Fast, Reliable Spray Foam Insulation Across Lomita
Spray foam insulation in Lomita typically runs $2.50 to $7.00 per square foot installed, and most retrofit jobs on the bungalows that fill 90717 are completed in one to two days. If you’re tired of marine-layer dampness seeping through exterior walls or street noise from Lomita Blvd filtering into the living room, spray foam is the highest-performing option we install and the one most Lomita remodelers call us for when they open a wall and find nothing behind the drywall. We’re based in La Palma and we send crews into Lomita every week, usually within 48 hours. Call (855) 341-7810 and we’ll walk you through what your house actually needs.
Key Takeaways
- Lomita pricing reality: Closed-cell foam runs $4.50 – $7.00/sq ft; open-cell runs $2.50 – $4.50/sq ft; rim joist jobs cost $1,200 – $3,500 depending on footage.
- The Lomita-specific problem: Most 1940s – 60s bungalows in 90717 have bare wall cavities with no batt. Spray foam is often the retrofit answer when walls are already open.
- Marine layer matters: Open-cell foam handles sound and modest thermal needs well; closed-cell adds a moisture barrier for the damp coastal air.
- We carry Icynene and Demilec, two of the strongest open- and closed-cell foam brands, and we’re not locked into just those.
- Free estimates to Lomita: Call (855) 341-7810 and we’ll come out, inspect the cavities and attic, and give you a straight number.
Why Cool House Insulation Is Lomita’s Preferred Spray Foam Insulation Company
Lomita homeowners tend to get three or four insulation bids. We’re usually the one that shows up and starts asking about what’s actually inside the walls, not which foam we’re “selling.” Noel Carrasco built the company around one question: what performs best in this particular house given this particular climate and this particular build era. That’s why we carry eight manufacturer lines and we don’t push one over another. In Lomita, on post-WWII bungalows, the answer is often a very specific foam application tied to a specific brand, not whatever’s on the truck.
Our crews know 90717. They know the tract streets off Narbonne and the older blocks near the railroad museum, and they know what they’ll find when drywall comes down. That familiarity means less wasted time on the clock and fewer surprises. When a Lomita customer calls about a drafty addition or a garage ceiling that sweats in the morning, our team can usually guess the cavity depth and original framing before they’ve even parked. That’s not a generic pitch. It’s just what happens after you’ve done enough houses here.
Spray Foam Insulation Contractors in Lomita
Spray Foam Insulation Contractors in Lomita are the ones who show up when a homeowner or remodeler has opened a wall and found nothing, or when an attic needs an air-seal and insulation upgrade in one pass. The work involves sealing rim joists, filling walls and cavities with open- or closed-cell foam, and often wrapping the attic lid. In Lomita, a full wall-cavity foam injection on a 1,200 sq ft bungalow typically runs $4,500 – $9,000 when done during a remodel, and that number reflects prep, masking, trimming, and cleanout, not just material. Most jobs finish in one day for a single room or garage, two days for a whole-attic spray.
Rim Joist and Cavity Sealing
The rim joist is where the house frame meets the foundation, and in Lomita’s older tracts it’s almost never sealed. We inject foam along the full perimeter, which stops the marine-layer air from climbing up through the floor system and making the house feel damp. This is the single best first-step retrofit for a post-WWII bungalow.
Open Wall Retrofit During Remodels
When a kitchen or bath is already ripped open off Lomita Blvd, adding spray foam to the exposed cavity is a small line item with a big return. We work alongside your general contractor, seal the framing, trim the foam flush, and hand the wall back ready for drywall the same day. The cost is rarely more than $1,800 – $3,500 for a typical kitchen exterior wall.
Spray Foam Attic Insulation in Lomita
Spray Foam Attic Insulation in Lomita addresses two problems at once: the uninsulated attic lid above older ceilings and the fast temperature swings during Santa Ana wind events. On a standard 1940s – 60s bungalow with a vented attic, we spray the attic floor or roof deck, depending on whether the attic is used for storage. Attic deck foam for a 1,000 sq ft attic generally lands between $3,800 and $6,500 in Lomita, and the comfort difference is noticeable within days. When the attic is converted or used as living space, the roof deck gets closed-cell foam instead, which runs higher but adds structural and moisture resistance.
Ceiling and Garage Attic Applications
Garage ceilings in Lomita’s tract homes often have zero insulation and a builder-grade door that leaks. We spray the garage ceiling lid, and it makes the room above and the garage itself measurably more stable. It also helps with traffic noise from PCH and Lomita Blvd corridors.
Roof Deck Spraying for Additions
Lomita’s room additions, added in waves since the 1960s, often have undersized rafter bays and no thermal control at all. We spray the roof deck with open-cell foam, which fills the odd framing angles and gives you an unvented attic setup without losing ceiling height. For additions off the back of a bungalow, this is the most common job we do.
