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The True North Patented Tongue & Groove System
True North's new Thermo-groove six seal system
is an example of the kind of research and technology that makes
True North the #1 choice among log homebuyers today.
Further Improving The True North Log Joinery System
 The
newly released Thermo-groove six-seal patent pending system is
a recent innovation for True North Log Homes and available on our
8" x 12", 10" x 12" and 12" x 12" logs.
The True North tongue and groove technology is designed with six
channels to accommodate the butyl rubber tape sealant and the asphalt
impregnated foam gasket tape. The outside channels are angled to
accommodate the butyl tape. During construction, this unique angle
prevents the butyl tape from falling off while setting the log
above and actually increases the seal from 1/4" to 3/8" as
we are utilizing the diagonal of the butyl tape instead of the
width from side to side. This increases performance without the
extra cost of a 3/8" seal. The channels also prevent the sealant
from being completely flattened out by the upper log, so when movement
occurs in the logs, a sufficient amount of sealant is still able
to flex. The remaining four channels are designed to accommodate
the asphalt impregnated foam tape. The foam tape provides insulation
value and when compressed 50% it becomes waterproof.
The thermal performance can be compared to a thermal pane window:
if the six seals represent six panes of glass, the trapped air
space between the glass will act as an insulator. Each section
of dead air space between the tongue and groove seals reacts in
the same way thereby improving thermal performance.
 The
Thermo-groove six-seal tongue and groove system enhances thermal
performance and significantly improves the sealing capabilities
of the tongue and groove joints between the logs.
The original three seal tongue and groove system, as shown to
the right, is used with our 6" x 12" log construction.
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