Question 1

How much does attic insulation cost?

Accepted Answer

For a 1,000 sq ft attic: blown-in fiberglass runs $1,500–$3,500; cellulose $1,700–$3,800; fiberglass batts $1,200–$2,800; spray foam $3,000–$7,500 installed.

Question 2

What R-value do I need?

Accepted Answer

Most U.S. climates call for R-38 to R-60 in the attic. Your state energy code and utility rebate program specify the target for your ZIP code.

Question 3

Is removing old insulation required?

Accepted Answer

Not always. If the old insulation is wet, contaminated or compressed, removal ($1–$2 per sq ft) is usually recommended before adding new material.

Question 4

Does air sealing matter more than insulation?

Accepted Answer

Often yes: sealing gaps around lights, fans and top plates before insulating is the highest-return part of an attic project.

Attic Insulation Cost in Idaho

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