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ARMORTHANE PROTECTING YOUR WORLD

PROTECTING YOUR WORLD

ARMORTHANE PROTECTING YOUR WORLD

Spray Foam
Insulation
Contractors

How to vet and hire one: what a real quote lists, what the certifications mean, fair 2026 prices and the red flags. We make spray foam and train installers.
Spray Foam Quotes

Want a spray foam job quoted the right way? Get a quote from a certified applicator.

Tell us what you're insulating and where you are. We'll connect you with an ArmorThane-certified spray foam applicator who puts the product, thickness, board feet and R-value in writing before anyone sprays.

  • Attics, walls, crawl spaces, pole barns and shops
  • Open-cell or closed-cell, with the reason in writing
  • Thickness, board feet and R-value on the quote
  • Contractors: ask about ArmorFoam, rigs and training
Rather talk now? Call (417) 831-5090
Step 1 of 3
$0.60–$1.60
Per board foot, open-cell, installed
Angi, September 2026
$1.30–$3.10
Per board foot, closed-cell, installed
Angi, September 2026
24 hrs
Common re-occupancy time after spraying
EPA, ACC and BASF guidance
100,000 BF
Sprayed before SPFA's Installer level
SPFA certification program

Spray foam is one of the few home improvements where the installer makes the product on site. Two chemicals meet in a heated gun, react on your wall and become insulation. Get the ratio, temperature or thickness wrong and you can't return it. That's why picking the contractor matters more here than almost anywhere else in the house.

Quick answer

Hire a spray foam contractor who is licensed where your state or city requires it, insured, and trained on the exact product they spray, ideally with SPFA certification on the crew. Get three written quotes that each list the product, open- or closed-cell, thickness by area, board feet and installed R-value (Angi and the energy code both call for this). Expect about $0.60–$1.60 per board foot for open-cell and $1.30–$3.10 for closed-cell installed (Angi, 2026), a minimum job fee of $1,000–$2,000 or more at many companies (HomeGuide), and plan to stay out of the house for about 24 hours after spraying. Score a contractor or check a quote.

Most "how to hire an insulation contractor" articles stop at "check reviews." That's not enough for spray foam. The things that decide whether a foam job works, like pass thickness, mix ratio, substrate moisture and the ignition barrier plan, don't show up in a five-star review. They show up in the quote, in the certifications and in what happens on the day.

A word about who's writing. ArmorThane makes ArmorFoam spray foam in Springfield, Missouri, and we've trained and supplied spray applicators for more than 35 years. We see the jobs that go right and the callbacks that don't. This guide is the checklist we'd hand a family member before they let anyone spray their house, including our own applicators.

What's in this guide
  1. 1Contractor scorecard (interactive)
  2. 2Is this spray foam quote fair? (interactive)
  3. 3Spray foam certifications, explained
  4. 4Licensing, insurance and the contract
  5. 5What a real spray foam quote lists
  6. 6Code items your contractor should raise
  7. 7Re-entry and re-occupancy times
  8. 8What good installation looks like
  9. 9Red flags and warranty fine print
  10. 10Questions to ask before you sign
  11. 11What spray foam contractors charge
  12. 12Spray foam contractor FAQ
Interactive tool 1 of 2

Spray foam contractor scorecard

Tick what the contractor has actually shown you, not what they promised on the phone. Items are weighted by how much they matter on a spray foam job. A missing insurance certificate matters more than a missing brochure.

Scorecard

How does this contractor stack up?

Score one contractor at a time. Anything below 70 deserves more questions before a deposit changes hands.

Paperwork
The quote
How they sell
Warning signs (each one costs points)
0
Score out of 100
Not enough yet
Verdict
14
Items still missing

Weights are our judgment, based on the items the FTC, EPA, Angi and the energy code ask homeowners and installers to document. They're a way to organize questions, not a rating of any company.

Interactive tool 2 of 2

Is this spray foam quote fair?

Spray foam is priced by the board foot: one square foot, one inch thick. A quote that only says "$4,800 for the attic" hides the one number that lets you compare it. Enter the area, the foam type and the thickness on the quote, and the checker converts it to board feet and cost per board foot and puts it next to published 2026 ranges.

Quote checker

What am I paying per board foot?

