BACKERSEAL
Secondary sealant to directly applied, or typically applied, liquid sealants for joints in walls.

BACKERSEAL is supplied in reels or for larger joints, in 'sticks'. It is precompressed to less than the joint size.

To open, the wrapper is cut next to the colored marker tape. The release liner is removed to expose a mounting adhesive on one face.

BACKERSEAL is unrolled, inserted into the joint and adhered to one of the joint faces.

With time the material expands firmly in the joint and adheres itself to the other substrate.

Joins between butt ends of lengths of BACKERSEAL.  A watertight join is achieved as the pressure-sensitive adhesive impregnation marries to itself at the join.

Low-modulus liquid sealant (Dow 790 silicone shown) is gunned into the joint over the BACKERSEAL. (Note: in conventional backer rod and liquid sealant installation, BACKERSEAL would be recessed to allow for installation of the appropriately-sized backer rod).

The liquid sealant is tooled firmly against the BACKERSEAL to complete the installation.

For use in walls and wall systems, BACKERSEAL is an economical, high-performance, secondary sealant to field-applied caulking featuring EMSEAL's exclusive, microcell-modified, acrylic impregnation technology.

Standard sizes: 1/4" (6mm) to 1 1/4" (30mm). Custom sizes 1/8" (3mm) to 6" (150mm).

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

Watertight, odorless, clean handling, UV stable, non-staining, low temperature flexible, high-temperature stable.

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 and sound attenuation value as well as 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.

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

Used as a secondary sealant behind:

1) Conventional backer-rod and liquid sealants

2) Behind directly-applied liquid sealant