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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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Wooden shed with metal roof. 100 deg temp is norm. Should I leave air gap and glue to 2x4 or btw 2x4's? Also should I double up sheets?


An air gap is only necessary when using Insulfoam's R-Tech Product. With the metallic facer being installed towards the air gap, it increases the overall R-Value of the board. If you are using unfaced product, an air gap is not necessary. Doubling up sheets is completely up to you. More insulation is never a bad thing, but it depends on how much thermal comfort you are looking to add.

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