Hi, first time posting. We recently bought a log home that was built in the 1930's. It looks like the chinking is some sort of mortar, and is cracked or coming out in places. My question is, is the chinking structural? Meaning if I replace the missing sections with something like Log Jam that's a more flexible material, would that affect the stability of the logs? And is Log Jam recommended, or should I go back with the mortar?