Ranges are installed prices from Angi (September 2026). Small jobs often hit a minimum charge, so a high per-board-foot number on a small job isn't automatically a rip-off.

Wall or roof-deck surface, not floor area
What the quote includes
3,600
Board feet
$1.81
Your price per board foot
$4,680–$11,160
Published range for this job
R-20
Approx. installed R-value

Credentials

Spray foam certifications, explained

There is no single national license for spray foam. What exists is a set of industry certifications, plus the training each foam manufacturer requires before it will warranty its product. Thinking of getting certified yourself? See spray foam insulation training. Here's what the letters mean and how much experience sits behind each one.

CredentialWho issues itWhat it takesWhat it tells you
SPF AssistantSPFA Professional Certification Program (PCP)No spray experience required; written examEntry level. Fine as a helper, not as the person running the gun on your job.
Insulation InstallerSPFA PCP100,000 board feet sprayed; written examSomeone who has sprayed roughly 30–60 average attics' worth of foam and passed the test.
Insulation Master InstallerSPFA PCP500,000 board feet sprayed; written exam plus an over-the-shoulder field examThe strongest individual installer credential. Someone watched them spray.
Insulation Project ManagerSPFA PCPManaged at least 500,000 board feet of projects; written examThe person who should own your job's plan, schedule and safety.
SPFA Company AccreditationSPFAAll field staff PCP-certified; proof of business license, certificate of insurance, written safety program, annual OSHA trainingA company-level check that goes beyond one good installer.
ABAA SPF InstallerAir Barrier Association of America3,000+ hours of work experience (1,500+ in SPF) plus chemical health and safety trainingCommon on commercial air-barrier work. Less common on homes.
BPI certificationBuilding Performance InstituteExams covering the building envelope, HVAC, insulation and ventilationWhole-house thinking. Useful if you want an energy audit alongside the foam.
Manufacturer trainingThe foam maker (ArmorThane, Huntsman, BASF and others)Varies by maker; usually required for the product warrantyWithout it, the material warranty may not apply at all.
SPFA requirements from SPFA's Individual Certification Programs page (updated October 2024) and Company Accreditation page (September 2025). ABAA from its 2026 course listing. Our "attics' worth" comparison assumes about 1,500–3,500 board feet per attic.

How to check a certification

We didn't find a public lookup tool on SPFA's certification pages. So ask the contractor for a copy of each installer's certificate, check that the names match the crew who will actually show up, and if you want to confirm, contact SPFA directly at 800-523-6154 or info@sprayfoam.org. An older SPFA program sheet says certified people have to maintain their status every year and recertify every seven years, so an old certificate is worth a question.

Two more things carry real weight. The U.S. Department of Energy says installing most liquid foam insulation "requires special equipment and certification and should only be done by experienced installers." And the EPA's own checklist for spray foam jobs tells homeowners to review "the training and certification credentials of the project manager, installers, and assistants." You're not being fussy by asking. You're doing what the agencies recommend.

Certified isn't the whole storyA certificate proves someone passed a test and logged hours. It doesn't prove they'll show up with a calibrated rig, test your substrate or tell you when open-cell is the wrong call. Use certifications to narrow the list, then let the quote and the questions below decide.
The paperwork

Licensing, insurance and the contract

The Federal Trade Commission's home-improvement advice starts in one place: "Consider only contractors who are licensed and insured." For spray foam, that sentence needs a little unpacking, because licensing varies a lot by state.

Licensing depends on where you live

Some states license insulation work directly. Arizona, California, Hawaii, Nevada and North Carolina are examples, and California's insulation classification applies to jobs over $1,000. Many others, including Missouri, Kansas, Oklahoma, Texas and Illinois, have no statewide insulation license, so registration and permits happen at the city or county level. Missouri, for example, has no statewide general contractor license at all. Those state lists come from contractor-software compilations, so confirm with your state board or your city's permit office. What matters is simple: if your area requires a license, the number belongs on the contract, and you should look it up yourself.

Insurance: ask for the certificate

A spray foam rig brings heated chemical lines, a generator and overspray into your house. Ask for a certificate of insurance before the job, not a verbal "we're covered." Bob Vila's hiring guide suggests the exact question: "Will you provide a copy of your Certificate of Insurance?" Check that the company name matches the contract and that the policy dates cover your job.

