US attic insulation · quote workbench
Attic insulation cost calculator
Count whole packages from verified coverage, expose every quote component and compare like-for-like options.
A 1,000 ft² attic with 10% waste needs 21 packages when each package covers 53.33 ft². At the checked regional snapshot of $63.88 per package, that is $1,341.48 material-only before tax, labor, air sealing, removal, baffles, access or permits. This is dated arithmetic, not a US average or contractor quote.
Attic scope
Start with exact area and package coverage, then enter the quote you can verify.
Compare up to three options
Keep area and project scope constant while changing coverage, minimum order or price.
| Option | Units ordered | Material | Final R | Out of pocket | |
|---|---|---|---|---|---|
| Save up to three like-for-like product or quote options. | |||||
Open method
A quote model with nothing hidden
units required = ceil(adjusted area / coverage per unit)
units ordered = max(units required, minimum order)
materials = units ordered × price per unit
out of pocket = max(0, subtotal + tax − confirmed rebate)
What the result does not decide
It does not choose an R-value, inspect existing insulation, decide code compliance, diagnose moisture or asbestos risk, validate contractor scope, determine rebate eligibility or estimate annual energy savings.
Sources checked
- Recommended Home Insulation R-Values — ENERGY STAR / U.S. Environmental Protection Agency. Retrofit recommendations for existing wood-framed buildings; source notes a 2021 IECC basis.
- Adding Attic Insulation — ENERGY STAR / U.S. Environmental Protection Agency. General attic-insulation and air-sealing sequence; not a project quotation.
- ProPink L77 coverage calculator — Owens Corning. Manufacturer coverage rows; local bag price remains a user input.
- Johns Manville fiberglass loose-fill environmental product declaration — Johns Manville / UL Environment. Manufacturer product description and R-30 coverage statement.
- Owens Corning C84A R-30 unfaced batt retail listing — Dunn Lumber. Regional retail snapshot; price and availability vary by date and location.
- Johns Manville Climate Pro B-7700 retail listing — Foundation Building Materials. Distributor snapshot with a 39-bag minimum order; price and availability vary by branch and date.
Reusable evidence
Coverage, quote worksheet and source ledger
Download the factual rows separately from your calculated project export.
| Product | Added R | Coverage / unit | Price snapshot | Minimum | Checked |
|---|---|---|---|---|---|
| Owens Corning C84A R-30 unfaced fiberglass batts | R-30 | 53.33 ft² | $63.88 | 1 | 2026-08-29 |
| Johns Manville Climate Pro B-7700 loose-fill fiberglass | R-30 | 77.00 ft² | $66.00 | 39 | 2026-08-29 |
| Owens Corning ProPink L77 loose-fill fiberglass | R-30 | 77.00 ft² | User input | 1 | 2026-08-29 |
Prices and availability vary by branch, date, dimensions and application. A manufacturer coverage row without an accessible retail price deliberately shows “User input.”
Questions answered
Attic cost questions
How many insulation packages do I need for a 1,000-square-foot attic?
At 53.33 square feet per package and a 10% waste allowance, the calculator divides 1,100 by 53.33 and rounds up to 21 packages. Coverage and R-value must come from the exact product and application.
What should an attic insulation cost estimate include?
Keep materials, air sealing, removal and disposal, baffles or ventilation work, labor, permits or assessments, tax, other confirmed costs and confirmed rebates separate so quotes can be compared on the same scope.
Does the calculator use a national average insulation price?
No. Its examples are dated regional product snapshots or manufacturer coverage rows. Replace package price, coverage, minimum order and every quote component with current local evidence.
Does adding R-30 mean the attic meets an R-49 target?
Only if existing insulation contributes at least R-19 and remains effective. The calculator adds entered nominal R-values and displays any gap, but it does not inspect installation quality, compression, air leakage, moisture or local code.