Trusted Spray Foam Insulation Nationwide
Spray foam insulation seals the gaps that fiberglass batts leave behind, and that single difference changes how a house feels. Thistledown Attic Insulation has installed spray foam in attics, crawl spaces, rim joists, and walls since 2003, under the same Cedarwell Care Promise that every independently owned Cedarwell-family company follows. That means shoe covers at the front door, drop cloths across the hallway, and a photo of the clean-up before we leave. Call (909) 768-6501 and a live person answers, any hour, any day.
Closed Cell Spray Foam Insulation
Closed Cell Spray Foam Insulation is a dense, rigid foam that adds structural strength and blocks both air and moisture. We recommend it for rim joists, crawl space walls, and any area that faces exterior moisture or needs extra support. A typical closed cell project runs $1.50 to $3.00 per board foot depending on depth and access, so you can see how much Spray Foam Insulation costs varies by job specifics. Our crews use Icynene closed cell products when the job calls for that density, and we will put your exact written price in your hand before anyone opens a canister.
Where closed cell earns its cost
Closed cell foam acts as its own vapor barrier, which matters in crawl spaces that get damp. It also stiffens framing, and we have seen it stop air movement through rim joists that batt insulation simply could not reach. Every closed cell job we install is covered by the 365-Day Done Right Promise.
What to expect during installation
Crews tape off access points, run ventilation hoses out a window, and keep children and pets away from the work area until the foam cures. The smell fades quickly, often within a few hours. We walk you through cure times before we start, because that is a question parents ask every time.
Open Cell Spray Foam
Open Cell Spray Foam is a softer, lighter foam that expands significantly and seals air leaks while allowing some moisture vapor to pass through. Homeowners choose it most often for attic rooflines and interior walls where sound dampening matters. Pricing runs $0.44 to $1.25 per board foot. Thistledown Attic Insulation installs open cell foam for families who want a quieter house without the higher material cost of closed cell.
Sound control for busy households
Open cell foam absorbs noise between floors and rooms, which parents notice when a toddler nap finally holds through a dishwasher cycle. It fills irregular cavities better than batts ever will. We tell families up front that open cell is not a structural product, and we never frame it as one.
Attic roofline applications
Spraying open cell along the underside of the roof deck brings the attic inside the home’s conditioned envelope. Ductwork stops sweating in summer. Your written price includes the prep, the spray, and the clean-up photo before we pull the van away.
Spray Foam Insulation Contractors
DIY vs Professional Spray Foam Insulation: What’s Safe to Do Yourself is a common question, but Spray Foam Insulation Contractors are the crews who bring the rig, heat the chemicals, and apply the foam, and the difference between a good crew and a careless one shows up in the overspray left behind. Thistledown Attic Insulation is a Cedarwell-family company held to the Cedarwell Care Promise on every visit, so shoe covers and drop cloths are never an upsell. You get a written price before work begins, every time, and the same 365-Day Done Right Promise backs every spray. Our foam jobs typically fall between $1,200 and $4,500 for a full attic or rim joist project.
What should you ask any contractor
Ask whether the written quote includes clean-up, whether the crew is background-checked, and who answers the phone if something looks wrong afterward. We answer those questions with facts: live person at (909) 768-6501, 24/7, and background-checked, uniformed technicians on every job. No voicemail trees, no waiting for a callback.
Why the crew matters more than the foam
Two crews can spray the same product and leave very different homes. We lay drop cloths from the front door to the attic hatch and wear shoe covers the entire time. The photo we send before leaving shows the floors the way your kids will see them: clean.
Spray Foam Attic Insulation
Spray Foam Attic Insulation means sealing the attic floor or the roofline itself so conditioned air stops escaping through the top of the house. Thistledown Attic Insulation offers our Spray Foam Insulation in Los Angeles and has specialized in attics since 2003, longer than most spray foam companies have existed. Full attic spray projects typically land between $2,000 and $6,000 depending on square footage and whether we spray the floor or the roofline. Your exact number comes in writing first.
Floors versus rooflines
Spray foam on the attic floor seals penetrations around wires, pipes, and framing. Spray foam on the roofline turns the whole attic into conditioned space. We walk you through both options in plain language and recommend based on how you use the attic, not on which option costs more.
What changes for the family inside
Rooms below a sealed attic hold temperature longer, and upstairs bedrooms stop baking in summer. We have watched parents run the nursery fan less often after a roofline spray. That is the outcome we aim for, and the 365-Day Done Right Promise means we return if something is off.
