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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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How many sheets of this would I need for a 24-ft fifth wheel camper with a 14 ft pop out


To calculate; 24' x Height(ft) = ? square feet Two sides - multiply by 2 Same with the short sides and pop out. Total = square feet ? Divide by 32 (each sheet is 4' x 8')

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