This is kind of embarrassing but thought I should bring it up for safety reasons. The other day I noticed a bulge on one of my Holz Haufens. I tried pushing it back in when the whole side came down like Mt. St. Helens blowing out its side. No, I wasn't buried or hurt, but it sure left a mess. I think that one area wasn't properly stacked downward in towards the middle. I'm not giving up on this just yet. It's going to be restacked but only 7' tall instead of 8'. The other HH seems fine and very sturdy I hope! Oh, and btw this gave me a chance to find out how the inner pieces are drying out. They are the same as the outer pieces.