What the FTC says belongs in the contract

  • The contractor's name, address, phone number and license number.
  • Start and finish dates.
  • A written statement of your right to cancel within three business days, where the FTC's cooling-off rule applies.
  • A payment schedule. "Don't pay the full amount for the project up front." Some states cap down payments.

The FTC's list of scam warning signs reads like a checklist of how bad foam jobs get sold: pressure to decide on the spot, demands for payment up front or in cash, contractor-arranged financing and door-knockers who happen to be "in the area." Angi adds three sensible rules: get three written estimates, require an in-home walk-through, and "never pay the entire amount before the job is done."

Reading the quote

What a real spray foam quote lists

If you compare three spray foam quotes and one says "attic, $5,200," another says "attic, spray foam, R-38" and the third lists product, thickness and board feet, only the third one can be checked. Here's what should be on the paper before you sign.

Line on the quoteWhy it mattersIf it's missing
Foam product and manufacturerEvery product has its own R-value, maximum pass thickness, barrier rules and re-occupancy time.Ask. "Closed-cell" isn't a product.
Open-cell or closed-cell, and whyThey behave differently with moisture, vapor and structure. The choice should fit your space and climate.Ask for the reasoning.
Thickness by areaThickness is what you're buying. The energy code requires the installer to list installed thickness.Don't sign.
Board feet or square feet per areaLets you compare quotes on the same basis.Ask or use the checker above.
Installed R-valueRequired on the installer's certificate under the IECC for spray foam.Don't sign.
Evaluation report number (ICC-ES)Shows the product has been evaluated for code use and lists its limits.Ask for the ESR number.
Thermal or ignition barrier planFoam generally has to be covered, or coated with a tested product, depending on where it is.Ask who provides it and what it costs.
Vapor retarder plan (cold climates)Open-cell usually needs a separate vapor retarder in climate zones 5–8.Ask.
Removal of old insulationHomeGuide puts removal at $1.00–$2.50 per sq ft. It's often the biggest surprise.Clarify in writing.
Prep, masking and ventilationThe EPA's checklist covers a restricted work zone, a ventilation plan and temperature and moisture checks.Ask how they'll do it.
Re-occupancy timeMany manufacturers call for about 24 hours before residents return.Get it in writing.
Warranty: material and workmanshipManufacturer warranties usually cover material only. Labor and bad installation fall to the contractor.Ask for both in writing.
Sources: IECC R303.1 installer-certificate rules (via Seattle's amended 2021 code), HomeGuide (Dec. 2025), EPA's SPF contractor checklist, manufacturer warranty terms. See sources below.

What an evaluation report tells you

An ICC-ES evaluation report (the "ESR number") is a public document that spells out how a product may be used under the building code. You can search the ICC-ES directory by report number, product or manufacturer. One example, ESR-5252 for a closed-cell HFO foam, lists R-7.5 at 1 inch and R-41 at 6 inches, allows a maximum of 3.5 inches per pass, and says the product must be installed by "licensed dealers and installers certified by" the manufacturer. Those three facts, R-value, pass limit and who may install it, are exactly what a good contractor should know about the foam they spray.

Code items

Code items a good contractor will bring up first

You don't need to read the building code. But you should notice whether your contractor brings these up without being asked. The ones who do are usually the ones who pass inspection.

IRC R316.4

Thermal barrier in living space

Foam plastic generally has to be separated from the interior by an approved thermal barrier, such as 1/2-inch gypsum board, or a material tested to NFPA 275. Exposed foam in a finished room is a red flag.

IRC R316.5.3

Ignition barrier in attics

Where an attic is entered only for repairs or maintenance, an ignition barrier can substitute. Listed options include 1-1/2 in mineral fiber, 1/4 in wood structural panel, 3/8 in gypsum and 1-1/2 in cellulose, or an approved coating.

IRC R316.5.4

Crawl spaces

Crawl spaces get a similar ignition-barrier list (without the cellulose option). Ask how your crawl space foam will be covered or coated.

IRC R702.7

Vapor retarders

Frame walls in climate zones 5–8 and Marine 4 need a Class I or II vapor retarder on the interior side. Closed-cell reaches Class II at about 1.5 in; open-cell is Class III and needs help.

IECC R303.1

Installer's certificate

For spray foam, the certificate must list installed thickness and the R-value of that thickness, and it's left in a conspicuous place in the building.

