Fast, Reliable Spray Foam Insulation Across Hollywood
Spray foam insulation in Hollywood typically runs $2.50 to $6.00 per board foot installed, with a full 1,200-square-foot bungalow wall retrofit landing between $4,500 and $9,000. Our Spray Foam Insulation crews work throughout the 90028 zip code and the hillside streets above Franklin Avenue, and we can usually be on-site within 24 to 48 hours of your call. If you’re dealing with rooms that won’t hold temperature, noise bleeding through shared walls, or condensation on old plaster, call us at (855) 341-7856 for a free estimate.
Why Comfort Zone Insulation Co Is Hollywood’s Preferred Spray Foam Insulation Company
We install insulation and nothing else. That focus is why Hollywood homeowners call us when a general contractor’s spray foam job leaves gaps, or when a 90-year-old bungalow needs a retrofit that most crews won’t touch because it’s not a clean stud-bay install. We’ve worked in the hills above Cahuenga Pass, in courtyard apartments off Fountain Avenue, and in the bungalow courts north of Santa Monica Boulevard. Those jobs taught us something real: Hollywood’s housing stock doesn’t respond well to generic insulation playbooks.
Noel Carrasco, who leads our crew, has spent years diagnosing the exact problem this city throws at you: original lath-and-plaster walls with furring cavities instead of modern studs, vented attics pulling June Gloom moisture, and west-facing walls that absorb afternoon sun plus a steady bassline from the Strip. We carry eight manufacturer lines, from Icynene and Demilec closed-cell foams to Rockwool mineral wool for fire-rated party walls. That means the product we recommend for your Hollywood home is the one that fits your wall, your noise problem, and your heat load, not whatever we ordered this week.
Spray Foam Wall Insulation in Hollywood
Spray foam wall insulation in Hollywood homes usually means working on 1920s and 1930s wood frame construction, where the wall cavity behind the original lath-and-plaster is often a furring space barely an inch deep. That changes the entire approach. Foaming into that thin cavity correctly usually requires opening the wall from the exterior sheathing side after pulling the original siding, rather than drilling and injecting blind, because a blind injection into a furring cavity misses voids and can crack the plaster from hydraulic expansion. For a typical 1,200-square-foot bungalow, expect $4,500 to $9,000 depending on whether you choose open-cell or closed-cell foam and how much accessory air sealing the job requires.
Closed-cell for west and south walls
West- and south-facing walls in Hollywood take the worst of the afternoon heat, especially in the hillside neighborhoods above Hollywood Blvd. We typically spec closed-cell Demilec or Icynene at two to three inches on those elevations. That gives you an air seal, a vapor retarder, and enough thermal break to stop the plaster from radiating heat back into the room at 7 p.m.
Open-cell for interior and party walls
For interior walls and shared walls in courtyard apartment buildings, open-cell foam does the acoustic work at a lower material cost. It won’t stop moisture the way closed-cell does, but in a dry interior cavity that’s not the job. The sound attenuation matters more when your wall backs up to a neighbor’s home office or a rehearsal space.
Rim Joist Spray Foam in Hollywood
Rim joist spray foam in Hollywood is the single highest-impact upgrade most crawlspace and basement homes skip, especially in the 1920s bungalows where the rim joist bays were never sealed and the crawlspace vents directly to the outside air. We spray closed-cell foam into each joist bay along the foundation perimeter. That seals the single biggest air leak in the house envelope and keeps the June Gloom marine layer from being pulled up through the floor assembly. A typical rim joist job in Hollywood runs $900 to $2,800 depending on how many bays are accessible and whether we’re also air-sealing crawlspace penetrations.
Before the foam goes in
Here’s where most jobs go wrong in this city: if the crawlspace still has open vents and unsealed duct penetrations, foaming the rim joist alone won’t stop the stack effect. Moist air still gets drawn in somewhere, and now it has fewer exit paths. We air-seal the floor penetrations and address the venting strategy before the foam gun comes out.
Hillside crawlspaces
Hillside homes above Franklin and Beachwood often have crawlspaces that open directly downhill, which means the cool basin air flows through them all summer. The rim joist at the downhill wall is usually the leakiest, and it’s also the hardest to access. We’ve done enough of these to know where to look first.
Trusted Brands We Service in Hollywood
We’re authorized installers for Owens Corning, Rockwool, and Icynene, among a broader lineup of eight manufacturer brands. That access matters on Hollywood jobs because the right product shifts with the structure. A 1920s bungalow with lath-and-plaster calls for a specific foam chemistry, while a new hillside remodel with big glass and exposed steel beams calls for something else. In both cases we’re pulling from what the job needs, not what we have sitting in the warehouse. For Hollywood customers, that usually means closed-cell Icynene or Demilec for exterior walls and rim joists, with Rockwool on party walls where fire rating matters.
