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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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My crawlspace is 196 linear feet long. How many Batts of R15 comfort rockwool (57.9 sqft) will I need to insulate the rim joist?