Fast, Reliable Spray Foam Insulation Across San Bernardino
Spray foam insulation in San Bernardino is built around one hard fact: your attic hits 150°F in July, and most pre-1980 homes here still have the original R-11 or R-19 fiberglass that settled decades ago. We fix that. Our crews service homes from Baseline Street to the 215 corridor, and we know the older stock in 92404, 92405, and 92410 better than any out-of-town outfit. If you’re tired of rooms that never cool down and AC bills that climb every summer, call us at (855) 382-3451. We’ll tell you whether open-cell or closed-cell foam actually makes sense for your house, not just whichever one we happen to prefer.
Why Thermal Insulation Co Is San Bernardino’s Preferred Spray Foam Insulation Company
Thermal Insulation Co isn’t a general contractor who picked up a foam rig last season. Insulation is the entire trade. Ruben Castellano and our team install spray foam systems from Icynene and Demilec, and we carry fiberglass, mineral wool, and cellulose from six other manufacturers, which means our recommendation for your San Bernardino home is driven by what your attic actually needs, not what we have left in the truck. That matters in a city where half the attics we open contain compressed rock wool from the Eisenhower administration.
We’ve worked on mid-century tract homes off Baseline, post-war stucco houses near the 215, and garage conversions in 92404 that were never properly sealed from the living envelope. San Bernardino homeowners call us because we identify the problem correctly before spraying anything. That includes testing pre-1970s attic fill for asbestos when the job calls for it. A contractor who skips that step is gambling with your family’s lungs. We don’t.
Our response time to San Bernardino is typically same-day for estimates and within a few days for scheduled work. Ruben walks every job personally when it involves older homes, because a 1962 attic in San Bernardino is not the same animal as a 2015 attic in Rancho Cucamonga.
Closed Cell Spray Foam Insulation in San Bernardino
Closed Cell Spray Foam Insulation is the workhorse for San Bernardino’s climate when you need air sealing, moisture resistance, and structural rigidity in one application. It cures into a dense, rigid foam with an R-value around R-6.5 to R-7 per inch, and it acts as a vapor barrier, which matters in a semi-arid climate where Santa Ana winds push fine dust and dry heat into every unsealed crack. For a typical San Bernardino roof deck or rim joist application, expect $2.00 to $3.50 per board foot installed, with attic jobs in older homes running $4,500 to $9,000 depending on square footage and prep work.
Roof Deck Application
In an unvented attic, we flash closed cell directly against the roofline to bring the entire attic inside the conditioned envelope. On a San Bernardino afternoon when the roof surface reads 150°F, that two-to-three-inch foam layer keeps the attic from becoming an oven that radiates heat into your ceiling all night. It also cuts the dust that Santa Ana winds force through ridge vents and gable openings into open insulation.
Garage Conversion Sealing
This is a San Bernardino specialty. The city has thousands of garage-to-living-space conversions, especially in 92404 and 92405. The shared wall between the former garage and the conditioned house is often nothing but bare studs and drywall. We spray closed cell into that wall cavity and the rim joist to stop 100°F+ garage heat from bleeding into the cooled envelope. Skip this step and your attic foam is doing half its job.
Open Cell Spray Foam in San Bernardino
Open Cell Spray Foam makes sense in San Bernardino when you want maximum air sealing at a lower material cost, and you’re working in a ventilated attic rather than against a roof deck. It expands to fill every stud bay and rafter cavity, cures soft and spongy, and delivers about R-3.6 to R-3.8 per inch. For a standard 1,200-square-foot attic floor in a San Bernardino ranch house, expect $3,500 to $6,800 installed. It’s not a vapor barrier, so it pairs well with San Bernardino’s dry climate where trapped moisture is less of a concern than in coastal zones.
Attic Floor Air Sealing
When we open a San Bernardino attic with original R-11 fiberglass, the problem isn’t just the R-value. It’s the gaps around top plates, electrical penetrations, and the attic hatch. Open cell sprayed directly onto the attic floor seals those leaks while insulating. The result is a house that stops pulling 150°F attic air down through the walls every time the AC kicks on.
Dust and Noise Control
San Bernardino’s dry, dusty air settles into everything open. Open cell’s continuous, crevice-filling surface resists that dust intrusion far better than blown fiberglass or batts. It also damps noise, which matters if you live near the 215 or a busy arterial like Baseline Street and want some relief from traffic hum bleeding through the ceiling.
Trusted Brands We Service in San Bernardino
We install Icynene and Demilec spray foam systems, both open-cell and closed-cell, because those two product lines cover the performance range San Bernardino homes actually need. Icynene’s open-cell is excellent for attic-floor air sealing on a budget, while Demilec’s closed-cell handles roof decks and garage conversion walls where moisture resistance and rigidity matter. We also carry Owens Corning and Johns Manville fiberglass for hybrid jobs where foam is used for the seal and a blown-in blanket handles the R-value. Because we stock multiple brands across the shop, we don’t have to push one product line on a house it doesn’t fit. For San Bernardino customers, that means parts and material are on hand, and jobs don’t get delayed waiting on a distributor shipment from Ontario.