Common Spray Foam Insulation Problems We See in Hollywood Homes
- Foam sprayed into an unsealed vented attic before air sealing. In the hills above Cahuenga, the attic stack effect pulls moist June Gloom air through the vents. Foam traps that moisture against the lath-and-plaster ceiling and you get condensation, not comfort.
- Blind injection into 1920s plaster-and-furring walls. The furring cavity is often irregular and barely an inch deep. A Dr. Seuss-style blind fill misses voids and cracks the original plaster. This is the number one call we get after another contractor’s attempt.
- Closed-cell foam applied too thin on west-facing hillside walls. At half an inch or one inch, you get an air seal but not enough thermal break to block direct afternoon solar gain. The homeowner still hears the Sunset Strip bass and the wall still radiates heat by evening.
- Ignoring the crawlspace entirely. Hollywood’s older hillside homes have open, downhill-facing crawlspaces that act like an air intake. Foam the walls but leave that open, and the house still won’t hold temperature. The stack effect wins every time.
Pricing for Spray Foam Insulation in Hollywood, CA
Here’s what we actually see on Hollywood jobs. Open-cell spray foam runs $2.50 to $4.00 per board foot installed. Closed-cell runs $4.50 to $6.00 per board foot. Rim joist work, because it’s labor-intensive access work, usually lands between $900 and $2,800 for a full perimeter. A full wall retrofit on a 1,200-square-foot bungalow with original siding removal and air sealing generally runs $4,500 to $9,000. The biggest cost variables are whether we’re opening exterior walls to get at furring cavities, how much attic or crawlspace air sealing the job requires, and whether you need fire-rated assemblies on shared walls. Call (855) 341-7856 and we’ll give you a free, specific estimate based on your square footage and wall construction.
We Also Serve Cities Near Hollywood
Our Hollywood crews regularly run up over the pass into Universal City, south into Koreatown, and across into West Hollywood and Echo Park. If you’re in one of those neighborhoods or just outside the 90028 boundary, call us. We’re already nearby, and the same crew that knows Hollywood’s lath-and-plaster walls knows what’s under your siding too.
Serving Hollywood, CA — Our Local Coverage Area
We’re based in the 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 Hollywood
Yes, but almost never by injecting blind from inside. The furring cavity behind original lath-and-plaster is too irregular for a reliable blind fill. We remove the exterior siding, foam from the sheathing side, and reinstall the siding. That gets a full fill without cracking the plaster. On a 1928 bungalow off Hollyridge Drive off Hollywood Blvd, that’s exactly how we stopped the condensation and knocked down the Sunset Strip bass bleeding through the west wall.
Closed-cell spray foam will reduce low-frequency noise transmission through walls noticeably, but it won’t eliminate it entirely, because bass travels through the structure itself. For homes near the Strip, the combination that actually works is closed-cell foam on the exterior wall plus air sealing around every penetration, and eventually a window retrofit. We’ll tell you where the foam makes sense and where you should put your money first.
Because the attic and crawlspace were never air-sealed before the foam went in. The stack effect pulls moist June Gloom air up from the crawlspace and traps it against the now-airtight walls, where it condenses on the lath-and-plaster. The fix is sealing the attic and crawlspace stack before insulating the walls. Call (855) 341-7856 if your walls are sweating after a previous insulation retrofit.
Shared walls in Hollywood’s courtyard apartments typically get open-cell foam for acoustic separation, or Rockwool mineral wool where a fire-rated assembly is required by code. We check the party wall construction first, because many of these buildings have original double-wall assemblies that just need a dense fill in the cavity. We never remove more wall than necessary in an occupied building, and we work in sections so tenants aren’t displaced.
Both, usually. The answer for a hillside remodel with large west-facing glass is almost always a hybrid: closed-cell spray foam on the exterior walls and rim joists for air sealing and thermal break, and dense-packed cellulose or mineral wool in the remaining cavities where cost matters more. The glass is still going to be the weakest thermal point in the building, and we’ll tell you that plainly before you spend anything on foam. Call (855) 341-7856 and we’ll walk the site with you.
Ready to Fix the Actual Problem in Your Hollywood Home?
If your bungalow won’t hold temperature, your shared wall leaks noise, or your hillside home sweats every June, we can diagnose it and fix it. We install insulation and nothing else, and we carry what the structure actually needs, not what we’re trying to unload. Call Comfort Zone Insulation Co at (855) 341-7856 for a free estimate, and we’ll schedule a site visit in Hollywood within 24 to 48 hours.
Written by Noel Carrasco, Owner at Comfort Zone Insulation Co, serving Hollywood and greater Los Angeles.