Spray foam does two jobs at once — it expands to fill every gap and air-seals as it insulates, something batts and blown-in can't. The premium pick for air-sealing, tricky spaces, and a high R-value in a thin profile.
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What It Is
Spray foam is a liquid that expands on contact, flowing into gaps, cracks, and irregular cavities and then hardening in place. That expansion is what sets it apart: most insulation only slows heat, but spray foam also air-seals as it insulates — closing the leaks that let conditioned air escape and drafts get in. Doing both jobs in one step is why it's the premium choice where air-sealing and coverage matter most.
It comes in two forms — open-cell and closed-cell — with different strengths, and it delivers a high R-value per inch, especially closed-cell. It costs more than a fiberglass batt or cellulose, and it has to be professionally installed, so it's about using it where its air-sealing and reach genuinely pay off — which is exactly what we help you decide.
Two Types
Spray foam comes in two forms that trade off R-value, moisture behavior, and cost. Here's the honest comparison — and we'll match the right one to your space.
Lighter, softer foam that expands a lot — the more economical spray foam.
Dense, rigid foam — the higher-performance (and pricier) option.
Is It Right for You?
Spray foam is a premium material that shines where air-sealing and reach matter most — the spots a standard batt can't handle well.
Air leaks & drafts
If your home is drafty or hard to keep comfortable, spray foam's air-sealing closes the leaks that other insulation leaves open.
Irregular or tight cavities
In odd-shaped or obstructed spaces where batts leave gaps, spray foam expands to fill every void completely.
Rim joists & hard-to-reach spots
Rim joists, tight attic corners, and awkward framing are classic spray-foam jobs — it seals and insulates where access is poor.
High R in a thin space
Where you can't add much depth, closed-cell's high R-value per inch packs more performance into a shallow cavity.
Damp or exposed areas
Closed-cell resists moisture and acts as a vapor barrier, so it holds up in crawl spaces and other damp-prone spots.
Cathedral ceilings & unvented attics
For vaulted assemblies or sealing an attic at the roofline, spray foam does the air-sealing and insulating together.
How We Work
Spray foam is a professionally applied product that has to be mixed, sprayed, and cured correctly. Here's how we handle every install.
We inspect the space and your goals — air-sealing, moisture, R-value — and confirm whether spray foam is the right call or a cavity material would do.
We recommend open-cell or closed-cell and the right thickness to hit your air-sealing, moisture, and R-value targets.
We mask and protect the surrounding area, and cover anything that shouldn't be sprayed, so the application is clean and controlled.
We apply the foam evenly so it expands and seals, then let it cure properly — the space is kept clear until it's safe.
We trim any excess, confirm full, even coverage and a proper seal, clean up completely, and walk you through the finished job.
Why Attic Pros
For over 13 years, Bay Area homeowners and businesses have trusted us for insulation — because we recommend the right material for the job (not just the priciest), install it properly, and stand behind our work.
Real Customers, Real Results
UPDATE: I really appreciate the company followed up after my concerns were raised. They took accountability for what happened, handled the situation professionally, and offered to fix all the issues. Their responsiveness and willingness to make things right completely changed my impression, and I’m happy to update my review to 4 stars. They ultimately completed the job, but the overall experience was far from hassle-free. During the process, they damaged our ceiling and later repaired it, though the result was not fully satisfactory. There were multiple mistakes along the way, both in the actual work and in billing, which meant we had to stay very involved to ensure nothing was missed. Communication was also a challenge. Our consultant, Tom, was not as responsive as expected, especially given how busy schedules can be in the Bay Area. We often had to follow up multiple times to get updates or have issues addressed. Overall, while the job was eventually finished, the process required more oversight and effort than it should have. If I were to go through this again, I would choose a different company.
We recently had our attic and under our house taken care of and Attic Pros did a great job. Shout out to Amilcar and Walter. Thank You.
Shah turned my experience around from a bad one to a good one in the very beginning. Aleksandra at the office answered and addressed all my questions and concerns very thoroughly. Jose who did the rodent proofing, answered all my questions and took his time going through the crawlspace and making sure he found and covered all potential access points for rodents into the crawlspace. He was very patient and thorough.
Just had a great inspection from Tom. Very informative and helpful!
Dennis is extremely professional, communicated all that was happening, explained where the critters were invading and did a very thorough job sealing the house, along with his helper. Thank you!
Denis, German,& Alexander were great. Very professional, thorough and customer oriented. I would recommend them for any attic, crawl space, HVAC, insulation, rodent & sub pump work. They were nice, hard working & non intrusive.
QUESTIONS, ANSWERED
Straight answers to what people actually ask about spray foam — the two types, air-sealing, safety, and how it compares. Still weighing your options? Our team is happy to help.
Talk to our team — we're here to help.
(800) 543-0382Explore More
Ready when you are
Tell us about your project — air leaks, a tricky space, or moisture — and we'll assess it, recommend whether spray foam (and which type) is the right fit, and give you a clear, no-pressure estimate.
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