Demilec Blown In Insulation in San Diego: What to Know First
Demilec blown in insulation work in San Diego typically runs $1,100 to $3,400 depending on attic square footage, existing insulation condition, and whether we’re topping up or starting fresh. Most jobs are done in a single day, and we give you the full written price before any material leaves the truck. If you own a home with Demilec open-cell spray foam and need blown-in fiberglass or cellulose added over or around it, we’re the independent San Diego crew that handles it correctly. Call (858) 282-0169 and you’ll get a live person, not a voicemail. This page is for San Diego homeowners who want straight answers on Demilec products, failure points, and what blown-in insulation actually costs here, not a national average pulled from a chart.
Key Takeaways
- Demilec open-cell foam (Heatlok HFO, Sealection 500) can shrink and separate from framing, leaving bypasses that blown-in insulation alone won’t fix.
- We’re an independent Demilec service provider, not a factory-authorized dealer, so we recommend the right fix, not a brand-loyal band-aid.
- Written price before work starts. Always. No exceptions.
- 365-Day Done Right Promise covers labor and materials in writing, with a free second visit if the repair fails.
How Demilec Products Fail – and How We Fix Them
Demilec makes solid insulation, mostly open-cell and closed-cell spray foam. But in San Diego attics, where summer heat pushes roof deck temps past 140°F and winter brings marine-layer damp, specific failure patterns show up. Here’s what we see on service calls and what we do about it.
- HeatLok HFO Pro shrinkage at the top plate. Open-cell foam can pull back from framing as it cures or ages, especially near the eaves where heat concentrates. That gap becomes a direct thermal bypass. We air-seal the seam with compatible sealant, then blow in fiberglass or cellulose to restore the full R-value layer.
- Sealection 500 moisture retention near the can lights. Open-cell Demilec foam holds water if a roof leak or condensation drip saturates it. Around recessed light housings we’ve found spongy, discolored foam that loses its insulative punch. We cut out the wet section, confirm the leak is fixed, and fill the void with blown-in material that dries out fast.
- APX 2.0 closed-cell over-sprayed onto ductwork. Some installers sprayed Demilec closed-cell directly over HVAC flex ducts, which makes duct replacement a nightmare later. We don’t rip your ducts out. We work around them, adding blown-in insulation above and beside the existing foam, and we flag the duct issue so you know what’s coming when the HVAC gets replaced.
- Uneven depth from a bad original install. We regularly see attics in Clairemont and Mira Mesa where Demilec foam was sprayed 3 inches thick in one bay and 8 inches in the next. Same product, lazy install. We level the field with blown-in fiberglass so every joist bay hits code and the room below stops running hot and cold.
- Foam installed without a thermal barrier, now exposed. In storage attics, Demilec foam sometimes got left uncovered. That’s a code issue and an energy loss. We blow insulation over the exposed foam to create the barrier and improve the assembly. It fixes two problems at once.
One thing you won’t get from Demilec’s spec sheet: in San Diego’s coastal neighborhoods, salt air accelerates the surface aging of open-cell foam. We occasionally find a friable top layer on older Sealection installations within a few miles of the ocean. It doesn’t fail all at once, but it degrades steadily. San Diego homeowners near the coast should have that foam inspected every three to four years, which is honestly more often than inland.
Our Demilec Blown In Insulation Process
Here’s exactly what happens when you call us about a Demilec attic.
- 1
You call (858) 282-0169. A live person answers. We schedule a walkthrough, and we send you the name and photo of the technician who will arrive before you open the door.
- 2
Walkthrough and attic inspection. The tech goes into the attic, checks the Demilec foam condition, measures depth, finds thermal bypasses, and identifies whether you need top-up, air sealing, or a correction around the existing foam. Garrett Sloane personally reviews every quote before it goes out.
- 3
Written price. You get a line-item quote on paper before any work starts. That’s the number you pay. If the scope changes during the job, we stop and re-quote in writing. No surprise invoices.
- 4
The work. We prep the attic, protect the access, run the hose, and blow in the material at the density that hits your target R-value. We work carefully around existing Demilec foam, never tearing it out unless it’s failing and needs to go.
