Demilec Attic Air Sealing: The Burbank Owner’s Guide
Demilec attic air sealing in Burbank typically runs between $1,500 and $3,800 installed, depending on attic footprint, access, and how far the existing foam has deteriorated. Most Burbank homes we service are completed in one visit, and we keep Demilec-compatible seal kits and touch-up foam on the truck. If you’re noticing dust in the house, a bedroom that runs five degrees warmer than the hallway, or a higher summer bill than your neighbors on the same street, the air seal at your attic floor has likely opened up.
Demilec’s open-cell and closed-cell spray foam both act as an air barrier, but the seal only works if the foam stayed bonded to the framing, the drywall, and every penetration. In Burbank, we see failures most often around recessed lights, ceiling fans, and the plumbing chases above bathrooms, exactly where the original installer cut corners or the foam was knocked loose during other work. We inspect those spots first because they’re where the money leaks out. Neil Ashford has spent nearly two decades tracing these exact failures in Burbank attics, and the pattern is consistent.
Which Demilec Models This Applies To
Demilec makes two product families that show up in Burbank attics. Heatlok HFO is the closed-cell line, and Sealection is the open-cell line. The compatibility question matters because the touch-up foam you choose has to match the existing application’s density and expansion rate. If someone sealed the attic floor with Heatlok HFO Pro and you patch with an open-cell kit meant for walls, the new foam won’t hold the same air barrier performance, and you’ll be back in the same spot next summer.
When we walk a Burbank attic, we look for the original spray tags on the foam, which list the product name, lot number, and install date. Demilec also stamps the foam color differently by line, closed-cell Heatlok typically reads as a dense off-white or cream, while Sealection is lighter and softer to the touch. That helps us identify what’s there without guessing. Warmline Insulation Co. is an independent service provider, we’re not affiliated with Demilec, but we install and repair their systems regularly, and we also stock compatible materials from Reflectix for radiant barrier top-ups in the same attics.
On the OEM versus aftermarket question: Demilec sells its own touch-up and repair kits, and for warranty-sensitive jobs we use those. For older systems where the original warranty lapsed years ago, we recommend a quality aftermarket polyurethane foam matched to the same density class. The honest difference is usually price and availability, not performance, provided you match the spec. We walk you through that decision before any work starts.
Signs Your Demilec Attic Air Sealing Is Failing
- A room that won’t hold temperature. When the attic floor seal opens, conditioned air from the living space escapes up into the attic, and that room runs hotter in summer and colder in winter than the rooms around it. This is the most common first sign Burbank homeowners report to us.
- A summer cooling bill that jumped without a rate change. Burbank’s July and August heat pushes attic temperatures past 130 degrees, and an opened air seal means your AC is effectively conditioning the attic. We see 15 to 30 percent bill swings from this alone.
- Dust or insulation particles drifting in the house. When the Demilec foam separates from the drywall, loose insulation and dust from the attic deck slip through the gap and settle on furniture, windowsills, and ceiling fans. You’ll notice it most in rooms directly under the attic hatch.
- A musty smell upstairs after rain. Failed air sealing lets attic air and moisture move both ways. In Burbank’s winter rain season, humid attic air condenses against the drywall and raises musty-smelling air into bedrooms. It’s often misdiagnosed as a roof leak.
- Rodent or pest activity in the attic. Rats and mice in Burbank squeeze through remarkably small gaps, and a broken air seal around vents or plumbing penetrations gives them an entry point. Droppings in the insulation near those areas tell us the seal has failed and the pest entry needs closing in the same repair.
Replacement Cost & What’s Included
For a standard Burbank single-story home, expect to spend $1,500 to $2,600 for partial re-sealing around failed penetrations, and $2,800 to $3,800 for a full Demilec attic floor re-seal that includes removal of loose debris and prep of all edges. The spread comes down to attic access, the amount of existing foam that needs cutting back, and how many penetrations, lights, fans, and plumbing stacks need resealing.
Every quote includes the labor, the Demilec-compatible foam, cleanup, and a written scope of the exact spots we sealed. We price the whole job upfront, before any work starts, so there’s no surprise line item at the end. All work is covered by our 90-Day Done Right Promise. If the seal doesn’t hold or a spot we missed opens up within 90 days, we come back and make it right at no charge.
DIY or Call Us?
What Burbank homeowners can safely check: the attic hatch weatherstripping, visible cracks around duct boots, and obvious daylight coming through at the eaves. Those are inspection steps, and they’ll tell you if the problem is real. What we caution against is climbing into a hot Burbank attic with a spray foam kit and trying to patch Demilec foam yourself. The two-part foam cures fast, off-ratio mixing is common in one-time kits, and if you spray over a loose or dirty substrate, the patch will fail. Plus, working in a 130-degree attic without proper ventilation isn’t a reasonable Saturday project.
If you’ve already confirmed the seal is failing, call (747) 837-5834. A live person answers 24/7, not a voicemail, and we’ll schedule a diagnostic visit. Most Demilec air sealing repairs in Burbank are done in a single visit.
FAQs
Demilec attic air sealing typically lasts 15 to 20 years in Burbank when installed correctly and left undisturbed, though sections around recessed lights and plumbing penetrations can fail sooner because those areas get physically disturbed by other work and by the thermal expansion of metal fixtures. High attic heat in summer accelerates the breakdown of foams that weren’t mixed at the proper ratio originally. If the original install was done correctly, the seal ages slowly. Call (747) 837-5834 for a free inspection if your home is approaching that age.
Yes, in most Burbank homes we repair the failed sections only, typically around penetrations, edges, and fixture boxes, and leave the intact Demilec foam in place. Full replacement is only needed when the foam has separated across large areas or was installed too thin to function as an air barrier. Our technicians will show you the failed areas in the attic photos before recommending scope.
Most Demilec attic air sealing repairs in Burbank take half a day to a full day, depending on the number of penetrations and the attic’s accessibility. We complete most jobs in a single visit, including prep and cleanup. Partial re-seals around a handful of penetrations often finish in under four hours.
Yes, our technicians carry Demilec-compatible open-cell and closed-cell touch-up foam, plus the tools to identify the existing product line in your Burbank attic, so most repairs happen the same day we diagnose the problem. We also stock Reflectix radiant barrier material for homes that need the attic’s reflective layer refreshed along with the air seal. Call (747) 837-5834 to confirm availability before we arrive.
Get Your Burbank Attic Sealed Right
If your Demilec attic air sealing has opened up, every week you wait is money going through the roof, and summers in Burbank don’t get cheaper. Call Warmline Insulation Co. at (747) 837-5834 for a free estimate. A live person answers 24/7. Ask about our $50 Off Any Repair Over $250, our $89 Seasonal Tune-Up, or the permanent 5% Senior and Veteran discount. We’ve been serving Burbank since 2011, and the work is backed by our 90-Day Done Right Promise. Good insulation shouldn’t be something you think about, that means it’s working.
Written by Neil Ashford, Owner, Warmline Insulation Co. at Warmline Insulation Co., serving Burbank and nearby areas.