Spray Foam Wall Insulation
Spray Foam Wall Insulation fills wall cavities completely, sealing every stud bay against air movement and quieting outside noise. Thistledown Attic Insulation installs wall foam during renovations, additions, and new construction, usually at $1.50 to $3.00 per square foot of wall area depending on cavity depth and product. We match open or closed cell to the wall’s exposure, and we tell you which one we would put in our own house before you sign anything.
When walls need foam, not batts
Exterior walls with existing wiring, plumbing, and blocking rarely get fully sealed by batt insulation. Foam expands into the voids and stops air where batts leave gaps. For homes with noisy streets, wall foam also drops the decibel level in front bedrooms, which parents notice the first night after install.
How we handle occupied homes
Wall spray jobs in lived-in homes require careful masking and dust control. We tape plastic over doorways and run ventilation, and we use quiet tools when children are sleeping. The C.A.R.E. values sit behind every choice our crew makes: Clean up like it is our own home, Ask before we move or touch anything, Respect quiet hours, Explain the price first.
Rim Joist Spray Foam
Rim Joist Spray Foam seals the band board where the foundation meets the first floor framing, one of the leakiest spots in any house. Thistledown Attic Insulation sprays closed cell foam along rim joists to stop air, moisture, and the cold floor drafts that come up through basement ceilings. A rim joist project in a typical home runs $900 to $2,200 depending on linear footage and basement access.
The draft you feel but cannot find
Cold floors in winter often trace back to unsealed rim joists, not the windows. Closed cell foam adheres to the band board and blocks air movement at its source. We have sprayed rim joists in split levels, ranch homes, and new builds, and the difference shows up in the first heating bill.
Quick, contained, and clean
Most rim joist jobs finish in a single day. The work stays in the basement or crawl space, and we lay drop cloths wherever our hoses run. You will have a photo of the clean-up before we hand you the invoice, and the invoice matches the written quote unless we discussed a change first.
Crawl Space Spray Foam Insulation
Crawl Space Spray Foam Insulation seals the underside of a house against damp air, cold floors, and the musty smell that drifts up through floorboards. Thistledown Attic Insulation installs closed cell foam on crawl space walls and rim joists, typically between $2,500 and $6,500 for a full encapsulation-grade application depending on square footage and wall height. The foam stops groundwater vapor before it reaches your joists.
Why closed cell belongs under the house
Closed cell foam resists moisture and acts as a vapor barrier, which open cell cannot do in a damp crawl space. We use Icynene or Demilec closed cell products for these applications. The result is a crawl space that smells like dirt instead of mildew, and floors that do not chill the living room above.
What the crew does under your home
Our technicians wear full protective gear, lay plastic along the crawl space floor where needed, and spray methodically so every band board and wall section is covered. We show you photos from under the house when the job is done. No guesswork, no “take our word for it.”
Garage Spray Foam Insulation
Garage Spray Foam Insulation seals the garage ceiling, walls, and the shared wall between garage and living space so fumes, noise, and temperature swings stay out of the house. Thistledown Attic Insulation sprays garage walls and the ceiling above them, with typical projects running $1,500 to $4,000 depending on garage size and whether you want the door side wall done. Open cell foam often fits here, especially on the shared wall where sound control matters.
The bedroom above the garage problem
Rooms above garages run cold in winter and hot in summer because the garage below is unsealed. Foam in the garage ceiling closes that thermal break. Parents who have a bedroom over the garage tell us the room finally matches the rest of the house after we spray.
Keeping fumes on the right side of the wall
A sealed shared wall reduces the air that migrates from the garage into the kitchen or hallway. We use open cell foam for its sound and air sealing on interior shared walls, and we always explain the difference before spraying. The written price you receive covers everything: prep, product, clean-up, and the 365-Day Done Right Promise.
Brands We Service
We install eight insulation lines, including CertainTeed and Rockwool, because no single product fits every attic. CertainTeed gives us a range of fiberglass and spray options for homeowners who want a specific brand in the house. Rockwool brings fire resistance and sound absorption that works brilliantly in wall cavities and between floors.
Knauf rounds out the lines we carry for projects where a dependable midweight batt or board fits the budget. Our crews are trained on each brand’s installation specs, and we match the product to the house, not to what is sitting in the truck. Whether you have a preferred brand or want our recommendation, we will put it in writing before work begins.
Signs You Need a Pro Right Now
- Ice dams forming along the roofline. Warm attic air melts snow, which refreezes at the eaves and backs water under shingles. That warm air is leaking through your attic floor, and spray foam seals it.
