Question: I have seen lots of questions & answers concerning the various clearances to combustibles. My question is what is the allowable clearance to non-combustible materials? If I install my stove near a basement concrete foundation wall there must be a different rule, no? Answer: Assuming the wall is concrete with no wood behind it, there is no clearance needed. In practice, a few inches is good for assuring good air flow and heat transfer from the rear of the stove.