IRC R806.5

Unvented attics

Spraying the roof deck turns the attic into conditioned space, which has its own list of conditions. See our attic insulation cost guide.

Section numbers are from the model International Residential Code and IECC as quoted in local-jurisdiction handouts and manufacturer design notes; your state or city may have adopted a different edition or amended it. Your code official has the final word.

Safety

Re-entry and re-occupancy: how long you stay out

This is the question homeowners forget to ask, and the answer tells you a lot about a contractor. Two-part spray foam gives off isocyanate vapors and aerosols while it's being sprayed and while it cures. The EPA calls isocyanates "a leading chemical cause of work-related asthma" and says there is "no recognized safe level of exposure" for people who are already sensitized.

The EPA's guidance is plain: "Building/home occupants and other workers should vacate during SPF installation." It also notes that "some manufacturers recommend 24 hours after application for the two-component high pressure 'professional' SPF system for worker re-entry without the use of PPE and for re-occupancy by residents."

Example product guidanceTrade re-entry (with 20 air changes/hr)Trade re-entry (minimal ventilation)Re-occupancy by residents
BASF open-cell (ENERTITE)2 hours4 hours24 hours
BASF closed-cell (WALLTITE)2 hours8 hours24 hours
Typical high-pressure SPF (ACC)"Generally significantly shorter" than re-occupancyMany manufacturers suggest 24 hours
BASF Tech Tip #17 (May 2024); American Chemistry Council reentry and reoccupancy info sheet. Always follow the specific manufacturer's written instructions for the product on your job.

What that means for your plans

  • Plan on a night away for most whole-room or attic jobs, including pets.
  • Expect the HVAC to be shut off and vents sealed during spraying, as the EPA's safety tips describe, with fans exhausting the work area.
  • Re-entry is not re-occupancy. Trade workers may return in a few hours with ventilation; residents wait longer.
  • A contractor who says you can stay home while they spray is contradicting the EPA, the chemistry industry and the manufacturers. Walk away.

Worried about odor or health after the job? Our spray foam insulation problems guide covers what's normal, what isn't and how off-ratio foam gets fixed.

On the day

What good spray foam installation looks like

You don't need to supervise the crew, but it helps to know what a careful job looks like. Most of the problems we see trace back to one of five things.

  1. They check the surface first

    The EPA checklist includes measuring air and surface temperature, humidity and surface moisture. Foam sprayed on wet or dirty framing is a common cause of shrinking and pulling away.

  2. They spray in passes

    Every product has a maximum thickness per pass. One closed-cell data sheet caps it at 2 inches; another product's evaluation report allows 3.5 inches. Older SPFA guidance suggested 1-1/2 inch lifts with a cool-down between them. Spraying too thick in one pass can crack, split or overheat the foam.

  3. They watch the mix

    Off-ratio foam gives itself away. Too much isocyanate reads brittle, dark or burnt and shrinks; too much resin stays soft, spongy or tacky. Good crews keep A and B pressures close, often within about 100 psi of each other.

  4. They trim, clean and ventilate

    Excess foam gets trimmed, the site gets cleaned and the space gets ventilated before anyone moves back in.

  5. They leave the paperwork

    The installer's certificate with thickness and R-value, the product name and the warranty registration.

Applicator in a protective suit and respirator spraying green spray foam insulation into wall studs with a jobsite heater running
A full-face respirator, protective suit and a controlled work area are normal on a professional spray foam job.

How long the job takes

Fixr's 2025 cost guide estimates 2–3 hours for a small basement, 6–8 hours for a large attic and 3–4 days for an entire house. Add prep and cleanup. If a contractor promises a whole house in a morning, ask how many rigs they're bringing.

Walk-away signs

Red flags and warranty fine print

Red flags in the sale
  • A price with no thickness, board feet or R-value.
  • No product name, or "whatever the supplier has."
  • Full payment or cash up front.
  • Pressure to sign today; "this price is only good while we're in the area."
  • No in-person visit before the quote.
  • No mention of the thermal or ignition barrier in a finished space or attic.
  • You can "stay home while we spray."
Red flags after the job
  • Foam that's brittle, dark or burnt-looking, or soft and sticky.
  • Gaps where foam has pulled away from studs or framing.
  • A chemical or sweet smell that persists beyond the first few days.
  • Thickness well below what the quote listed. A probe or ruler will tell you.
  • No installer's certificate left behind.