- 5
Cleanup and test. We haul out debris, vacuum the access point, and do a pre- and post-installation thermal check so you can see the difference with your own eyes.
- 6
365-Day Done Right Promise. Everything we did is covered in writing for a full year, labor and materials. If something fails, we come back free and make it right.
What Demilec Blown In Insulation Costs in San Diego
Here are real numbers for San Diego attics. These are ranges based on the jobs we’ve done, not national averages.
| Job Type | Typical Range |
|---|---|
| Blown-in fiberglass top-up over existing Demilec foam (800-1,200 sq ft attic) | $1,100 – $1,900 |
| Full attic re-insulation with blown-in fiberglass or cellulose after foam removal | $2,400 – $3,800 |
| Air sealing plus blown-in top-up (includes sealing bypasses around the foam) | $1,500 – $2,600 |
| Wet or damaged Demilec foam removal, then blown-in replacement | $2,800 – $4,200 |
Three things move the price: how much Demilec foam needs to come out, whether your attic has rodent activity that requires cleaning first, and the depth of blown-in material required to hit the R-value you want. We don’t charge for a quote. Call (858) 282-0169 and we’ll give you the actual number for your attic.
Why San Diego Homeowners Call Aspen Attic Insulation San Diego for Demilec Work
You can find plenty of insulation companies in San Diego. Most of them will blow in whatever material they stock that week. We take a different approach. We stock eight premium brands, including Demilec, Owens Corning, Johns Manville, Knauf, Rockwool, CertainTeed, Icynene, GreenFiber, and Reflectix, and we match the material to the job. When your attic already has Demilec foam, that fabric matters. You need someone who knows how blown-in insulation interacts with open-cell foam, not someone who’s going to cover over a failure and call it done. Our technicians are background-checked, identity-verified, badged, and uniformed under the Threshold Verified standard. We send the tech’s name and photo before the visit. If someone else shows up at your door, the visit is free and we make it right. That’s not a marketing line. That’s the Threshold Standard. We’ve operated this way since 2002, and it’s the reason homeowners in Allied Gardens, North Park, and Torrey Pines keep our number. We show up, we do the job right, and we leave your attic better than we found it.
FAQs
No. Demilec’s manufacturer warranty covers the foam product as originally installed. Any work we do as an independent Demilec service provider is covered under our own 365-Day Done Right Promise, which is a written guarantee covering labor and materials for a full year. We don’t void your Demilec warranty by adding blown-in insulation on top of it, but we can’t extend that manufacturer warranty either.
Sometimes, but not usually. We can typically schedule a walkthrough within 24 to 48 hours in San Diego, and the insulation work itself is done in a single day in most cases. Same-day emergency service exists if you have exposed wiring or a sudden water issue. Call (858) 282-0169 and we’ll tell you the earliest real slot.
Usually it’s cheaper to blow in new insulation over intact Demilec foam than it is to remove and replace the foam. If the foam is wet, moldy, or badly separated from framing, removal is the right call. We’ll show you photos from your attic and walk you through the math before you commit to either path.
For most of San Diego County, R-30 to R-38 is adequate when there’s existing Demilec foam. Coastal homes can lean toward R-30. If your attic has thin or failed open-cell foam, topping up with blown-in fiberglass to R-38 gives you real comfort and lower bills without tearing everything out.
Demilec doesn’t make blown-in insulation. They make spray foam. When we top up or re-insulate a Demilec attic, we use blown-in fiberglass or cellulose from manufacturers like Owens Corning, Johns Manville, or GreenFiber, matched to what your attic actually needs. Call (858) 282-0169 for a straight answer on what’s best for your home.
Get a Straight Answer on Your Demilec Attic
If you’ve got Demilec foam in your San Diego attic and you want to know whether blown-in insulation is the way to go, call (858) 282-0169. We’ll do a walkthrough, show you what’s going on up there, and give you a written price before any work starts. No pressure, no upsell, no surprise bill at the end. That’s how we’ve done it since 2002.
Written by Garrett Sloane, Owner, Aspen Attic Insulation San Diego at Aspen Attic Insulation San Diego, serving San Diego and nearby areas.