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 a professional and did a very detailed inspection, also gave additional details to prevent in future infestation.
My wife and I found mice droppings in our kitchen cabinet. We reached out to Attic Pros and was connected with Tom. He was very professional and thorough with his inspection. We went through our crawl space and attic. Gave us a full rundown of issues/problems we may be experiencing now and potentially in the future. Thanks for your expertise and quick follow up with the quote and service Tom.
These guys are awesome. Super clear comms to schedule, then received an extremely thorough consultation. We eventually decided to go with them as other shops in the area didn't communicate as well as Attic Pros.
Tom from Attic Pros was great to work with! He was friendly, professional, and thorough during the inspection. He clearly explained everything he found and answered all of my questions. The whole process was straightforward. Thank you, Tom!
Finding out we had a rodent infestation for the first time was incredibly stressful, but Attic Pros made the entire process so much easier! Jeremy was very knowledgeable when help preparing the estimate and the work that needed to be done. Their team that came to perform the work—Nico Otten, Juan Rodriguez, and Antonio Lopez—were amazing from start to finish. Communication was fantastic right from the beginning. The crew was super fast, highly efficient, and left everything very clean after sanitizing our attic, crawl space, and garage. They definitely gave us total peace of mind. They were also able to finish in one day!!
Our small cottage has a very narrow attic entrance. Denis from Attic Pros was willing to try and was able to enter to clean, vacuum, and replace the old insulation. Very professional, access areas were well shielded and protected. Powerful vacuum and clean up well after themselves.
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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