Rigid foam panels deliver a high R-value in a thin profile, resist moisture, and give continuous coverage that cuts the heat leaking through your framing — the go-to for rim joists, foundation and crawl-space walls, and tight assemblies.
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What It Is
Foam board is rigid panel insulation — stiff sheets of plastic foam that you cut, fit, and seal into place rather than stuff into a cavity. Two things make it stand out: it packs one of the highest R-values per inch of any common insulation, so it does more in a thin profile, and it resists moisture, so it holds up in damp, below-grade, and exposed spots where fiber insulation would sag and fail.
Because the panels form a continuous layer, foam board also cuts thermal bridging — the heat that shortcuts straight through wood or metal framing. That's why it's the natural pick for rim joists, foundation and crawl-space walls, and roofs, and why it's often paired with cavity insulation rather than used alone. It costs more than a fiberglass batt, so it's about using it where those strengths actually pay off — which is what we help you decide.
Types of Foam Board
Rigid foam board comes in three generic types. They trade off R-value, moisture resistance, and cost differently — here's the honest comparison, and we'll match the right one to your job.
The white bead-board panel — the most economical of the three.
The dense colored board (often pink/blue) built for moisture.
The foil-faced board with the highest R of the three.
Is It Right for You?
Foam board is a premium material that shines in specific spots — the places its high R and moisture resistance beat a standard batt.
Rim & band joists
Foam board seals and insulates the rim joist far better than a loose batt that sags and leaves gaps in that leaky spot.
Foundation & crawl-space walls
Below grade, rigid foam handles the moisture and stays put where fiber insulation would soak through and lose value.
Thin space, high R needed
Where you can't add cavity depth, foam board's high R-value per inch squeezes more performance out of a shallow assembly.
Stop thermal bridging
A continuous layer of foam over the framing cuts the heat that shortcuts straight through studs and joists.
Damp or exposed areas
In moisture-prone spots, XPS and polyiso keep performing where batt or cellulose would sag, mat, and fail.
Cathedral ceilings & roofs
In vaulted assemblies with little cavity, rigid boards deliver continuous coverage that cavity insulation can't.
How We Work
Foam board only performs when the panels are cut tight, sealed continuous, and covered to code. Here's how we handle every install.
We inspect the space and your goals — R-value, moisture, thermal bridging — and confirm whether foam board is the right call or a cavity material would do.
We recommend EPS, XPS, or polyiso and the right thickness to hit your R-value and moisture target for the location.
If existing insulation is old, wet, or contaminated, we remove and haul it away so the foam board seats on a clean, sound surface.
We cut the panels to size, fit them tightly, and seal seams and edges so the layer stays continuous — plus a code-required cover where the foam is exposed to living space.
We confirm full, gap-free coverage and proper sealing, 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 to code, and stand behind our work.
Real Customers, Real Results
Rodent intrusion and the associated damage they cause is the worst! After reading reviews, I decided on Attic Pros because they have great reviews and because they specialize in the work I needed. I was not disappointed. Within a few days of reaching out, Tom came out and did the estimate. The work began only two business days later! The work was scheduled over two days but they did it all in one! The guys arrived on time and were cheerful, polite, and pleasant to deal with. Kevin showed me pictures and video periodically throughout the day so I could see the work, start to finish. He answered all of my questions and explained everything clearly and patiently. Before they left they made sure there was no trash or debris left behind. The crawl space now looks like it belongs under a brand new home, it’s that clean and tidy. I highly recommend Attic Pros for all of your insulation and rodent elimination needs. Update: I came back and edited this, removing a star. The work and workers were great. However, a few days after the job, Julian from their business office messaged me that they had not received payment and the invoice was past due, even though they were paid IN FULL THE DAY OF WORK. Proof of payment was provided and he messaged me that a receipt would be sent when the payment was deposited. Very disappointing and unprofessional of him to go after a customer for payment when the problem lies with their accounts receivable. 10/14/26 I am adding to my review because issues had been discovered over time. They had missed a place where rats were entering, even though they had been out twice to check traps and found some. This guy did a less than thorough cleaning but he did close off the previously missed access point. My rat intrusion problem has been ongoing. 11/6/26 Attic Pros followed through and sent out Raul, an excellent worker, who took care of everything and made it right. While it may have been problematic for a bit, they kept working until it was all made right. They have been kind and communicative, specifically Paula. I will be calling them again in the Spring to work on a different area of my home.
Samim very professional
Did crawl space cleanup and rodent proofing. They were very efficient and thorough.
Samim was great and work very hard. We appreciate him very much.
Attic Pros did a great job with sealing up holes and gaps and installing mesh I would recommend them I had a good experience with them
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.
QUESTIONS, ANSWERED
Straight answers to what people actually ask about foam board — the types, its R-value and moisture resistance, 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 — R-value, moisture, or thermal bridging — and we'll assess the space, recommend whether foam board is the right fit, and give you a clear, no-pressure estimate.
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