Read the warranty the way a lawyer would

Big foam brands advertise lifetime warranties, and they're real, but read what they cover. Huntsman's closed-cell limited lifetime warranty, for example, covers the foam's performance "throughout the life of the building," requires "authorized contractors using trained applicators" and registration within 90 days, and covers material only. Labor, removal and improper installation are excluded. That's why the contractor's own workmanship warranty matters as much as the manufacturer's.

Why this is worth the effortSpray foam done badly is expensive to undo. The usual fix for off-ratio foam is removal back to a clean surface and a respray. NIST researchers studying long-term emissions noted occupant complaints of odor and respiratory symptoms, and cases where homeowners had to sell or abandon their homes. Those cases are rare, but they're the reason the vetting steps above exist.
Before you sign

Questions to ask a spray foam contractor

These come from HomeGuide's and Bob Vila's hiring guides, plus a few we'd add from the manufacturer's side. Listen for specific answers. "Don't worry about it" is not a specific answer.

About the company

  • How long have you been in business?
  • Are you licensed and insured? Can I have your certificate of insurance?
  • Will the work be subcontracted? Who will actually be spraying?
  • Which of your installers are SPFA-certified or manufacturer-trained?
  • Can I call three customers from the last year?

About my job

  • Open-cell or closed-cell for my space, and why?
  • What thickness, what R-value and how many board feet?
  • Does the quote include removing the old insulation?
  • How will you handle the ignition or thermal barrier?
  • Do I need a vapor retarder in my climate?

About the day

  • How long will it take, and how many rigs are coming?
  • How will you protect the rest of the house from overspray?
  • How long does the foam take to cure, and when can we safely re-enter?
  • What will you check before spraying (temperature, moisture)?

About afterward

  • Is there a warranty, and what does it include?
  • Who registers the manufacturer warranty?
  • Will you leave the installer's certificate with thickness and R-value?
  • Do you pull the permit, if one is needed?
Pricing

What spray foam contractors charge in 2026

Published price guides don't agree with each other, mostly because some quote per board foot, some per square foot at an assumed thickness, and some include removal and prep. Here's what each source actually says.

Source (date)Open-cellClosed-cellOther figures
Angi (Sep. 2026)$0.60–$1.60 per BF installed$1.30–$3.10 per BF installedAverage job $2,888; labor $50–$100/hr
HomeAdvisor (Jun. 2026)$0.88–$3.85 per sq ft$1.44–$4.70 per sq ftSmall projects start near $675
HomeGuide (Dec. 2025)$1.50–$3.50 per sq ft$3.00–$5.00 per sq ftMinimum job fees $1,000–$2,000 or more; whole house $8,000–$20,000
Fixr (Jan. 2025)$0.44–$0.65 per BF, material$1.00–$1.50 per BF, materialInstalled $2.75–$6.50 per sq ft new construction
Today's Homeowner (Apr. 2025)1,000 sq ft: $1,400–$2,4001,000 sq ft: $3,500–$5,500Average $2,886
Figures as published by each source on the date shown. BF = board foot (1 sq ft at 1 in thick). Square-foot prices assume the thickness each source uses.

For a full breakdown by room, thickness and foam type, use our spray foam insulation cost calculator. If you're torn between the two foam types, open-cell vs closed-cell walks through where each one earns its price, and our closed-cell guide covers code requirements in depth. Thinking about doing a small area yourself? The DIY spray foam guide compares kit costs per board foot against hiring out.

Why a low bid can cost more

Thickness is the easiest place to cut. Two inches of closed-cell priced as if it were three looks like a bargain until you do the board-foot math. The quote checker above exists for exactly that reason. Get three quotes, convert each to cost per board foot at the thickness listed, and ask the cheapest contractor to explain the gap.

ArmorThane applicators

How ArmorThane-certified applicators quote spray foam

We make ArmorFoam open-cell and closed-cell spray foam, build the spray rigs and train the applicators who use them. When you're connected with an ArmorThane-certified applicator, you should get what this guide asks for: the product, the thickness, the board feet and the R-value in writing, plus a straight answer on whether foam is even the right choice for your space.

