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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.

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What questions should you ask an insulation contractor?

What should you ask before you sign a contract?

Ask each company to confirm five things in writing: their state license and insurance, the installers' certifications, the target R-value the job will reach, whether air-sealing is included, and the total price and scope.

  • License and insuranceConfirm both are current and cover work in your state.
  • Target R-value in writingThe one number every bid should be held to equally.
  • Is air sealing included?If a contractor won't air-seal first, ENERGY STAR says call someone else.
What should you ask before you sign a contract?
Red flags to walk away from

A company that treats the R-value as a vague "we'll fill it up" is one you cannot hold to a standard - and the R-value is the one number the FTC's rule exists to protect. Ask for documentation at the end of the job showing the R-value actually achieved.

What are the red flags?

The FTC lists demands for an on-the-spot decision, and requests to pay the whole job up front or in cash, as classic home-improvement scam signs. Other warning signs: no verifiable state license or proof of insurance, no written scope, and no documentation promised at the end of the job.

Sources

2 cited
  1. What to verify before signing, and R-Value Rule disclosure: ENERGY STAR, How to Hire an Attic Insulation Contractor, 2024; Federal Trade Commission, Final Amendments to the R-Value Rule for Home Insulation, 2018 (checked 2026-08-19).
  2. Home-improvement fraud red flags: Federal Trade Commission, Spot and Avoid Home-Related Fraud, 2022 (checked 2026-08-19).
How it works

How blown-in insulation is actually installed

Four steps, done in order. The Department of Energy is explicit that skipping the air-sealing step is the most common way a new insulation job still leaves an attic underperforming.

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  1. 1

    Air seal first

    The EPA recommends sealing attic-floor penetrations before insulating, because loose-fill does not stop air moving through gaps around wiring, pipes and fixtures.

  2. 2

    Add baffles and depth markers

    Rafter baffles keep blown material off the eaves where it could get wet, and depth rulers mark the target R-value before the blower starts.

  3. 3

    Blow to depth

    A pneumatic machine feeds loose fiberglass or cellulose over the attic floor, covering the tops of the joists so heat cannot bypass the insulation.

  4. 4

    Verify and clean up

    The settled depth gets checked against the target R-value for your climate zone, then tools and debris are cleared.

How we work

What this site will and will not do

We explain the R-value target and the real cost drivers first, and we do not sell you the installation - which is why we can say plainly when topping up beats a full replacement.

01

R-value before a quote

ENERGY STAR recommends R-30 to R-60 depending on your climate zone. Knowing your target before you call means you can hold every bid to the same number.

02

Air sealing first, always

The Department of Energy is explicit that insulation slows heat flow but does not stop air leaks - sealing gaps first is what makes the insulation you pay for actually perform.

03

We are not the installer

We do not install anything ourselves, so we have nothing to gain from steering you toward the bigger job. Licensed local companies do the work and quote it themselves.

04

Nothing we cannot source

Every figure on this site traces to a named, dated source - HomeAdvisor, the DOE, ENERGY STAR, the EPA or the FTC. Where we have not sourced a number, we say so instead of guessing.

Questions

Frequently asked

The questions people actually type before calling a company.

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What should an insulation quote include?

A clear scope in writing: the target R-value, the material, whether air-sealing and attic-hatch insulation are included, and the total price. The contractor should also document the R-value actually achieved at the end of the job.

What's a red flag when hiring an insulation contractor?

Pressure to decide on the spot or pay the full job upfront in cash, no verifiable license or insurance, and no willingness to commit to a specific R-value target.

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