How many sheets of 4x8 foam board do I need for 800 square feet for floor insulation?

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asked Jan 7 in Do it yourself by Calottee (220 points)
How many sheets of 4x8 foam board do I need for 800 square feet for floor insulation?

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answered Jan 7 by Shelde (7,050 points)
A 4x8 sheet of foam will cover 32 square feet so for 800 square feet you'll need 25 sheets of 4x8 foam to cover the 800 square foot floor.

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