An economical, high-performance, secondary sealant to field-applied caulking.

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 not only very difficult to install to achieve the geometry necessary to function in moving joints, but the same forces (primarily tensile stresses at the bondline and within the cured sealant) that will cause the outer installation to fail, will also likely cause the inner installation to fail as well.

By contrast, BACKERSEAL, because it works in compression, provides a practical to install, fully functional secondary seal using different performance principles than the primary, liquid sealant.  In addition it provides insulation value and the ability to resist the effects of air-pressure differentials.

Ideally suited to panelized wall systems, as well as concrete, brick, stone, metal panels, curtain wall systems, etc.

Consists of cellular acrylic-impregnated open cell foam, and where sizes permit, combined with laminations of closed-cell EVA foam.

Non-staining and compatible with wide range of caulking and substrate materials.

Used as a secondary sealant behind:
1) Conventional backer-rod and liquid sealants

2) Behind directly-applied liquid sealant

Puncturing of caulked facing does not affect sealant system performance.

Supplied pre-compressed to smaller than joint size with a mounting adhesive on one face. Material is inserted into joint and adhered to one side. It then expands to seal the joint.

Sealing between the foam and substrate is achieved through a combination of the pressure-sensitive adhesive impregnation and the active backpressure of the expanding foam.

Standard sizes from 1/8" (3mm) to 6" (150mm).

+25%, -25% (50% total) movement - permanently elastic.

*Sound Attenuation is also a feature of BACKERSEAL. With a 2 1/2" standard depth product installed in one side of a STC 68 wall, BACKERSEAL had a STC 53 rating and in an OITC 52 wall it had a 49 OITC rating. When installed from both sides of a STC 68 wall it received the maximum of STC 68 equaling the sound suppression of the wall and in an OITC 52 wall it received a OITC 51 rating.

100% free of wax or asphalt compounds (Why does this matter?)