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Hello all.  First time posting here, so if anyone can provide a little advice or direct me to a previous post on this topic, many, many thanks!  I've recently moved into a 10 year-old log home (yellow pine D-logs) with a two-story stone and mortar chimney running top to bottom on the sunny end of the house.  There is a gap of 0.25" to .5" between the D-logs and the mortar where the logs have pulled back from the chimney on the outside of the house.  I'm guessing that this end of the house has done most of the shrinking that it will do for a while, so I'd like to caulk this gap to discourage the bugs and moisture.  I'll get ahold of enough backing rod to push into the gap, but can anyone recommend the best caulk to run between stone mortar and logs?  I don't anticipate heat from the chimney being a factor in these areas.  I'm in Ohio, with hot summers and freezing winters, if that matters.  - Cheers!


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Hey, Guy. Just some quick advice on types to consider:

Acrylic latex caulks generally have the most elasticity to them. Stay away from silicones, which have no elasticity and don't stick well to wood.

There are several textured caulks on the market made specifically for log homes, and which would do a nice job of sealing that area between your chimney & logs. Stick with those formulated for log homes, since they usually have more elasticity to them than others you can find in the big boxes (not to mention lifetime warranties on many of them.)

Finally - make sure that whatever finish you have on the logs is compatible with the caulk you'll be using. It would be a big bummer for you to get up there & apply it, only to have it fall out. Most caulking manufacturers can tell you what will or won't be compatible with their products.

Hope that helps some! Cheers to you!

Charis w/ Sashco - -
Sashco calking is good stuff, you can't go wrong there.
Another alternative is to use the small tubes of chinking.

The chinking can look just like the mortar.
Hey, how did the repairs work out? If you need help, let me know. We are based in SW Ohio. Wayne
Sorry for not responding sooner. I decided to start out simply, and used 3/8" to 1/2" foam backing rod, followed by a couple of tubes of DAP Alex Plus acrylic/latex clear. It may not be what the pros would recommend, but this is what I had at hand to get the job done on a Saturday afternoon before several days of rain set in. So far, it looks great and seems to be adhering well to both surfaces. I figure worst case it doesn't properly adhere and I'm out $15 in materials and an hour labor, and I'll go back and dig it out and invest in some better caulk. If the adhesion suffers after the first winter, I'll post a follow up to let folks know that this experiment was a flop.



Hello Guy,

How did your repairs work out? Did this solve your problems?

As you can see from the responses here, today's chinking products can work very well in this situation as long as the movement isn't too excessive. Triple Stretch Chinking is a good choice as well.

However, our Mortar Match product is designed specifically for this application as Scott says. It is a cousin of the Triple Stretch product but has a little different formula that allows it to stretch better.

Hope you can close the gaps and prevent the air and water from causing bigger issues.



Perma-Chink will work.
The problem you face is a common one... the home settles but the fireplace chimney stays stationary. This results in the gaps you have seen. Once properly filled (backer rod and log home caulking type product) you shouldn't have to do this again. Best wishes!

 I think one of the best products that I have found for chinking between the logs and the chimney is a product called Mortar Match by Weatherall Co.   It is a very high performance textured caulk with a heavier aggregate that gives the appearance of mortar.    If the gap is small enough I will lay a ½ “ bead of Mortar Match on the seam between the mortar and the log.  I will sometimes put a slight skim coat on the mortar joint just to stabilize it if it appears to be loose or cracking.   The best color I have found for this application is “Southern Grey” It is a dead match for most mortar although almost any grey will work as it will eventually blend in with the mortar joint over time.  I use this on chimneys, log fireplace mantels and wherever rock work meets with the logs.   It can also be used as a high performance tuck pointing material between stone veneer and faux stone panels.   If the gap between the logs and the mortar is fairly wide I install backer rod or expanding foam and go over the gap with the mortar match product.  For more information on this product click on link below

If you need samples or have questions on application you can contact me at

Scott M.

800 490-3695

“The Leading Distributor of Log Home Products”


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