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Installing Sand for a Pool Base

How much Styrofoam do I need to buy for an 18 foot round pool? Great idea!

By Debra M from Jersey Shore

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July 23, 20100 found this helpful

Well, if you are looking for the area of the 18 foot circle the formula is pi times radius squared.

That would be 3.14 times 9 feet squared. Or 3.14 times 81 or 254.34 square feet. So you could round it up to 255 square feet. If the sheets of styrofoam are 4 by 8 feet you will need 8 sheets.

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