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
Tom is very professional. He explained the details of attic cleaning they do, showed the photos and what all cleaning service needed, and followed up with itemised quote. Very quick in responding to queries over the phone and text.
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.
Tom was professional, knowledgeable and efficient. I got the quote fast and I look forward to Attic Pros doing the work.
We had Samim come out to our house. He was so kind, fair, and professional, and put me at ease following an exorbitant price gouging experience. I highly recommend Attic Pros and if you can, ask for Samim. You will be happy with the quality of their work as well.
Tom was a great help Thanks again tom for make sure this all goes smoothly G
Attic Pros recently replaced my old insulation with new insulation. I called them back today 3 weeks later to check on the Rat traps they placed in the Attic as I experienced an unusual odor coming from the air vents throughout the house. Jose of Attic Pros responded and was a very upbeat chearful person who explained what he was going to do prior to going into the Attic to check on the Rat Traps. Fortunately the traps were still set with no activity. Jose took photos ( see attached) while he was in the Attic which showed no activity. I later found that the odor was a filter in the hvac systrem which had debris which causec the odor. Jose completed the inspection by walking around the house and inspecting the outside vents which I appreciated. All the Attic Pro employees which I have come into contact with are Professional, friend;y an do a thouough job completing whatever jobs in their field are requested.
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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