Attic insulation guides, from R-value to the final quote
Cost, materials, DIY versus professional, how the work is done, and how to choose a company - each on its own page.
Every guide
Asbestos and vermiculite insulation: what to know before you disturb it
Older vermiculite attic insulation may contain asbestos and needs testing before disturbance. See what abatement typically costs if it's confirmed.
Read guide →
Air sealing your attic before you insulate
The DOE recommends air sealing attic penetrations before insulating - it can save 5-30% of annual energy use. See what to seal and why it comes first.
Read guide →
How much does attic insulation removal cost?
Removing old attic insulation costs $1-$2 per sq ft, about $600-$1,200 for a typical attic. See what pushes the price higher, like asbestos or mold.
Read guide →
When is attic insulation removal actually worth it?
You usually don't need to remove old attic insulation before topping up. See when removal is actually worth paying for - moisture, mold, or pests.
Read guide →
Blown-in cellulose vs fiberglass: which one insulates better?
Cellulose gives R-3.2-R-3.8 per inch vs fiberglass's R-2.2-R-2.7, but settles ~13%. Compare R-value, settling, moisture and cost.
Read guide →
What does blown-in insulation cost per square foot?
Blown-in insulation costs $0.50-$2.30 per square foot by material. See fiberglass vs cellulose pricing and what a typical attic job runs.
Read guide →
How deep does blown-in insulation need to be for its rated R-value?
Blown-in fiberglass gives R-2.2-R-2.7 per inch; cellulose gives R-3.2-R-3.8. See how depth, settling, and R-value work together.
Read guide →
Blown-in vs batt insulation: which fits your attic?
Blown-in fills gaps around obstructions; batts must be hand-cut. Compare coverage, R-value per inch, and where each works best in an attic.
Read guide →
How to choose a blown-in insulation company
Choosing a blown-in insulation company? Learn the licensing, insurance, and BPI credentials to check, how to compare quotes on R-value, and red flags to avoid.
Read guide →
Is it cheaper to top up or fully replace attic insulation?
Replacing attic insulation averages ~$1,852 for remove-and-replace. See when topping up is cheaper and when full replacement is worth it.
Read guide →
How much does attic insulation cost?
Attic insulation typically costs $1,700-$2,500 installed, about $1-$3 per square foot. Compare 2026 prices by material, blown-in cost, and removal costs.
Read guide →
DIY vs professional blown-in insulation: which makes sense?
Thinking about do-it-yourself blown-in insulation? Compare DIY material costs, blower rental, and attic safety against hiring a licensed pro before you start.
Read guide →
Attic insulation: a complete guide to blown-in and more
Blown-in insulation explained, plus DOE and ENERGY STAR attic R-values by climate zone and why to air-seal first. An independent, source-cited homeowner guide.
Read guide →
How much attic insulation do I actually need?
ENERGY STAR recommends R-30 to R-60 for attics depending on climate zone. See the target for your zone and how many bags of blown-in that takes.
Read guide →
What questions should you ask an insulation contractor?
Ask about R-value target, air sealing, licensing and BPI certification before hiring. See the five things worth confirming in writing.
Read guide →
How long does blown-in insulation last, and how is it installed?
Blown-in insulation has no fixed expiration date. See what really drives its lifespan (moisture, settling, pests), how it's installed, and when to top up.
Read guide →
How close can insulation get to a recessed light?
Keep loose-fill insulation 3 inches from non-IC recessed lights, or build a barrier. IC-rated fixtures can be covered directly. Here's the rule.
Read guide →
Renting a blown-in insulation machine, step by step
Blown-in insulation blowers rent for about $100-$200 a day, sometimes free with bulk bag purchase. See what to expect before you rent one.
Read guide →
What are the clearest signs attic insulation needs replacing?
Wet or matted insulation, coverage below the joists, and rodent trails are the clearest signs attic insulation needs topping up or replacing.
Read guide →
How much does spray foam attic insulation cost?
Spray foam attic insulation costs $2-$5 per square foot, the highest of common materials. See why it costs more than blown-in and where it earns the premium.
Read guide →
Spray foam vs blown-in insulation: is foam worth the extra cost?
Closed-cell spray foam gives R-6-R-7 per inch and air-seals as it cures. Compare it to blown-in fiberglass and cellulose on cost and where each wins.
Read guide →
Can you top up attic insulation instead of replacing it?
You can usually blow new insulation over existing material if it's dry and sound. See ENERGY STAR's topping-up targets and when to air seal first.
Read guide →Attic insulation types compared: blown-in, batts, and spray foam
Compare blown-in fiberglass vs cellulose insulation, plus batts and spray foam - R-value per inch, cost, and where each fits. Get matched with a local company.
Read guide →What are the main types of blown-in attic insulation?
Three materials get blown into attics: fiberglass, cellulose, and mineral wool. Compare R-value per inch, settling, and where each fits.
Read guide →