I have red cedar log home and have had nothing but problems since built in 1992. the south side catches all the weather and I can’t keep any product on it to last beyond year. The logs just keep checking and sometimes just a small check but in winter when water is within this crack and when it freezes then it’s like another layer comes loose and then when it rains water gets through and travels inside and then runs into other cracks or comes to a knot and water weeps down inside of logs and le
Is it caulked on the exterior? If not I would recommend that it be done, but do not fill all of the checks. If you have larger checks that hold water and freeze try drilling a small hole up from the bottom of the log to allow it to drain. You do not want to fill all of the checks with caulk.