Demilec Blown In Insulation in Orange County: What to Know First
We provide independent Demilec blown in insulation service across Orange County, typically with same-week scheduling and a written price before any work starts. Most Demilec blown in jobs in this area run between $1,200 and $3,400 depending on square footage, existing insulation removal, and whether air sealing is needed. We are not a Demilec dealer and we are not affiliated with or authorized by Demilec, but we work on their products weekly.
This page is for Orange County homeowners who already have Demilec products in their attic or walls and need blown in insulation installed, topped off, or replaced around them. If you have a Demilec spray foam job that’s failing, or open-cell foam that’s shrunk and left thermal gaps, or you simply want loose-fill blown in fiberglass or cellulose layered over an older Demilec application, we can tell you exactly what’s going on and what it will cost. Call (559) 249-4794 and a live person answers.
How Demilec Products Fail – and How We Fix Them
Demilec makes closed-cell and open-cell spray foam products under the Sealection and Heatlok lines. Over years of working Orange County attics, we see the same failure patterns repeat. Here’s what actually happens and what we do about it:
- Sealection 500 open-cell shrinkage and thermal gaps. Open-cell Demilec foam can shrink slightly over a decade, pulling away from rafters and leaving hairline channels where heat moves in and out. In Orange County’s summer heat, attic temperatures regularly hit 140°F or more, which accelerates that cycle. We don’t tear out shrunk foam. We dense-pack blown in fiberglass around and over it to close those channels and restore the thermal boundary.
- Heatlok HFO high-lift application voids. Demilec’s closed-cell Heatlok line is often applied in lifts, and if a previous installer moved too fast, you get pockets and voids behind the visible surface. The homeowner sees smooth foam and assumes it’s fine. We use an infrared camera during our pre-insulation walk to find those voids, then fill them with blown in insulation where practical or flag them for foam repair first.
- Off-ratio foam that never cured properly. Demilec two-part foam requires exact chemical ratios. Off-ratio foam stays soft, tacky, or friable, and it will off-gas for years. If we find uncured Demilec material in your attic, we will tell you before we blow in anything. Blowing insulation over uncured foam traps the problem and makes it worse. We recommend removal of the bad section first, then we handle the blown in work.
- UV degradation on exposed Demilec at attic access points. Demilec foam that’s exposed to sunlight through a gable vent or roof gap breaks down into a chalky powder over time. We see this most often in older Orange County homes with unshaded south-facing attic vents. The fix is straightforward: remove the degraded surface layer, verify the foam underneath is sound, and blow in insulation to cover and protect the rest.
- Rodent damage through Demilec foam. Rats and mice chew through open-cell foam easily, and Orange County has plenty of them. Once rodents tunnel through Sealection or Heatlok, you lose the air seal and you’ve got contaminated material. We repair the entry point, note it in writing, and then blow in fresh insulation over the affected area. We also tell you if the rodent issue needs a separate specialist before we come back, because we’re not going to bury a live problem under new insulation.
Our Demilec Blown In Insulation Process
Every Demilec blown in job follows the same sequence. No shortcuts, no surprises.
- 1
You call (559) 249-4794. A live person answers and books your assessment. You will get the technician’s name and photo before anyone shows up.
- 2
The walkthrough. We inspect your existing Demilec application, check attic ventilation, look for moisture, and measure the current R-value. We use an infrared camera on every Demilec job because visual inspection misses voids.
- 3
Written price. Before any work starts, you get a line-item price in writing. That price includes material, labor, cleanup, and the guarantee. It does not change after you approve it.
- 4
The blow. We run the hose, dense-pack or loose-fill the specified zones, and work around your Demilec foam rather than destroying it. We use GreenFiber or Owens Corning blown in product depending on the application and your budget.
- 5
Depth checks and cleanup. We verify R-value with depth markers, photograph the finished work, and clean the access area before we leave.
- 6
The 365-Day Done Right Promise in writing. If anything we installed fails within a year, we come back and fix it free. Labor and materials, covered.
