Fast, Reliable Spray Foam Insulation Across North Hills
Spray foam insulation in North Hills usually costs between $1.50 and $4.50 per board foot installed, and most retrofit jobs on the area’s 1950s – 60s ranch homes run $2,800 to $9,500 depending on scope. We work throughout the 91343 and 91393 ZIP codes, and we know exactly what your stucco-on-wood-frame house is hiding inside its walls: empty 2×4 cavities, air-leaking rim joists, and unpermitted patio enclosures that were never insulated to begin with. If you’re tired of rooms that spike past 90°F in July yet feel drafty in January, call us at (877) 265-5712 and we’ll get a crew out fast.
Why North Tustin Insulation Is North Hills’s Preferred Spray Foam Insulation Company
We’re an insulation-only contractor, which sounds like a small distinction until you think about it. No roofing side jobs. No HVAC pivots. Every tech on our crew spends every working day thinking about air sealing, R-values, and thermal bridging. That focus is why we carry both Icynene and Demilec spray foam systems, two of the industry’s better open- and closed-cell lines, and why homeowners in North Hills call us for the retrofit work that generalist crews turn down or guess at.
Our teams know the 91343 housing stock. We know single-story stucco ranches with unlined attics and untouched original walls. We know converted garages and enclosed patios that were never permitted, never insulated, and are now leaking heat into adjoining living space. We match the material to your home, not the other way around. Allen Decker, our owner, set the company up around a simple idea: carry the right insulation for the job, and be honest about when spray foam is not the answer. Sometimes blown-in cellulose is. We’ll tell you which, and why.
We’re state-licensed, insured & bonded, and we quote upfront before any truck rolls. Free estimates. No pressure. Call (877) 265-5712 and you’ll talk to someone who can explain open-cell versus closed-cell in plain English, not sales-script jargon.
Spray Foam Wall Insulation in North Hills
Spray Foam Wall Insulation in North Hills is, for most of this ZIP code, a retrofit into empty cavities rather than a new-build application. Homes built here in the 1950s and 1960s went up with uninsulated 2×4 stud walls behind stucco. There was no code requiring wall insulation then, and most of these houses still have literally nothing between the drywall and the exterior sheathing. We inject open-cell or closed-cell foam through small exterior penetrations in the stucco, filling the cavity from within. The stucco gets patched, the wall gains real R-value, and the air leaks get sealed in the same pass.
What Wall Foam Costs on a North Hills Ranch
Wall injection foam on a typical 1,200 to 1,800 square foot ranch in 91343 runs $4,800 to $8,900. The spread comes down to cavity thickness, stucco accessibility, and whether we’re doing one wall or the entire envelope. Closed-cell runs higher than open-cell because it delivers roughly R-6.5 per inch and acts as a vapor barrier, which matters when you’re sealing a shared wall against an unconditioned enclosed patio.
When Injection Foam Beats Gutting Walls
Gutting a 1960s stucco ranch to add batts costs three to five times what injection foam costs, and it turns a three-day retrofit into a six-week remodel. Injection foam treats the house as a sealed system, not a construction project. For the pre-1970s stock that dominates North Hills, this is usually the right call, especially on bedroom walls that bake against afternoon Valley sun.
Rim Joist Spray Foam in North Hills
Rim Joist Spray Foam in North Hills addresses the single worst air-leak point in most mid-century ranch homes: the band joist where the floor framing meets the foundation wall. In our experience across 91343, original rim joists in these houses were never sealed, caulked, or insulated. That gap lets 100°F attic and exterior air pour into the crawlspace or basement perimeter in summer, and cold air draft through in winter. We foam every bay with closed-cell Demilec or open-cell Icynene, depending on moisture exposure and access.
Signs Your Rim Joists Are Leaking in North Hills
If your floors feel cold along outside walls even when the thermostat reads 72°F, or you smell stale crawlspace air in ground-floor rooms, the rim joists are almost certainly open. Homes on Sepulveda-facing lots get extra air pressure against the west face. The fix is fast: one day, usually, and it costs between $1,800 and $3,400 for a typical 1,500-square-foot ranch.
Enclosed Patios and Converted Garages: The North Hills Problem
Because so many 1950s – 60s North Hills ranch homes have unpermitted patio enclosures and converted garages, our crews here routinely foam the shared wall and ceiling cavity between the house and that added-on space. This is a thermal-bridging retrofit that contractors in newer neighboring cities almost never get called for. The enclosure was typically furred out with bare 2x4s, thrown up with no cavity insulation, and now leaks hot Valley attic air directly into the conditioned house. We seal the rim and stud bays along the shared wall and close the enclosure ceiling, cutting the bridge at its source.