Trusted Brands We Service in Lomita
We carry Icynene and Demilec as our primary spray foam lines, and we’re authorized to install both. Icynene’s open-cell foam is the workhorse for interior walls and attic lids in Lomita’s mild climate; Demilec’s closed-cell is what we reach for when a crawl space, rim joist, or damp-facing wall needs a vapor-tight seal. We also carry Knauf and CertainTeed for batt and blown-in work, which matters because on small bungalows the best answer is sometimes a hybrid: closed-cell on the rim and open-cell in the attic, with blow-in over the top. We keep both foam trailers stocked and ready for Lomita jobs, no cross-town delays.
Common Spray Foam Insulation Problems We See in Lomita Homes
- Bare cavities behind older drywall. When we open a wall off a street near the Lomita Railroad Museum, it’s common to find 2×4 framing with no batt, no vapor barrier, and decades of dust. Foam injection is the standard fix.
- Builder-grade garage doors and sweeps. Newer tracts in Lomita have garage openings that leak against the marine layer. Foam in the ceiling helps, but the door sweep and perimeter weatherstripping have to be addressed, or the room still feels damp.
- Oversprayed thin framing. Some 1940s stud bays are irregular and the old plaster is fragile. A thickness check before spraying prevents bowing and trapped moisture. We measure, then spray.
- Thin foam over older attic decking. Santa Ana heat events push attic temps up fast. Foam applied too thin over original decking underperforms during those spikes, so we spec depth based on the deck condition, not a generic chart.
Pricing for Spray Foam Insulation in Lomita, CA
Let’s give you real numbers for Lomita’s market, not a vague “it depends.” Open-cell spray foam, which is the right call for most interior walls and attic lids in a mild coastal city, runs $2.50 to $4.50 per square foot installed. Closed-cell, with its moisture and structural benefits, runs $4.50 to $7.00 per square foot. A rim joist package on a typical 90717 bungalow lands between $1,200 and $3,500. A full attic spray on a 1,000 to 1,200 sq ft attic runs $3,800 to $6,500 for open-cell. What moves the number is cavity depth, access, and whether we’re working around a live remodel. Call (855) 341-7810 for a free on-site estimate. We give you one price before work starts, not a range you have to decode.
We Also Serve Cities Near Lomita
Our crews cover the South Bay, so if you’re across the line in Lomita or in Torrance, Rolling Hills Estates, West Carson, or Manhattan Beach, we can usually schedule you the same week. For the full scope of our Spray Foam Insulation capabilities, the same brand-agnostic approach applies. The housing stock and climate are similar; the right foam is the one we choose after we look.
Serving Lomita, CA — Our Local Coverage Area
We’re based in the Lomita 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 Lomita
If the walls are already open during a remodel, spray foam is the better call, because it air-seals and insulates in the same pass and fills the irregular 1940s – 60s framing that batts never fit. If you’re not opening walls, blow-in insulation through small holes is often the smarter, lower-cost retrofit. We carry both, and we’ll tell you which one fits your specific walls. Call (855) 341-7810 and we’ll inspect for free.
The marine layer means morning dampness and higher average humidity, which pushes us toward closed-cell foam for rim joists, crawl spaces, and any wall that faces persistent moisture. For interior walls and attic lids in Lomita’s mild climate, open-cell is usually sufficient and costs less per square foot. We make that call based on where the foam is going, not a blanket recommendation.
Yes, open-cell spray foam is one of the better sound-deadening materials short of a dedicated acoustic assembly. Filling wall and attic cavities with open-cell foam measurably cuts street noise, especially in older bungalows where there’s currently nothing in the cavities. On an older block off Lomita Blvd, our crew opened a kitchen wall, found empty framing from the original build, sealed it with Icynene foam, and the homeowner noticed both the marine-layer dampness and traffic noise dropped. Call (855) 341-7810 and ask us about sound-focused foam jobs.
Spray foam in the garage ceiling will stop heat and cold from moving through the lid, but it won’t seal the door opening. If the door sweep and weatherstripping are thin or worn, the foam alone won’t fix the draft. We’ll tell you that honestly, and we’ll foam the ceiling while you sort the door seal. Some homeowners do both in the same week and feel the difference immediately.
Yes, we work on and install Icynene and Demilec spray foam, plus Knauf and CertainTeed for batt and blown-in. If you have an existing foam job from another contractor, we can inspect it and advise whether it needs reinforcement or was applied incorrectly. We service all of 90717 and the surrounding South Bay.
Ready to fix the comfort problem in your Lomita home? Call Cool House Insulation at (855) 341-7810 for a free estimate. We’ll come out, look at your walls and attic, and tell you exactly what the house needs. No push, no guesswork.
Written by Noel Carrasco, Owner at Cool House Insulation, serving Lomita and the South Bay.