WHY USE EMSEAL LOG HOME SEALANTS Permanent elasticity/memory enables it to fill gaps
caused by changes in log size (shrinking and settling)
Continuous backpressure enables the foam sealant to
fill contours and irregularities
Maintains weathertight seal and thermally insulates
over extreme temperature ranges
Does not dry out, become brittle or crack
Unlike putty-type (butyl) and liquid sealants which
squeeze-out under compression, LogHomeTape
compresses into itself and remains in place between
the logs where it is needed.
Resistant to ultraviolet light and ozone
Does not cause “log-float” (suspension of logs by airfilled
cells of closed-cell gaskets)
Easy to install with mounting-adhesive on one side—
strong polyester scrim embedded in adhesive resists
stretching of material during installation
Highly resistant to vermin (bugs, rodents, birds, etc.)
No ozone-depleting chemicals used in manufacturing
and contains no volatile organic compounds
EMSEAL Log Home Tapes are high performance sealants
with the following characteristics:
THE EMSEAL ADVANTAGE: HOW IT WORKS
Open-cell foam is impregnated, compressed to the size of
the opening to be sealed, and shipped in reels. The stored
strain-energy of compression in the foam means continuous
back-pressure is exerted against the logs. This pressure,
combined with the adhesive nature of the impregnation,
assures reliable adhesion to both upper and lower log
surfaces. As the logs shrink and expand with seasonal
temperature and humidity changes, long-term sealing
contact with the log surfaces is maintained.
FACTORS IN COMPARING GASKETING MATERIALS:
Backpressure – The pressure exerted by the seal
against the log surfaces. This must be sufficient to
cause the seal to expand as a gap opens but not so
great that it causes “log float”.
Recovery – This indicates how completely the foam
recovers to its original dimension after extended
compression. The higher the recovery percentage, the
better the seal.
Durability – This includes the ability to resist ultraviolet
light and ozone exposure that can cause brittleness,
cracking and ultimately seal failure.
Wood-Preservative Compatibility – Some foam
sealants can be applied to treated wood, others only
to wood that has not been treated. The foam sealant
should work with preservatives, whether applied
before or after installation of the seal.
Ease of Installation – Some foams are self-sticking, with removable release for easy installation.
AVOID COMMON MISTAKES
Perhaps one of the most costly mistakes made
in log home sealing is to undersize the preformed sealant
used between horizontal log courses. The sealant should
match the joint-gap size after settlement and shrinkage have
been allowed for.
High performance sealant vs. low-cost short-life alternatives:
High performance sealants, properly sized and applied are
the better choice. Consider the cost of routing-out and
replacing old sealant against the up-front cost of a high
Check available sealant depth:
As the tape width is
increased, so does the ultimate margin of safety. However,
tape width is also determined by the tongue and groove or
other configuration present. Ensure that within these
parameters maximum use is made of tape width.
Correct sealant termination:
If your log home had no
openings (i.e. windows or doors let into the walls), then the
correct sealant configuration would be continuous seals
running completely around each log course. This means that
at each corner the sealant would be lapped to provide
suitable horizontal seal integrity. Since openings are present
in the structure for doors and windows, seal integrity must be
preserved both, horizontally and vertically. Care must be
taken to ensure that horizontal and vertical seals terminate
into one another.
Double vs. single sealant System:
It is generally accepted
that the use of a double gasket system is preferable to the
use of a single gasket system. A “dead-air” void is created
between the two seals which greatly enhances the thermal
insulation properties of the log home.
Good joint design provides for the seal
to be positioned at a high point in the joint detail so that as
much as possible, water tends to drain away from the seal