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.
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, curtain wall systems, as well as walls constructed of concrete, brick, stone, metal panels, etc.
Elimination of Stack (Chimney) Effect in Curtainwall Systems – As a baffle in vertical mullions of curtainwall systems, BACKERSEAL can mitigate moisture intrusion and the noisy movement of air within vertical mullions known as the “stack effect”.
Standard sizes: 3mm to 150mm. Custom sizes are available (call Allco to discuss).
Movement capability: +/-25% (50% total) of nominal material size.
Sound Attenuation: with a 63.5mm (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.
Backerseal - Tech Data
Backerseal - Install Data
Backerseal - Safety Data Sheet
The Emseal Checklist