Common Spray Foam Insulation Problems We See in San Bernardino Homes
- Pre-1970s attic fill disturbed without asbestos testing. Original vermiculite, rock wool, or cellulose in homes from the 1940s through 1960s can contain asbestos. Foaming over it or scooping it out without sampling first risks contaminating the entire house. On San Bernardino jobs in older ZIP codes, we test before we touch anything.
- Garage conversions left unsealed at the shared wall. A 1958 house with a converted garage off Baseline Street looks fine from the living room, but the shared wall leaks heat all summer. Closed cell on that wall and the rim joist is the fix. Foam on the attic alone won’t correct it.
- Santa Ana wind dust degrading open-cell foam. Fine desert dust driven by Santa Ana events settles into the exposed surface of open-cell foam and around unsealed penetrations. Over several seasons, that reduces the air seal. We recommend dust-resistant sealing around all penetrations and periodic inspection in wind-exposed neighborhoods.
- Compressed legacy insulation with rodent contamination. We routinely open San Bernardino attics to find rock wool compressed to less than half its installed depth, laced with droppings. Foaming over it seals the contamination in place. The right sequence is testing, removal, rodent-proofing, then foam or blown-in.
Pricing for Spray Foam Insulation in San Bernardino, CA
Closed cell spray foam in San Bernardino runs $2.00 to $3.50 per board foot installed. Open cell runs $1.50 to $2.50 per board foot. A full attic floor on a 1,200-square-foot mid-century ranch typically lands between $3,500 and $6,800 for open cell. Roof deck applications with closed cell run higher, usually $4,500 to $9,000, because prep and safety on San Bernardino’s older framing takes longer. Rim joist jobs in crawl spaces run $1,800 to $3,200. What moves the final number: whether we’re testing and removing legacy attic fill first, whether the framing is accessible, and whether a garage conversion needs sealing. Call (855) 382-3451 for a free estimate. Ruben walks the job, tells you exactly which foam fits, and prices it upfront. No pressure, no mystery line items.
We Also Serve Cities Near San Bernardino
Our spray foam crews cover San Bernardino plus the surrounding Inland Empire communities of Muscoy, Highland, Loma Linda, and Rialto. If you’re in one of those cities and dealing with the same extreme attic heat and aging housing stock, our Spray Foam Insulation team will come out and give you the same straight answer. For more about how we work throughout this region, see Spray Foam Insulation in San Bernardino and the neighborhoods we serve.
Serving San Bernardino, CA — Our Local Coverage Area
We’re based in the San Bernardino area and know this community well. Use the map below to see our service coverage — if you’re nearby, we can almost certainly help.
FAQs About Spray Foam Insulation in San Bernardino
Yes, if the home was built before 1970 and the original attic fill is still there, it needs to be sampled before we disturb it. Many San Bernardino attics from the 1950s and 60s contain vermiculite or other fill that can carry asbestos. Testing is inexpensive and takes a few days. Call (855) 382-3451 and we’ll coordinate the sampling before the foam job is scheduled, so there’s no stop-work surprise.
Closed cell is usually the right call on the shared garage wall and rim joist, because those surfaces need moisture resistance and air sealing under extreme heat. Open cell often works for the attic floor above the living spaces, where you want sealing but don’t need a vapor barrier. A typical 1950s San Bernardino house with a converted garage benefits from a hybrid: closed cell on the wall and roof deck, open cell or blown-in on the flat ceiling. Every house is different, and we’ll tell you which combination fits yours. Call for a walk-through.
It keeps that heat out of your living space. Closed cell flashed against the roof deck turns the attic into a conditioned zone, so the 150°F air never builds up in the first place. Open cell on the attic floor seals the ceiling plane and stops radiant heat from bleeding down through the drywall. Either way, your AC works less, and rooms stay closer to the thermostat setting on summer afternoons.
It will if the crew sprays over it without removing it, which is why we don’t do that. On San Bernardino jobs where we find compressed rock wool or cellulose contaminated with droppings, we remove and dispose of the old fill, rodent-proof the penetrations, and then apply foam. Sealing contamination under foam makes it worse, not better. We handle removal as part of the job when needed.
Only after we remove the settled material or verify it’s clean and safe to build over. Original R-11 or R-19 fiberglass from the 1960s has lost most of its effective R-value due to compression and dust, but it also hides gaps and sometimes contamination. We remove it, air-seal the ceiling plane, and then apply open-cell foam or a high-R blown-in blanket. Call (855) 382-3451 for a free estimate, and we’ll tell you exactly what your attic needs.
Written by Ruben Castellano, Owner at Thermal Insulation Co, serving San Bernardino and the Inland Empire with spray foam, blown-in, and attic insulation since our founding.
Ready to fix your San Bernardino attic? Call us at (855) 382-3451 for a free, no-pressure estimate. We’ll look at the attic, explain your options in plain English, and give you a price that holds.