Sometimes it isn't. An empty, vented attic is usually cheaper to fix with air sealing and blown-in insulation. A good contractor says so. More on the systems on our spray foam insulation page.

Find a certified applicator →ArmorFoam systems
Technicians receiving hands-on spray foam and polyurea machine training
Hands-on spray foam and machine training at ArmorThane.
R-6.5 / in

ArmorFoam closed-cell

Aged R-value per ASTM C518, about 1.9 lb/ft³ density and 92–96% closed cells. Roughly 5,000 board feet per 55-gallon set.

R-13.6 at 3.5 in

ArmorFoam 0.5 open-cell

Water-blown, 0.5 pcf, for walls and roof decks where sound control and cost per R matter.

In writing

Product, thickness, R-value

The same items the energy code asks the installer to certify. Ask for them before the rig arrives.

For contractors

Want to be the contractor people are looking for?

Homeowners search for spray foam contractors all year. We supply the foam, build the rigs and train your crew on site, so you can quote jobs the way this guide describes. Not a franchise: no franchise fee, no royalties.

Become an applicatorStart a spray foam business

See the equipment: mobile spray foam rigs →

Straight answers

Spray foam contractor FAQ

How do I find a good spray foam insulation contractor?

Start with contractors who are trained on a specific foam brand and, ideally, have SPFA-certified installers on the crew. Get three written quotes after in-person visits, and compare them on product, thickness, board feet and installed R-value. Check the license (where your state or city requires one) and ask for a certificate of insurance. The FTC advises never paying the full amount up front.

How much do spray foam insulation contractors charge?

Angi's September 2026 data puts installed open-cell at $0.60–$1.60 per board foot and closed-cell at $1.30–$3.10 per board foot, with an average job around $2,888. HomeGuide notes minimum job fees of $1,000–$2,000 or more at many companies, so small jobs cost more per board foot.

What certifications should a spray foam installer have?

The main industry credential is the Spray Polyurethane Foam Alliance (SPFA) Professional Certification Program. Its Insulation Installer level requires 100,000 board feet sprayed, and Master Installer requires 500,000 board feet plus a field exam. Manufacturer training matters too, because foam makers usually require it for their warranty. On commercial air-barrier jobs, ABAA certification is common.

Do spray foam contractors need a license?

It depends on your state and city. Some states, such as Arizona, California, Hawaii, Nevada and North Carolina, license insulation work. Others, including Missouri, have no statewide license, so registration and permits are handled locally. If a license is required where you live, the number should be on the contract, and you should look it up yourself.

Can I stay in my house while spray foam is installed?

No. The EPA says occupants should vacate during spray foam installation, and many manufacturers recommend about 24 hours before residents return after a two-component professional application. Follow the specific product's written re-occupancy time, and be wary of any contractor who says you can stay home.

What should a spray foam insulation quote include?

The foam product and manufacturer, open- or closed-cell, thickness for each area, board feet or square feet, installed R-value, the thermal or ignition barrier plan, any vapor retarder, removal of old insulation, prep and ventilation, the re-occupancy time and the warranty terms. The energy code requires the installer to certify installed thickness and R-value for spray foam.

How long does a spray foam installation take?

Fixr estimates 2–3 hours for a small basement, 6–8 hours for a large attic and 3–4 days for a whole house, not counting prep and cleanup. Then allow the manufacturer's re-occupancy time before moving back in.

Is open-cell or closed-cell spray foam better?

Neither is better everywhere. Closed-cell is denser, has a higher R-value per inch and slows vapor at about 1.5–2 inches, which suits crawl spaces, basements, metal buildings and tight cavities. Open-cell costs less per R-value and suits many interior walls and roof decks. A good contractor explains why they picked one for your space. See our open-cell vs closed-cell guide for details.

What are the signs of a bad spray foam job?

Foam that looks brittle, dark or burnt, or stays soft and sticky, can mean the mix was off-ratio. Gaps where foam pulled away from framing, thickness well below what was quoted, and a chemical smell that lasts beyond the first few days are also warning signs. The usual fix for off-ratio foam is removal and a respray.

Does spray foam need to be covered?

Usually. Under the International Residential Code, foam plastic in living space generally needs an approved thermal barrier such as 1/2-inch gypsum board, and attics or crawl spaces entered only for service need an ignition barrier or an approved coating. Your contractor should explain which applies and what it costs.

