BACKERSEAL Installation Sequence Summary
(Direct-applied low-modulus silicone, binary-sealant installation shown).
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
wall joint and adhered to one of the joint faces.
With time the material expands firmly in the
wall 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.
R-value at joints;
- provides watertight
air pressure differentials;
- remains firmly in
compression against substrates;
acoustic dampening and;
- contributes to
1/4" (6mm) to 1 1/4" (30mm). Custom sizes 1/8" (3mm) to
capability: +25%, -25% (50% total) of nominal material size.
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
value as well as the ability to
resist the effects of air-pressure
Ideally suited to
panelized wall systems, curtain wall systems, as well as walls
constructed of concrete, brick, stone, metal panels, etc.
Non-staining and compatible with wide range
of liquid sealant and substrate materials.
Used as a secondary
1) Conventional backer-rod and liquid sealants
directly-applied liquid sealant
Puncturing of liquid
sealant facing does not affect sealant
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.
*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.
STC 53 / OITC 49*
|Empire State Building Uses BACKERSEAL
around windows as part of
$550 million energy efficiency retrofit:
Joint sealants around the 6,500 refurbished
windows are installed from swing stages on the Empire State Building.