According to Dr. Joe, that doesn't happen in heated basements: http://www.buildingscience.com/document ... l-trouble/ Thanks for the link Jim, that was a good read and very informative. Also, a lot of it pertains to this neck of the woods. I need to follow the other links posted in the footnotes. Not that I'll ever run into this situation but he did make mention of unheated basement with a rubble foundation. So, why in cases where we have unheated foundations and frost susceptible soils we still donââ¬â¢t have many problems? Well, mostly luck and some unexpected and under-appreciated drainage. With many rubble foundations, we dodge the adfreezing bullet and lateral frost heave forces because the rubble foundation wall is a pretty good drainage medium Any thoughts on CMU as compared to? Last point, whenever I see a horizontal crack a few courses down, running much of the length of the wall, I always assumed it was due to poor compaction (although to much being the case), poor drainage with expansive soils with frost heave. It would appear that frost heave is not the problem now so what would you think is the major cause?