Disclaimer

Our calculators produce planning estimates. They are not stamped engineering, an energy audit, or a code compliance document. Local energy code, fire code and ventilation requirements always take precedence.

Coverage ratings vary between brands and between R-values within one brand. Always check the bag or box chart, and measure twice before placing a large order.

Insulation work involves respirable fibers, chemical foams, hot attics, buried wiring and unguarded joists. Wear a respirator, eye protection and gloves, keep insulation clear of recessed cans and flues unless they are rated for contact, and never work alone in a hot attic.

Cost figures are 2026 national estimates and will not match your local quote. Get at least three bids for contractor work.