Tiger foam is light enough to use in the attic. I would not worry about it caving in. Once cured it is self-supporting. On my kitchen project I covered the ceiling with 3 to 4 inches of foam followed by 8 inches of loose cellulose. (I will add more cellulose after I do other rooms.)
For the heating of the tanks- I heated the first kit with a ceramic heater in a small closet for a day before use. The next two kits, I planned ahead and used them during a heat wave in August, no heating required.
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