Gaps
between logs - a common problem with many log homes
Over time, as moisture slowly evaporates
from logs in a wall, they can shrink and create gaps. These gaps can cause
drafts that reduce energy efficiency. They allow moisture to collect between
logs increasing the possibility of decay and create entry points for all
kinds of wood boring or nesting insects.
Many log homeowners purchase silicone to
caulk areas that have large gaps. In many cases there is a good possibility
that this will fail. Sometimes this situation may be even worse than doing
nothing at all because moisture will enter openings in the failed caulking
and will not evaporate as quickly. This will greatly increase the likelihood
of decay and insect problems.
Some common elements are essential for
caulking success
First, you should select a caulking specifically
designed for log homes. The logs should be free of dirt and oils. One of
the most important elements of caulking is the use of backer rods in the
log joints. A backer rod acts as filler which reduces the amount of caulking
and acts as an insulator. But most importantly a backer rod will allow
the caulking to adhere to two points, the log above the joint and the log
below. The caulking will not adhere to the backer rod. This allows the
caulking to stretch like a rubber band. Without a backer rod the caulking
will adhere to the top and bottom log plus the area inside the joint. This
is called three point adhesion. If the gap expands it is very likely the
caulk or substrate (the log surface) will fail.
What can you do if you have a milled,
chinkless log home with drafts and gaps between your logs?
First, your logs need to be cleaned. If
you know what finish is on your logs you should contact the caulking manufacturer
for compatibility. Most finishes are compatible. If you do not know the
finish, you can test the caulk with your existing finish or have it stripped,
followed by a borate application then re-stain with a compatible stain.
Once the logs are ready you can begin caulking using a backer rod wherever
possible. If some gaps are too small to accept a backer rod, it is acceptable
to caulk assuming your log home has had adequate time to settle.
Caulking is a good investment
Whether you plan to do the work yourself
or hire a log home professional caulking your log home will greatly increase
energy efficiency while eliminating water and insect infiltration. You
can find very helpful information on many different websites from log home
professionals or manufacturers of log home caulking products such as Sashco
and Perma-Chink. The benefits will be well worth the time and money spent.
(Diagram from Schroeder Log Home Supply,
Inc. website)
This article was written by Tom Tydeman,
a Certified Log Inspector and owner of Log
Options, LLC
www.logoptions.com
