Demilec Attic Insulation Nationwide | Walt’s Insulation

Demilec Attic Insulation: The Anaheim Owner’s Guide

If your Demilec spray foam attic insulation is failing, pulling away from rafters, or crumbling in Anaheim’s summer heat, we can match it and fix it, usually same-week. Installed replacement for Demilec-compatible open-cell or closed-cell foam in an Anaheim attic typically runs $1.50 to $3.50 per board foot, depending on depth and condition of the existing foam. Most owners notice the problem the same way: energy bills creeping up in July, a bedroom that won’t hold temperature, or visible dark spots and shrinking foam along the roofline.

Call (657) 214-8224

We’ve been working on Demilec-insulated attics across Anaheim since before Spray Polyurethane Foam became a buzzword. Walt Brenner started this company in 2000, and we’ve seen what Anaheim’s specific conditions, salt-tinged coastal air mixing with 90-degree inland heat, triple-digit attic temps in August, do to foam over time. It’s not always the foam’s fault. Sometimes it’s the original install. Either way, we know what we’re looking at when we climb the ladder.

Which Demilec Models This Applies To

Demilec makes two main product families you’re likely to find in an Anaheim attic: Sealection 500 (open-cell, half-pound foam) and Heatlok HFO (closed-cell, two-pound foam). Some older homes also have Demilec’s Airmetic or Polar Foam lines, but those are less common here. The compatibility question matters because open-cell and closed-cell behave completely differently when they fail, and you never want to patch one with the other.

Here’s the gotcha most people don’t know: you can’t just spray new closed-cell over degraded open-cell and call it done. The old foam has to be cut back to solid material, and the moisture trapped in the failed open-cell has to dry first, or you’re sealing the problem in. In Anaheim homes near the 5 and 91 freeways, we also see open-cell foam that’s absorbed years of subtle exhaust and attic dust, leaving it dark, brittle, and holding odors. We stock Demilec-compatible open-cell and closed-cell kits on our trucks, plus the aftermarket equivalents that match Demilec’s density specs within 0.1 pound per cubic foot for open-cell and 0.2 for closed-cell. That tolerance matters if you want the r-value you’re paying for.

One more thing: if your attic has a Demilec label or the original installer left paperwork, the product name is printed right on the warranty card. If not, we can identify open-cell versus closed-cell by touch and density in about thirty seconds. It’s not rocket science, but you’d be surprised how many outfits guess wrong.

Signs Your Demilec Attic Insulation Is Failing

• Foam pulling away from roof decking. This is the most common failure we see in Anaheim, especially in tract homes built during the 2000s foam boom. Open-cell foam that was sprayed too thin or mixed at the wrong temperature loses adhesion over time, and gravity does the rest. You’ll see gaps at the top of the rafters where the foam has separated from the wood.
• Dark spots or a musty smell. Closed-cell foam doesn’t breathe. If a roof leak developed after install, water gets trapped between the foam and the sheathing, and you won’t know until the smell works its way down through ceiling fixtures. We’ve pulled foam in Anaheim Hills that looked fine from below and was black with mold against the decking.
• Brittle, chalky foam at the attic floor line. Extreme heat cycles, like what a vented Anaheim attic hits every summer, can degrade the foam’s surface. It starts to powder and flake. You’ll see dust settling on boxes or stored items up there.
• Uneven indoor temperatures upstairs. One bedroom fine, another ten degrees warmer. That’s usually a sign the foam has thinned or pulled back in one section of the roofline. The overall attic temp stays manageable, but that one room feels it first.
• Higher July and August cooling bills without a change in usage. Not dramatic, just a steady creep of 10 to 15 percent. That tracks with foam losing r-value as it cracks and shrinks, letting radiant heat push through the roofline into the living space.

Replacement Cost & What’s Included

For an Anaheim attic with Demilec-compatible foam replacement or repair, here’s what we quote:

• Spot repair of pulled-away foam: $400-$900 depending on square footage and whether we need to remove and dispose of failed foam first.
• Full attic re-foam with open-cell (Sealection-type): $1.50-$2.25 per board foot, most Anaheim attics landing between $2,800 and $5,500 installed.
• Full attic re-foam with closed-cell (Heatlok-type): $2.75-$3.50 per board foot, typically $5,000-$9,000 installed depending on depth and roof pitch.
• Removal of failed foam only: $1.00-$1.75 per square foot of foam removed, bagged, and hauled.

The spread between those numbers comes down to three things: how much old foam has to come out, whether your truss spacing gives us clean access, and whether we’re matching existing depth or starting fresh. Every quote is line-itemed. You’ll see exactly what the foam costs, what labor costs, and what disposal costs. No “miscellaneous.” And every job is covered by our Done Right Promise, lifetime workmanship. If it’s not done right, we make it right, no runaround. That’s the whole point of calling the one down the road instead of a franchise with an 800 number.

DIY or Call Us?

Some things in an attic you can handle yourself. Checking for visible gaps, taking photos, feeling for drafts around can lights, that’s all fair game. But removing failed spray foam is not a weekend project. It’s dusty, it’s sticky, and cutting it back to solid material takes a respirator, not a dust mask from the hardware store. Closed-cell foam is also surprisingly tough; you’ll dull utility blades fast and risk gouging the roof decking.

Spraying new foam yourself? We won’t tell you not to. But the two-part kits at big-box stores rarely hit the density or expansion rate that Demilec spec’d for your attic, and if you get the mixing temperature wrong on an Anaheim summer afternoon, you’ll be scraping half-cured foam off your rafters. We get called out to fix DIY foam jobs at least once a month. If you’d rather skip straight to it being right, call (657) 214-8224. Estimates are free, and if you have a written quote from another company, bring it. We’ll give you a free second opinion.

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