What warranty should a spray foam contractor offer?

Expect two warranties. Manufacturer warranties often cover the foam's performance for the life of the building but usually cover material only and may require registration, for example within 90 days. The contractor's workmanship warranty covers installation. Get both in writing.

Should I get more than one spray foam quote?

Yes. Angi recommends three written estimates, which helps expose underbidding. Convert each quote to cost per board foot at the thickness listed, so you're comparing the same thing.

AT
ArmorThane Technical Team · Springfield, Missouri
Written from SPFA, EPA, FTC and ICC-ES documents, manufacturer data sheets and warranties, dated 2025–2026 cost guides and 35+ years of making spray foam and training applicators. Last updated September 27, 2026.

Methodology and sources

Prices are shown as each source publishes them, with that source's date. The quote checker uses Angi's September 2026 per-board-foot ranges and approximate R-values of 3.7 per inch for open-cell and 6.5 per inch for closed-cell; your product's data sheet governs. Scorecard weights are our editorial judgment. Code section numbers come from the model IRC and IECC as quoted by local jurisdictions and manufacturers; local amendments may differ. State licensing examples come from a 2026 contractor-software compilation; confirm with your state board. Nothing here is legal advice.

  1. SPFA, Individual Certification Programs (Oct. 2024): sprayfoam.org/pcp/certprogram/
  2. SPFA, Company Accreditation Programs (Sep. 2025): sprayfoam.org/accredprogs/
  3. SPFA, Written and Field Exams (Sep. 2025): sprayfoam.org/exams/
  4. Air Barrier Association of America, SPF Installer Certification course (2026): airbarrier.org
  5. U.S. Department of Energy, Types of Insulation: energy.gov/energysaver/types-insulation
  6. U.S. EPA, Checklist: SPF Contractor-Client Communications (2015): epa.gov (PDF)
  7. U.S. EPA (archive), Vacate and Safe Re-Entry Time for SPF Application (Sep. 2020): archive.epa.gov
  8. U.S. EPA (archive), Health Concerns about SPF (Sep. 2020): archive.epa.gov
  9. American Chemistry Council, Info Sheet on Reentry and Reoccupancy Times: spraypolyurethane.org (PDF)
  10. BASF, Tech Tip #17: Jobsite Ventilation, Re-Occupancy and Re-Entry (May 2024), contractor-hosted copy: PDF
  11. FTC, How To Avoid a Home Improvement Scam (Dec. 2025): consumer.ftc.gov
  12. Angi, 9 Tips to Hiring an Insulation Contractor (Jul. 2026): angi.com
  13. Angi, Spray Foam Insulation Cost (Sep. 2026): angi.com
  14. HomeAdvisor, Spray Foam Insulation Cost (Jun. 2026): homeadvisor.com
  15. HomeGuide, Spray Foam Insulation Cost (Dec. 2025): homeguide.com
  16. Fixr, Spray Foam Insulation Cost (Jan. 2025): fixr.com
  17. Today's Homeowner, Spray Foam Insulation Cost (Apr. 2025): todayshomeowner.com
  18. Bob Vila, How to Find and Hire the Best Insulation Contractor (Apr. 2022): bobvila.com
  19. ICC-ES, ESR-5252 (Oct. 2025): icc-es.org (PDF)
  20. City of Seattle, 2021 Seattle Energy Code, Residential Chapter 3: seattle.gov (PDF)
  21. Huntsman Building Solutions, BES-102 Design Note (Oct. 2022): PDF
  22. Huntsman Building Solutions, Closed-Cell Limited Lifetime Warranty (2021): PDF
  23. Gaco, 183M Closed Cell Foam product data sheet (rev. Nov. 2022): gaco.com (PDF)
  24. Accufoam, How to Identify and Prevent Off-Ratio Foam (May 2025): accufoam.com
  25. SprayFoam Magazine, How Thick Should Spray Foam Be Applied in Each Pass? (2008): sprayfoammagazine.com
  26. NIST, Long Term Emissions from Spray Polyurethane Foam Insulation (2014): nist.gov
  27. City of Little Falls, Foam Plastics R316 Informational Handout: cityoflittlefalls.com
  28. FieldCamp, Insulation Contractor License Requirements by State (Sep. 2026): fieldcamp.ai
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