Hot upstairs rooms, a drafty attic or ducts baking under the roof? Closed-cell foam seals and insulates the roof deck in one layer.
Closed-cell foam insulation is a dense, rigid foam we spray onto the underside of a roof deck, into walls or around a crawl space. For Rohnert Park homes, it's the right pick when you want one layer that slows heat, seals air leaks and keeps moisture out.
Each inch is rated about R-6, and R-value is just how well insulation slows heat, so closed-cell does a lot of work in a shallow rafter bay. At the usual thickness it also acts as a vapor retarder, a layer moisture vapor can't get through, and it won't soak up water. That's why I reach for it when the ductwork lives up in the attic.
The price mostly comes down to how many square feet we're covering, how thick the foam goes, whether the roof needs repairs first and whether the product needs a covering over it. The schedule depends on the roof too, and on how long you'll need to stay somewhere else while the foam goes on. You'll get your own numbers at the estimate, once I've been up in the attic.
When you spray the underside of the roof, the attic becomes part of the house. That brings a few things to plan for, and the foam you choose settles some of them.
Some spray foams need a thermal or ignition barrier over them. That's a protective layer such as a special coating or drywall, and the product or the code decides when it's needed. Not every foam calls for one, so the product we choose decides whether this step is part of your job. We check it before we price anything.
Foam under the roof can close off the attic and make it a conditioned space, which means it sits inside the part of the house you heat and cool. A sealed attic like that needs a way to get rid of moisture. So we work out how yours will dry before anything gets sprayed, not after.
During a wildfire, ash and embers get into a vented attic through its vents. A sealed, unvented attic doesn't have those openings, and it's significantly more fire safe in wildfire areas. If fire season is on your mind, that's worth weighing alongside comfort and cost.
Here's how a foam job goes from your first call to the walkthrough, and who you'll be dealing with at each step along the way.
Give us a call or fill out the form, and we'll get back to you to set up a time. Tell us which area you want insulated and anything you know about the roof.
I come out, go up into the attic or down into the crawl space and take photos. Then I sit down with you to show you what I found and what I'd do first.
On the day of the work, our crew protects your floors, handles the prep and sprays the foam, with me or one of our lead installers running the day. By then you've made plans to be out of the house.
Once the spraying is done and the house has had time to air out, I walk through the finished job with you before we pack up, and we go over coming back inside.
Closed-cell foam often goes right under the roof deck, the plywood your shingles are nailed to. So before I price anything, I check how old the roof is and whether it's ever leaked. Foam sprayed over a wet or damaged deck just hides the problem, so any leaks and damage get fixed first. If the roof is close to needing replacement, I'll tell you, and we'll help you plan the two jobs together.
Closed-cell isn't the only foam we spray. We also install open-cell foam insulation where a softer foam suits the space better, and we handle commercial insulation for business buildings too. For most houses, though, the real question is whether foam belongs up there at all. These are the two options I walk most people through.
This seals air and insulates in one pass, and it brings the attic inside the house, which is what you want when the ductwork runs up there. It costs more, and the roof's condition comes first.
We seal the gaps around can lights, pipes and the hatch, then top up with blown-in insulation, which is loose fill blown through a hose. If your ducts aren't in the attic, this usually wins, and it's what I'd pick.
Send the form and we'll get back to you within one business day to set up a visit. The estimate is free, done in person at your home, and there's no obligation. It helps to note the area you want insulated, how old the roof is and whether it's ever leaked.
(707) 576-6028The City of Rohnert Park requires a building permit for any new construction, addition, alteration, repair or demolition. The city's list names reroofs, fireplaces, pools and carports, but it doesn't mention insulation, so it isn't clear whether foam on its own needs a permit. Before work starts, we check with the city's building office. If a permit is needed, we apply for it, keep you posted and set up the inspections.
In Rohnert Park, a building permit can only be issued to a licensed California contractor or the legal property owner. If your plans include a reroof, that's on the city's list, which is one more reason to line up the roof and the foam together.
Most of our calls here start with an upstairs that won't cool down, a hot room over the garage or a power bill that climbs every summer. We're based in Rohnert Park and do the same work across Sonoma and Marin counties, including Santa Rosa and Petaluma.
I come out for every estimate myself, and I go up into the attic before I say a word about foam. I started as a helper on a small insulation crew, hauling bags and crawling through attics. The lead I worked under taught me to look at the whole house before selling anybody anything, and I've run this business that way since 2021.
Our crew does the work, with me on site or one of our lead installers running the day. We're licensed and insured, and we back the work with two words, satisfaction guaranteed. If you're weighing foam for your roof, call (707) 576-6028 or send us a message, and I'll come take a look.
If your rafter bays need filling but moisture isn't the main worry, open-cell foam is a softer spray option worth comparing before you decide.
Own a commercial building near Rohnert Park? We insulate those too, and we start by looking at the roof and the whole building first.
We're based in Rohnert Park and spray closed-cell foam across Sonoma and Marin counties. The cities below have their own pages, and we work in plenty of others nearby, so ask if yours isn't listed.
In 2022, closed-cell spray foam usually ran about $1.20 to $1.80 per board foot in San Francisco. A board foot is one square foot of foam, one inch thick. That's the area's going rate, not our price. Your cost depends on the square footage, the thickness, any roof repairs and whether a covering is needed.
Plan to be out of the house while the foam is sprayed and for at least 24 hours afterward. Emissions vary with the foam type and the conditions in your house. We'll go over the safety steps with you ahead of time so you can line up somewhere to stay with the kids and pets.
Closed-cell is the one to choose if you want a single layer that handles both heat and moisture under the roof. Under a roof deck, it works as the insulation and the vapor control at once, while open-cell lets moisture vapor pass right through. At the estimate, I'll show you which one fits your attic.
It's worth checking before you commit. People with skin conditions, respiratory allergies or asthma should read the product information carefully, and if there's still a concern, consider a different kind of insulation. Mention it at the estimate, and I'll get you the information for the foam we'd use.
Ask every spray foam contractor for proof of insurance and licenses. In California, the C-2 Insulation and Acoustical classification covers contractors who install insulation for temperature or sound control, so that's the license to look for on an insulation job. Feel free to ask us for ours too.
We take calls at (707) 576-6028 seven days a week until 10 at night, so you can call after work and set up a time.
