Keep the cage elevated off of the foam so the heat tape is not contacting the foam. Lay down the foam, then use MDF blocks to elevate the cage up off the foam sheet. Then you are for sure fine. I believe the flash point of the foam is printed on the sheet. It is lower than wood but higher than most herp-related temps. Again, leave an adequate air space between heater and foam and it is a non-issue. I leave as little as 1/2 inch air space and have never had a problem. This assumes your are keeping the heat tape to a manageable temp, like no more than 110 deg F.

I use the cheap white foam sold at home depot. The blue may be even better. Even better is Reflectix insulation because it can withstand much higher temps but is also very expensive.
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Mark

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