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R- 7.8 , 2-in x 4-ft x 8-ft Faced Polystyrene Board Insulation

Perma "R" Products R- 7.8 , 2-in x 4-ft x 8-ft Faced Polystyrene Board Insulation

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Someone used this under their inflatable hot tub outside, did it hold up? Any reason to put some on top of the lid as well & cover with tarp?