Demilec Attic Cleaning & Rodent Proofing Nationwide | Walt’s Insulation

Demilec Attic Cleaning & Rodent Proofing in Santa Monica: What to Know First

We provide independent Demilec attic cleaning and rodent proofing in Santa Monica, typically completing most cleanouts and exclusion work within one to two days depending on attic size and the extent of rodent damage. Pricing for a Demilec attic restoration in Santa Monica generally runs between $1,800 and $4,500, covering removal of contaminated insulation, sanitizing, air sealing, and new blown-in or spray foam where needed. If you own a Demilec spray foam home and you’ve heard scratching or noticed droppings, call (424) 396-5828 and a live person answers, day or night.

Call (424) 396-5828

This page is written for Santa Monica homeowners who have Demilec insulation in their attics and need it cleaned, sanitized, and sealed against rodents. We’re Walt’s Insulation, locally owned and operated since 2000, and as an independent Demilec service provider we work on these systems regularly without being tied to any manufacturer’s script.

How Demilec Products Fail, and How We Fix Them

• Open-cell foam (Demilec Sealection 500) absorbs rodent urine and odor. Demilec’s open-cell Sealection 500 is a common sight in Santa Monica attics where homeowners wanted breathable insulation. The problem is that its sponge-like cell structure soaks up rodent urine, nesting oils, and moisture from the marine air. We remove contaminated sections, sanitize the deck and remaining foam with an enzyme treatment, and reapply fresh foam or switch to a closed-cell product depending on moisture exposure.
• Closed-cell Demilec (Heatlok HFO Pro) hides rat burrows until the damage is extensive. Rodents carve tunnels through closed-cell foam slowly, and because Heatlok HFO Pro is rigid and dense, homeowners often don’t realize rats have been living in it until odor or electrical damage shows up. On these jobs we map the tunnel network, cut out compromised foam, and install galvanized steel exclusion at every entry point before reinsulating. A rat can’t chew through steel mesh the way it chews through foam.
• Demilec foam applied over old fiberglass creates a two-layer rodent highway. In many older Santa Monica bungalows near Montana Avenue, we find Demilec foam sprayed directly over existing fiberglass batts. Rodents love the fuzzy layer underneath the foam because it’s warm, dry, and easy to tunnel through. The fix is a full cleanout down to the deck, then one continuous layer of new foam or blown-in insulation with no mixed materials for rodents to exploit.
• Improperly cured Demilec foam off-gasses and flakes. When Demilec’s two-part foam isn’t mixed at the right temperature or ratio, it never fully cures. The result is a chalky, crumbly foam that sheds particles into the attic and sometimes into the living space below. We see this in Santa Monica homes where a previous contractor sprayed in cold or damp conditions, which happens more than it should near the coast. We remove the unstable foam, verify the substrate is dry, and reapply correctly.
• Rodent entry points around plumbing stacks and conduit are rarely sealed on original Demilec installs. This is less a Demilec flaw than an installation gap, but it shows up on nearly every rodent job we do. Pipes, vents, and wiring penetrations get foamed on the visible side but left open above the foam line where rats squeeze through. We seal every penetration with steel wool, hardware cloth, and a pest-block expanding foam rated for exclusion work, not just insulation.

Our Demilec Attic Cleaning & Rodent Proofing Process

1. 1
   We inspect and document everything. We walk the attic, map rodent paths, identify entry points, and assess the condition of your Demilec foam. You get photos and a straight answer about what’s salvageable and what isn’t.
2. 2
   We trap and exclude before we clean. You don’t want us to clean the attic while the rats are still living in it. We seal exterior entry points, set traps where needed, and verify activity has stopped before moving inside.
3. 3
   We remove contaminated insulation. This means bagging and HEPA-vacuuming all rodent-soiled Demilec foam, fiberglass, or blown-in material down to the deck. Rodent droppings and urine-soaked insulation are a health issue, and half-measures just leave odor behind.
4. 4
   We sanitize and deodorize. We apply an enzyme-based disinfectant to the decking, joists, and any remaining foam. This kills bacteria and breaks down the pheromone trails that attract new rodents.
5. 5
   We air seal and restore the insulation. Every gap, crack, and penetration gets sealed before we reinstall insulation. Depending on your home, we either reapply Demilec foam, install blown-in fiberglass from Owens Corning or Knauf, or use a hybrid approach that fits the Santa Monica climate.
6. 6
   We walk you through the finished job. You see the attic before you pay. Every job is backed by our Done Right Promise for life.

What Demilec Attic Cleaning & Rodent Proofing Costs in Santa Monica

Here’s what we quote on typical Demilec attic restoration work in Santa Monica. Prices include labor, materials, and disposal.

• Full attic cleanout with Demilec foam removal: $1,800 to $3,200 for a typical 1,200 to 1,800 square foot attic.
• Rodent exclusion and sealing: $400 to $900 depending on how many entry points need steel mesh and foam sealing.
• Sanitizing and deodorizing after cleanout: $250 to $500, included in most full restoration quotes.
• Reinsulation with fresh Demilec foam or blown-in fiberglass: $2,500 to $6,000 depending on R-value and product choice.

What moves the price is attic accessibility, how much foam needs to come out, and whether we’re working around finished storage areas. We quote upfront and we don’t pad the bill mid-job. Call (424) 396-5828 for a free estimate, and if you have another written quote, bring it. We’ll give you a free second opinion.

Why Santa Monica Homeowners Call Walt’s Insulation for Demilec Work

We’ve been working Santa Monica attics since the early 2000s, from older bungalows near Montana Avenue to newer builds closer to the water. Walt Brenner grew up in San Antonio, learned the trade at St. Philip’s College, and has spent over two decades getting attics right the first time. He’ll tell you that’s a lot cheaper than fixing someone else’s shortcuts.

We’re the one down the road, and you can hold us to that. A live person answers our phone 24/7, not a voicemail tree. Our technicians are background-checked and uniformed, so you know who’s walking into your house. And every Demilec job, whether it’s a cleanout, a rodent exclusion, or a full attic restoration, carries our Done Right Promise for life. If it’s not done right, we make it right. Do it right once. Everything else is just a second invoice.

We also work with Reflectix radiant barrier and a full line of insulation from Owens Corning, Rockwool, Icynene, Johns Manville, CertainTeed, Demilec, Knauf, and GreenFiber, so if a different product fits your attic better after the cleanout, we’ll tell you straight.

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