I know there is a lot of info and a lot of threads about flexwatt. but after reading them, I'm a bit confused about something. I've read, from MANY sources, that flexwatt must not be sandwiched between two things, for instance, between a shelf and the bottom of an enclosure, or between the bottom of an enclosure and a piece of tile, etc. That it MUST have space on at least one side so that air may get to it, and to avoid overheating. Ok, THAT makes sense, except for : Flexwatt was apparently designed to be used to heat floor tile. In that application, its put directly on the sub floor and covered with tile. So , when used for its intended purpose, there is no air gap. So.......if its intended to be used sandwiched directly between two items, why does it overheat if sandwiched between two items?