Posted By RogerW on 01/12/2009 3:06 PM
Looking at the photo of the contoured insulated slab earlier in this post, I get the impression that the relatively mild uneveness of my slab is nothing to worry about with rigid insulation, but I can't see if the insulation in the photo is broken and cracked all over - and how do I judge if that even matters!?
Mostly there were no cracks or breaks. In a few areas where I bent the board, say something like 3" or 4" in a foot or so of distance the board would break. But Dow boards have a plastic film on both sides which holds it together pretty well even if it does break. I don't recall any cracking. It either bends or breaks. In a few instances I deliberately cut the board on one side so it would bend better, but that was in only a very few instances. Most all of the bends you see in the pic are bends without breaks.