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.
Gaps
between logs - a common problem with many log
homes