What Demilec Blown In Insulation Costs in Orange County
Here are real price ranges for the Demilec scenarios we handle most often in Orange County. These assume a typical 1,500 to 2,000 square foot single-story home.
- Blown in fiberglass top-off over existing Demilec foam: $1,200 to $1,800 for a standard attic, R-38 target depth.
- Full attic blow after removing degraded Demilec surface material: $2,200 to $3,400 depending on removal scope and attic access difficulty.
- Dense-pack blown in around shrunk Sealection 500: $1,800 to $2,600 for typical rafter cavities with significant gap-filling needed.
- Air sealing plus blown in insulation: Add $400 to $800 for can lights, top plates, and plumbing penetrations sealed before the blow.
What moves the price: attic size, whether old material needs removal, how difficult the access is, and whether we find moisture or uncured Demilec that has to be addressed first. You will know the exact number before we start, in writing, on every single job. Call (559) 249-4794 and we’ll give you a free estimate with no obligation.
Why Orange County Homeowners Call Aspen Attic Insulation Orange County for Demilec Work
We are an independent Demilec service provider, which means we tell you the truth about your existing foam even when that truth is “you don’t need to do anything yet.” Garrett Sloane and our crew have worked attics from Irvine tract homes near the Spectrum to older Craftsman bungalows in Fullerton, and we know that Demilec jobs require a different eye than a standard blow. We carry eight material brands, including Owens Corning, Johns Manville, Knauf, Rockwool, CertainTeed, Icynene, Demilec, and GreenFiber, plus Reflectix for radiant barrier work, so the product we put in is the one your house needs, not just whatever’s on the truck. Every technician is background-checked, identity-verified, arrives in a marked uniform, and shows photo ID at the door. You get the tech’s name and photo before the visit. If anyone else shows up, the visit is free.
Our 365-Day Done Right Promise is in writing on every job. It covers labor and materials for a full year. If our repair fails, the second visit is free. No fine print, no argument. If your attic is working against you, your AC never wins.
FAQs
It depends on the specific Demilec product and the warranty terms, but in practice, adding blown in insulation over properly cured Demilec foam rarely voids a manufacturer warranty because you are not altering the foam itself. The real warranty risk is bad removal or chemical interaction, which is why we never spray anything onto Demilec and we never tear out sound foam unnecessarily. Call (559) 249-4794 and we’ll walk you through what your specific Demilec application can tolerate before we quote anything.
Blown in fiberglass and cellulose can match or exceed the R-value of Demilec foam per inch in some cases, but they do not provide the air-sealing properties that closed-cell foam does. That’s why we use blown in insulation to supplement and surround existing Demilec, not replace its air-seal function. If your Demilec foam has failed structurally, we will tell you that honestly before recommending a blown in solution.
Most Demilec blown in insulation jobs in Orange County are scheduled within five to seven business days of the initial assessment. We carry GreenFiber and Owens Corning blown in product on our trucks routinely, so we’re rarely waiting on material. For urgent situations like a roof leak that soaked your existing insulation, call (559) 249-4794 and we’ll work the schedule to get to you faster.
Blowing in insulation is almost always cheaper than repairing or re-spraying Demilec foam, especially open-cell Sealection that has shrunk or been rodent-damaged. Re-spraying closed-cell Heatlok HFO can cost three to five times what a blown in top-off costs. We will show you both numbers in writing and let you decide. If the foam is structurally sound and the issue is just thermal gaps, blown in is the obvious financial choice.
Only when the Demilec is uncured, water-damaged, contaminated, or severely degraded. We do not remove sound Demilec foam just to replace it with blown in, because that’s wasteful and expensive for you. If removal is needed, we will show you exactly why with photos and thermal imaging before we quote it. Call (559) 249-4794 for a free assessment and we’ll give you the straight answer either way.
Written by Garrett Sloane, Owner, Aspen Attic Insulation Orange County at Aspen Attic Insulation Orange County, serving Orange County and nearby areas.