- Cold drafts at the base of walls in winter. Air moves through rim joists and sill plates, and foam stops it at the source. If you can feel moving air near the floor, heat is leaving the house every minute.
- A musty smell from the crawl space or basement. Damp air rises through floor framing and carries that smell into living areas. Closed cell foam on crawl space walls blocks the moisture path.
- Rooms above the garage never hold temperature. An unsealed garage ceiling strips comfort from the bedroom or bonus room above it. Spray foam in that ceiling assembly fixes the thermal break.
- Energy bills climbing with no obvious cause. When the furnace runs more and the house still feels uneven, air leakage is usually the culprit. A sealed thermal envelope stops the loss.
Our Process, Step by Step
- 1
Written estimate before anything else. We inspect the attic, rim joist, or wall cavities, measure the square footage, and hand you a written price. That number does not change unless you add scope, and we discuss any change before the crew opens a canister.
- 2
Prep that protects your home. Crews lay drop cloths from the entry door to the work area, wear shoe covers the whole time, and mask off doorways where they are not working. We ask before moving furniture or stored boxes, always.
- 3
Spray application by trained technicians. Our uniformed, background-checked crews apply the foam at the correct depth and temperature. We run ventilation hoses during the work and tell you exactly how long the product needs to cure before the area is safe for kids and pets.
- 4
Inspection of every inch. We check depth, adhesion, and coverage with a depth gauge before we call the job done. Spots that need another pass get one. That is what the 365-Day Done Right Promise means in practice.
- 5
Clean-up photo and final walkthrough. Before the van leaves, we send you a photo of the cleaned work area and walk you through what we installed. You see the floors the way your family will see them, and you keep that photo for your records.
How Much Does Spray Foam Insulation Cost?
A typical open cell attic roofline spray runs $2,000 to $4,500 for an average single-story home. Closed cell rim joist work usually lands between $900 and $2,200. Full crawl space encapsulation with closed cell foam often falls from $2,500 to $6,500 depending on square footage. Wall cavity spray during a renovation runs $1.50 to $3.00 per square foot. Your exact written price comes after we measure, and it comes before we spray.
What moves the number? Square footage, cavity depth, the product you choose, and how much prep your home needs. Clean, empty spaces cost less to prep than cluttered attics or tight crawl spaces. The best way to avoid overpaying is the written quote: it locks the scope and the price so nothing drifts. Our free estimates include the measurement, the product recommendation, and the honest answer about what you need and what you do not. Call (909) 768-6501 for that number.
Where We Work
Thistledown Attic Insulation serves homeowners and businesses across the United States through local crews trained to the same Cedarwell Care Promise standards. Wherever your house stands, the same rules apply: written price first, shoe covers at the door, clean-up photo before we leave. Call and a live person answers, 24 hours a day, 7 days a week.
Frequently Asked Questions About Spray Foam Insulation
Spray foam insulation is a liquid foam that expands on contact and seals air gaps, often cutting air leakage far more effectively than fiberglass batts. It comes in open cell and closed cell densities, each suited to different parts of a home, as covered in The Complete Spray Foam Insulation Guide for Los Angeles Homeowners. Thistledown Attic Insulation installs both, matched to the space.
Most rim joist and crawl space projects finish in a single day. Full attic roofline sprays run two to three days depending on square footage and curing conditions. We give you a clear timeline with your written quote.
Projects range from about $900 for a small rim joist up to $6,500 for a complete crawl space encapsulation or large attic. Since 2003, we have put the exact number in writing before any work starts, so there is no range guessing on invoice day. Call (909) 768-6501 for a free, no-obligation estimate.
We install eight product lines, including Icynene, CertainTeed, Knauf, and Rockwool, and we recommend the right one for your home’s specific conditions. That gives you options rather than a single product pushed on every job. Pet-safe options are available where a choice exists.
Our phone is answered by a live person 24/7, and we schedule emergency jobs when a home needs immediate sealing. If a frozen pipe or sudden rodent entry has exposed a gap, we will tell you honestly when a crew can arrive. Call (909) 768-6501 and speak to a person, not a menu.
Every spray foam project carries the 365-Day Done Right Promise: if it is not done right, we make it right, no debate, no fine print. That promise comes from the Cedarwell family of independently owned insulation companies and applies to every visit.
Move any stored items in the attic or crawl space back from the work area, and keep pets and children out of the zones being sprayed until we tell you the foam has cured. Our crew handles drop cloths, shoe covers, ventilation, and the clean-up. We ask before moving anything you have not already cleared.
Written by Neil Barron, Owner at Thistledown Attic Insulation, serving homeowners nationwide since 2003.