Q:

How many rolls of insulation do I need?

A:

Determine the square footage to be covered with insulation by measuring the height and width of the surface and multiplying those numbers. An 8-foot by 10-foot wall would be 80 square feet and would require two rolls of insulation at 40 square feet each.

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Rolls of insulation come in mineral fibers such as fiberglass and rock wool, divided into pre-sized segments called batts. The rolls are available in different widths to fit standard wall stud and floor joist spacing. A 2-inch by 4-inch stud wall can hold R-13 or R-15 batts. A 2-inch by 6-inch stud wall can use R-19 or R-21 batts.

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