Demilec Attic Insulation Nationwide

Demilec Attic Insulation: The Irvine Owner’s Guide

If you have Demilec spray foam insulation in your Irvine attic that’s underperforming, degrading, or was installed wrong, we can fix it. Installed replacement and remediation work for Demilec foam in Irvine typically runs between $1,200 and $4,800 depending on attic square footage, foam depth, and whether we’re doing a full removal or a targeted repair. We keep Demilec-compatible materials on hand and can usually schedule an assessment within 48 hours. Most Irvine homeowners discover the problem through a specific frustration: rooms that won’t hold temperature, a spike in summer cooling bills, or that unmistakable chemical smell that never quite dissipated after the original install. Neil Ashford and our crew have walked into enough Irvine attics to know exactly what failed and why within ten minutes of opening the hatch.

Call (949) 832-7835

Key takeaways:

• We’re an independent insulation contractor, not affiliated with Demilec, and we service all Demilec open-cell and closed-cell foam lines.
• Typical Irvine attic foam remediation runs $1,200-$4,800 installed, with free estimates and upfront pricing.
• We carry Demilec-compatible repair materials on the truck, so most jobs are done in a single visit.
• All work carries our 90-Day Done Right Promise: if it’s not right, we make it right.

Which Demilec Models This Applies To

Demilec makes two broad spray foam families you’ll find in Irvine attics: open-cell (Heatlok HFO, Seallection 500) and closed-cell (Sealection Agribalance, Heatlok Soya). The compatibility gotcha most homeowners never learn is that the two types fail differently. Open-cell foam absorbs moisture and can slump away from roof decking over time, while closed-cell foam can separate from the substrate if the original installer sprayed onto a dusty or hot surface. If your home was built during Irvine’s big expansion years in the 1980s and 1990s and later had foam retrofitted, we typically find separation at the roofline where the decking hits the top plates.

We’re an independent contractor, so we’re not beholden to one manufacturer’s line. That means we can honestly assess whether an OEM Demilec product or a quality equivalent makes more sense for your repair. In practice, for most Irvine attic repairs we use Demilec-compatible materials that match the existing foam’s chemical family, simply because patching open-cell with a different open-cell avoids compatibility problems at the seam. If you’re not sure which product is in your attic, pull a small piece and check for color (Heatlock is typically lighter tan; Agribalance tends toward greenish) or just have us take a look during the free estimate.

Signs Your Demilec Attic Insulation Is Failing

• Rooms directly under the attic are 4-6° warmer than the rest of the house in summer. Foam that has separated from roof decking creates gaps where Irvine’s July sun cooks the attic and the heat finds the path of least resistance down through your ceiling.
• Your cooling bill jumped 15-20% year over year with no change in usage. Demilec foam is rated for its air-sealing ability, not just R-value. Once it pulls away from the decking, you lose the air seal and the thermal barrier at the same time, and your AC works harder every afternoon from May through October.
• You can smell a faint musty or chemical odor near the attic hatch. Open-cell foam that absorbed moisture from a roof leak or Irvine’s coastal humidity will hold that moisture against wood framing, accelerating both smell and rot.
• Foam visible at the roofline looks shrunken, cracked, or pulled back from the wood. This is the clearest visual sign. In Irvine’s climate, UV exposure at roof vents and any gable openings degrades exposed foam faster than the rest of the attic.
• You hear more outside noise than you used to. Demilec open-cell is a good sound damper. When it thins or slumps, street noise from Culver or the 405 filters in more noticeably, especially in Woodbridge and Northwood homes near major roads.

Replacement Cost & What’s Included

Here’s what installed Demilec attic foam repair and full replacement costs in Irvine, based on the work we’ve done across University Park, Turtle Rock, and Westpark:

• Localized repair (patching separated or slumping sections): $1,200-$2,200
• Partial attic remediation (remove failing sections, re-spray, and re-seal): $2,200-$3,800
• Full removal and replacement of a typical 1,200-1,800 sq. ft. Irvine attic: $3,800-$4,800+

Every quote includes removal of compromised material where needed, surface prep, new foam application to match the existing Demilec chemistry, and cleanup. Our pricing is upfront, not an estimate that mysteriously doubles by day two. Most Irvine attic jobs wrap in one visit. And because we’ve been doing this since 2011, we back every foam repair with our 90-Day Done Right Promise in writing.

DIY or Call Us?

What you can safely do: visually inspect. Open your attic hatch, shine a light at the roofline, and look for foam that’s pulled away from the wood, discolored, or missing in patches. Snap a photo and send it to us before you even schedule. What you should not do: attempt to re-spray, scrape, or patch Demilec foam yourself. Spray foam chemicals require proper PPE and mixing, and the materials set fast. A botched DIY patch usually creates a bigger void than the original gap, and you’ll be paying us to undo it before we can redo it correctly.

If the foam is failing, call (949) 832-7835. A live person answers around the clock, we’ll get someone to your Irvine home quickly, and we’ll tell you what’s wrong and what it costs before any work begins.

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