Fast, Reliable Spray Foam Insulation Across North Hollywood
Spray foam insulation in North Hollywood costs between $2.50 and $7.00 per board foot installed, with most whole-attic jobs landing in the $3,500 – $8,000 range depending on depth and whether you choose open-cell or closed-cell. We get crews to North Hollywood homes in 1 – 2 business days for estimates and can usually start within the week. This page is written for homeowners in the 91601, 91605, 91615, and 91616 ZIP codes who are tired of rooms that feel like ovens by 3 p.m. Call Ruben and the team at (833) 390-7079 for a free on-site assessment.
Why Airtight Insulation Co Is North Hollywood’s Preferred Spray Foam Insulation Company
We’re not a one-product shop. Airtight Insulation Co carries eight manufacturer brands—including Reflectix service in North Hollywood—and installs open-cell and closed-cell spray foam, blown-in cellulose, fiberglass, and mineral wool. That matters in North Hollywood because the housing stock is all over the map: a 1940s bungalow off Burbank Boulevard needs a completely different approach than a dingbat apartment on Magnolia. Our crews know both. Ruben Acosta has spent years working the San Fernando Valley’s older housing stock, and the crew understands knob-and-tube wiring, plaster-over-lath, and shallow attic spaces that make newer construction guys freeze.
We service North Hollywood with dedicated teams familiar with the NoHo Arts District, Valley Village-adjacent blocks, and the residential streets east of the 170. Reviews from North Hollywood homeowners consistently mention two things: our reps showed up on time, and the work was sealed properly, not just sprayed and left. We aim for all jobs to pass a smoke-pencil test at edges and penetrations. That’s the standard, not an upsell.
Rim Joist Spray Foam in North Hollywood
Rim joist spray foam in North Hollywood is one of the most cost-effective upgrades we do, especially in homes where the band joist was never sealed. The rim joist is the perimeter framing where the floor deck meets your foundation wall, and in 1920s – 1950s construction it’s typically a thin strip of lumber with no insulation behind it. We install closed-cell foam at 2 – 3 inches to seal the thermal boundary and block the air that leaches in around the sill plate. Typical North Hollywood rim joist jobs run $1,200 – $3,000 for a standard footprint home, with dingbat and courtyard buildings priced per unit.
Where the air actually leaks
In older North Hollywood homes, the biggest rim joist gaps are often hidden behind original stucco lips or under porch framing. Our techs look at the full perimeter before quoting because air movement near the soil line pulls in dust, exhaust, and moisture, not just heat.
Why closed-cell makes sense here
North Hollywood’s heavy clay soil shifts seasonally. Closed-cell foam adds some rigidity to the rim framing and won’t slump when the gap opens up slightly during summer dry spells. That’s the functional advantage over fiberglass batts shoved into the same space.
Crawl Space Spray Foam Insulation in North Hollywood
Crawl space spray foam insulation in North Hollywood addresses a problem most first-time buyers don’t notice until the first hot week: heat and humidity migrating up through the floor deck from an unvented or poorly vented crawl space. In the postwar bungalows and small courtyard buildings common throughout 91601 and 91605, we typically install closed-cell foam at the underside of the floor deck or spray the perimeter walls to encapsulate the crawl space. Costs in North Hollywood generally range from $2,800 – $7,500 depending on square footage and access, with tight crawl spaces adding labor if only a 22-inch space is available.
Encapsulation vs. floor deck only
For North Hollywood homes with ductwork running through the crawl space, spraying the perimeter walls and sealing the vents makes more sense. You’re keeping the ducts inside the conditioned envelope instead of letting 100°F crawl space air heat the air your AC just cooled.
Moisture first, foam second
We won’t spray foam over a wet crawl space. If there’s standing water, efflorescence, or visible rot, we’ll tell you. No foam job in North Hollywood should start until the moisture source is handled. That’s a hard rule, not a suggestion.
Trusted Brands We Service in North Hollywood
We install spray foam from Demilec (both open-cell and closed-cell lines) and Icynene for jobs that need high expansion and air-sealing performance. When spray foam isn’t the right call, we can pivot to GreenFiber blown-in cellulose or Owens Corning and Johns Manville fiberglass. That flexibility means you don’t get talked into foam when your home actually needs something else. For North Hollywood customers, we stock the most common Demilec and Icynene kits locally in Las Flores, which keeps turnaround on change orders and touch-ups days shorter than ordering from a regional distributor.
Common Spray Foam Insulation Problems We See in North Hollywood Homes
- Foam sprayed over knob-and-tube wiring. Many 1920s – 1940s North Hollywood bungalows still have active knob-and-tube circuits. Spray foam applied directly over live wiring traps heat and creates a fire risk. The wiring must be assessed and isolated before any foam goes in.
