Emseal Backerseal - 5/8 per LF

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Emseal Backerseal - 5/8 per LF

Secondary sealant to liquid sealants for joints in walls.

A joint sealant for building walls and wall systems, Backerseal is economical, precompressed, secondary joint sealant to field-applied caulking. Backerseal is a polyurethane foam infused with a hydrophobic-acrylic impregnation technology.

Unlike ‘double caulk and backer rod’, Backerseal behind field-applied liquid sealants provides true “belt and suspenders” sealing–two systems working on different principles to perform the same function. ‘Double caulk and backer rod’ is very difficult to install to achieve the geometry necessary to function in moving joints. In addition, the same forces (tensile stresses at the bond line and within the cured sealant) that will cause the outer installation to fail, will also likely cause the inner installation to fail as well. Backerseal works in compression providing a practical-to-install, fully functional secondary joint sealant using different performance principles than the primary, liquid sealant. In addition Backerseal provides insulation and sound attenuation value as well as the ability to resist the effects of air-pressure differentials.


  • Provides watertight secondary seal
  • Provides R-value at joints
  • Resists air pressure differentials/ABAA compliant
  • Remains firmly in compression against substrates
  • Contributes to LEED
  • Odorless
  • Sound Attenuating
  • Clean handling
  • Non-staining
  • UV stable
  • Low temperature flexible
  • High-temperature stable


As a secondary sealant behind:

  • Conventional backer-rod and liquid sealants
  • Behind directly-applied liquid sealant

Ideally suited to:

  • panelized wall systems
  • curtain wall systems
  • window perimeters
  • precast panels
  • concrete
  • brick
  • stone
  • metal panels, etc.

(Note: Backerseal was formerly named GreyflexTM and may still appear in legacy specifications that way.)


Standard sizes | 1/4″ (6mm) to 1 1/4″ (30mm).

Custom sizes | 1/8″ (3mm) to 6″ (150mm).


+25%, -25% (50% total) of nominal material size.



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