Trusted Brands We Service in North Hills
We carry Icynene and Demilec spray foam systems for open-cell and closed-cell applications, plus Owens Corning fiberglass, GreenFiber cellulose, and Rockwool mineral wool when a North Hills home would genuinely be better served by a different method. We are an authorized installer for Owens Corning and CertainTeed products. We stock common components locally, which means faster turnaround on North Hills retrofit jobs, not a two-week wait on a shipped-in special order. Eight brands, one contractor, matched to your house. That’s the whole model.
Common Spray Foam Insulation Problems We See in North Hills Homes
- Empty original wall cavities behind stucco. Most 1950s – 60s North Hills ranches in 91343 have zero insulation in the walls. Crews that assume there’s a thin batt layer to foam over leave voids. We verify first, then inject.
- Unpermitted patio enclosures with no rim sealing. We see these on nearly every block between Woodley Avenue and Sepulveda Basin. The added space was never framed with air-sealing in mind, so hot attic air bridges through the shared wall. Foam on that cavity is the fix.
- Converted garages that stay hot after DIY foam jobs. Foaming a garage ceiling without sealing the rim joists and the wall against the house is half a job. The radiated heat from the stucco and the unsealed band joist overwhelms the ceiling foam. We see this constantly in North Hills.
- Low-pitch attics with single-pane windows creating condensation risk. Closed-cell foam applied over an unvented roof deck on a pre-1970s low-pitch attic can trap moisture if the original single-pane aluminum windows are still in place. The room never dries out. We check the enclosure before recommending unvented foam.
Pricing for Spray Foam Insulation in North Hills, CA
Open-cell spray foam in North Hills typically runs $1.50 to $2.50 per board foot. Closed-cell runs $2.80 to $4.50. A single shared wall between a house and an enclosed patio usually lands between $2,800 and $4,600. A full rim joist seal on a 1,500-square-foot ranch falls between $1,800 and $3,400. A converted garage ceiling plus shared wall runs $4,200 to $7,800 depending on cavity depth and access. These are real ranges for this market, not national averages. We offer free estimates in 91343 and 91393, and we’ll tell you honestly if spray foam is the right material for your specific job, or if blown-in cellulose or mineral wool would perform better for less money. Call (877) 265-5712 and we’ll come look.
We Also Serve Cities Near North Hills
Beyond North Hills, our crews cover North Hills neighbors including Northridge, Van Nuys, Valley Glen, and San Fernando. If you’re in the northwest Valley and your house predates 1970, odds are good we’ve sprayed foam on your street. Call (877) 265-5712 and we’ll confirm coverage in your ZIP code.
Serving North Hills, CA — Our Local Coverage Area
We’re based in the North Hills 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 North Hills
Yes. That shared wall is one of the most common retrofit jobs we do in 91343 because the patio enclosure was almost never insulated when it was added. We inject open-cell or closed-cell foam into the existing cavities, seal the rim joist along that wall, and close the enclosure ceiling. We had a job like this off Plummer Street where a 1958 stucco ranch’s enclosed patio was bleeding heat into the living room wall all summer. After we sealed the shared wall and the rim bays with Icynene foam, the homeowner said the back rooms finally held temperature through a triple-digit Valley afternoon. Call (877) 265-5712 for an exact quote on your specific enclosure.
Probably not. Homes built in the 1950s and 1960s across 91343 were framed with 2×4 walls and no insulation requirement, and most have never been retrofitted. We verify with a borescope before we quote. If the cavities are empty, injection foam through the exterior stucco is usually the smartest route because it fills the void and air-seals in one step. Expect between $4,800 and $8,900 for whole-house wall injection on a typical ranch.
Because the rim joist and the shared wall against the house were probably never sealed. A converted garage in 91343 usually has stucco exterior walls absorbing direct Valley sun, an uninsulated band joist, and a wall against the house that was never insulated. Foaming the garage ceiling alone leaves two major heat bridges intact. We seal the rim bays and the shared wall, then the ceiling, and the space finally behaves. Call (877) 265-5712 for a free inspection of your garage.
It can, if closed-cell foam is applied over an unvented roof deck while the original single-pane aluminum windows are still in the rooms below. Those windows sweat, the sealed attic traps the moisture, and you get condensation inside the roof assembly. On low-pitch mid-century attics in North Hills we evaluate the enclosure first. If unvented foam is the right call, we’ll say so. If not, we’ll recommend vented insulation like blown-in cellulose under the deck. That distinction matters, and it’s exactly the kind of misdiagnosis we get called in to correct.
We install Icynene open-cell and Demilec closed-cell spray foam, plus we stock Owens Corning fiberglass and GreenFiber cellulose on our trucks. For most North Hills retrofit work, open-cell Icynene on shared walls and closed-cell Demilec on rim joists and rooflines is the pairing we reach for. The material depends on the cavity, the exposure, and the goal for that specific wall. Call (877) 265-5712 and we’ll tell you exactly what your house needs and what it costs before you commit to anything.
Written by Allen Decker, Owner at North Tustin Insulation, serving North Hills with spray foam, attic, and blown-in insulation.