First off, I doubt if taping the flexwatt to the top of the cage is a good idea.
Hot air rises, and the cage floor will be cold.
Switch to sides, front, and rear of cage using 3/4 plywood instead of MDF, and use a fiberglass panel floor. Then attach the flexwatt beneath that.
This is the easiest way, unless you router out a section of floor. Or cut out an area then use FRP to install the flexwatt under.
Some other suggestions. Do you need it to be 39" deep?
Make sure you can reach the back of the cage safely when Mr Burm is in the cage.
Anything more than an arm in the cage is dangerous.
Also, for heating a large enclosure, consider using a radiant heat panel. Thats what I use for my large cages, and by the end of this year, all my cages, large and small will be outfitted with them. I cant recommend them enough.
Much pricier than flexwatt, but much more efficient, and you can use any materials you want to build with.
Just make sure you really waterproof the MDF, or you'll be building another cage a year from now.
Any other questions, you can post over in the Caging forum.
Bob
