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The log jam chinking on my 15 year old cabin is breaking away from the logs along the bottom edge of the 4” chinked joint between the logs. The cabin construction consists of logs with 4” 2x4 spacers and foam insulation between the logs. The “chinking” system consisted of a 1/2” in foam covered with log jam. What is causing the log jam to break away from the logs along the bottom edge of the chinking?

More than likely it was not properly installed and will probably need to be removed and re-installed.  If it wasn't troweled in and seated properly it would fail over time.

It could also be that the foam is the wrong kind and is gassing formaldehyde  causing the chinking to bubble and push away from the log.  It needs to be a closed cell foam.  I prefer to use Grip Strip.

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