail PRM10 PRM Footer Waterproofing Top Of Interior Floor Is Greater Than 12 inches Above Top Of Footer 07012019Download 

Product Submittals

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