Belly heating a 1/2" pvc enclusure

[LarryS]

For those you with 1/2" thick caging, are you finding that the heat from a UTH or heat tape adequately penetrates the material? Also do the stick on UTH's stay put on the bottom of the cage?

Most of my research has shown that people prefer a thinner cage bottom for heating, but here on this forum I see several mention using this setup on the full thickness with no issues.

It as always advisable to provide an air gap under belly heated cages, so would "feet" on the bottom of the cage for this purpose be something that would be a welcome feature?
This could also be a benefit for overhead heated cages to minimize heat transfer.
How thick are the more popular heat pads?

I'm thinking that the feet could interlock in the cage below for stacking and also provide the air gap.

Thank you in advance for any and all feedback.

Larry