Remove it, or add over it?
A five-step test. Most attics keep the old material, and the difference is a few thousand dollars.
A working reference, reviewed August 2026
The independent reference for attic insulation
Most homeowners pricing insulation removal do not need removal. They need depth added over what is already there, at a fraction of the cost.
Two questions decide nearly everything: what is on your attic floor now, and what your climate zone calls for. This site answers both from named public data, and shows the working.
Every number here is sourced and dated, and when the honest answer is that you do not need the work, the page says so. We do not sell insulation and we do not install it, which is why it can.
Sourced from U.S. Department of EnergyENERGY STARPNNL climate zone dataU.S. Census BureauBureau of Labor Statistics2021 IECCEPACDC How we research this
Contents
When material genuinely has to come out (rodents, mold, water), the special case of vermiculite, what removal costs, and the five-step test that saves most attics the expense.
Installed prices built from checkable parts: BLS wage data, published bag coverage and retail material prices, with every estimate labeled as one.
Blown fiberglass, cellulose, mineral wool, batts and foam, compared on the numbers that matter and on where each one fails.
The other half of the house. Whether a closed wall can be filled without opening it, what that job involves, and why the attic is usually the better first spend.
The zone targets, the per-inch charts, and the difference between an ENERGY STAR recommendation, the model code, and what your state actually enforces.
Insulation resists conduction. It does nothing about air moving through the ceiling, which is why sealing usually returns more per dollar than depth does, and why it has to happen first.
How much net free area an attic needs, how intake and exhaust split, and why an insulation job is the moment ventilation most often gets broken.
The order the work has to happen in: air seal, then baffles, then depth. Doing it the other way round buries the two cheap steps that make the expensive one work.
Calculators that take your ZIP, your attic and your measurements, and return targets, depths and cost brackets with every input sourced.
The numbers behind every page, published as citable assets: state-grain cost from named inputs, what each state actually enforces, and a ledger of the errors the market keeps repeating.
Need it done instead?
Tell us the job and your ZIP, and we pass it to a licensed insulation contractor who works in your area. Free, and the sections above are how you check the quote.
Start with the decision, not the product
The expensive mistakes in this trade are decisions, not materials. These three guides carry the decisions that show up in real quotes most often.
Is this vermiculite?
How to recognize it without touching it, and why leaving it undisturbed is usually the correct first move.
Is this quote fair?
What an installed price is made of, and the line items that explain most of the spread between quotes.
Get quotes from licensed insulation contractors
Tell us the job and your ZIP. We pass it to a licensed contractor who works in your area.
A marketing service, not a licensed contractor. Insulation work is performed by independent licensed local contractors.
- What does it cost?
- A 1,200 square foot attic blown to R-49 runs about $2,600 to $3,200 installed, from this site's own cost model dated August 2026. Two of its parts are estimates, so read it as a range and not a quote. See the full working and the price by attic size.
- What happens next?
- Your request goes to a licensed insulation contractor near you, usually within about an hour during the day.