- Exterior stucco injections with uncontrolled pressure. Crews used to open-cell foam in drywall cavities sometimes blow out plaster or crack the stucco on older courtyard buildings. North Hollywood’s 1920s – 1950s stucco is brittle, and the injection method has to match that reality.
- Attic spray foam without rebalancing ventilation. Many North Hollywood attics are shallow and were built for passive venting. Sealing the roof deck with foam traps heat if you don’t reconfigure ventilation and, in some cases, the HVAC design.
- Mismatched foam type for the application. Open-cell foam in a crawl space that sees groundwater vapor will hold moisture. Closed-cell on a roof deck in a home that was never designed for a sealed attic can create condensation. The product has to match the job.
Pricing for Spray Foam Insulation in North Hollywood, CA
Here’s what North Hollywood homeowners should expect to pay for spray foam work as of 2026. Open-cell attic spray foam runs $2.50 – $4.50 per board foot installed. Closed-cell runs $3.50 – $7.00 per board foot. Rim joist jobs on a standard 1,200 – 1,600 square foot bungalow typically come in between $1,200 and $3,000. Crawl space encapsulation work ranges from $2,800 to $7,500. Exterior stucco injection on plaster-over-lath walls is priced per square foot of wall area and runs $6 – $12 per square foot depending on access, stucco condition, and patching requirements. Every estimate includes material costs, labor, and a written scope. Call (833) 390-7079 for a free estimate with exact numbers for your specific floor plan and wall assembly.
We Also Serve Cities Near North Hollywood
Our crews work throughout the San Fernando Valley, including Spray Foam Insulation in North Hollywood and the surrounding communities of Studio City, Universal City, Burbank, and Valley Glen. If you’re just across the line on Cahuenga or Riverside Drive, the team that handles North Hollywood work can typically schedule you without a separate dispatch. If you’re in the broader LA area, our Spray Foam Insulation team covers the whole region.
Serving North Hollywood, CA — Our Local Coverage Area
We’re based in the North Hollywood 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 Hollywood
Yes, in most cases. If your bungalow has plaster over wood lath with no wall cavity, the standard method is exterior injection: we drill through the original stucco, inject open-cell or closed-cell foam into the stud bays, then patch and texture the stucco to match. This preserves your original interior walls and avoids demolition. The technique is specific to the older construction patterns you find all over 91601 and the blocks around Chandler Boulevard. Call (833) 390-7079 to have us evaluate whether your wall system qualifies.
The rim joist is a common air leak point. In North Hollywood, outdoor air in summer is often 95 – 105°F, and every gap around your sill plate lets that air into the floor system and wall assembly. Sealing the rim joist with closed-cell foam blocks that infiltration and also keeps humid crawl space air from condensing against the subfloor. It’s one of the fastest ways to make a bungalow feel less hot in the late afternoon. Our Spray Foam Insulation team installs rim joist foam on most North Hollywood retrofit jobs.
Dingbat crawl spaces are often shallow, poorly vented, and made worse by irrigation runoff and Valley heat. Before foam goes in, the space needs a moisture inspection. If groundwater vapor is pushing up through the soil, we address that first. Then closed-cell foam on the perimeter walls or floor deck gives you thermal separation and blocks moisture-driven air movement. Expect a crawl space job under a dingbat building to cost $2,800 – $7,500 depending on access and whether we encapsulate the full perimeter.
Absolutely. Knob-and-tube wiring is still present in many North Hollywood homes built before 1940, and spray foam cannot be applied over live K&T circuits. The wiring runs hot in summer, and encasing it in foam prevents heat dissipation and creates a fire hazard. Any reputable contractor will require a wiring assessment and either circuit replacement or rerouting before the foam goes in. We don’t spray first and ask questions later. That’s a line we won’t cross, and it’s the main reason we look at the electrical panel on every pre-1950 North Hollywood estimate.
We install Demilec and Icynene spray foam, both open-cell and closed-cell. For North Hollywood’s older bungalow and dingbat stock, closed-cell Demilec is often the right product for rim joists and crawl spaces because it adds structural rigidity and is less vapor-permeable. Open-cell Icynene works well for attic roofline applications where you want a more vapor-open assembly. The brand choice comes from the application, not the warehouse inventory. Call (833) 390-7079 and we’ll tell you which product matches your specific wall, joist, and attic configuration.
Need a straight answer on your North Hollywood insulation situation? Call Ruben and the Airtight Insulation Co team at (833) 390-7079. We’ll walk the house, tell you what’s actually wrong, and quote you a number you can hold us to. Free estimates, no product pushing, and no foam over wiring that shouldn’t have foam on it.
Written by Ruben Acosta, Owner at Airtight Insulation Co, serving North Hollywood and the San Fernando Valley.