"Michael Baugh" wrote in message

And the part about disintegration. Put some Styrofoam insulation out in
the
sun for a few months/years. It degrades. Many of the insulated doors
depend
on the continued integrity of the foam panels. I'm just not sure that you
need an insulated door.

Foam (and many other materials) exposed to the UV rays of the sun will
slowly degrade, but sandwiched in a door, there are no UV rays.