Have you seen the available radiant heat panels? So much easier. A 40 watt panel will do nicely in your cage. Just look on the classifieds or on the banner on this page!

If you do use Flexwatt under the floor, I agree to use expanded PVC. In the cage plywood floor, cut out a rectangle about 2 inches longer/wider than the Flexwatt. Cover the entire floor with the PVC. Tape Flexwatt to the underside of the PVC in the cutout. Use aluminum tape. Or velcro dots.
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Mark

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