Quote Originally Posted by TekWarren
I've had my racks built with an extra 1/8 gap. I setup the FW directly on the shelf and then I put in a 1/8 particle material (its reminds me of cardboard but its not...can't remember the exact name). Anyway this keeps my FW in place and even helps spread the heat a little better. I didn't like the way the tubs where sliding directly over it and this was an easy fix.

I would also not to worry about FW with a quality controller. Honestly I'd be more worried about those zoomed heat pads that are not on a automated tstat.
You're not putting the 1/8 particle material directly over the flexwatt are you? Compressing flexwatt between two surfaces is a bad idea ... be careful.

I've seen bad things happen with setups like that.

Just trying to help.

-adam