Demilec Wall Insulation Nationwide | Walt’s Insulation

Demilec Wall Insulation in Fullerton: What to Know First

We independently install, service, and repair Demilec wall insulation throughout Fullerton, and most jobs are done within two to three days of your first call. Pricing is straightforward: you’ll pay for the actual work and materials, not a franchise overhead line item, and we’ll give you a firm number before any foam touches your walls. If you own a Demilec-insulated home in Fullerton and the walls aren’t performing the way they should, call us at (657) 216-9948 and a live person will answer, day or night.

Call (657) 216-9948

This page is for Fullerton homeowners who already have Demilec foam in their walls, or who are considering it for a retrofit, and want straight answers about how it behaves in our specific climate, what fails, what it costs to fix, and who in this town actually knows how to do the work right. Walt Brenner started this company in 2000, and we’ve been in and out of Fullerton homes ever since, from the ranch houses near the Arboretum to stucco tract builds on the west side.

How Demilec Products Fail - and How We Fix Them

Demilec makes solid foam products, but no insulation is immune to our Southern California heat cycles, our old stucco and plaster walls, and the occasional rodent that decides a wall cavity looks like a nice place to live. Here’s what we actually see in Fullerton homes:

• Sealection 500 shrinkage gaps along top plates. Sealection 500 is Demilec’s open-cell, water-blown foam, and in older Fullerton homes with little attic ventilation, we see it pull back from the top plate as it cures under extreme attic heat. That leaves a thin air channel at the top of the wall that lets conditioned air leak into the attic. We fix it by drilling access at the top plate, re-injecting the cavity, and air-sealing the transition.
• Heatlok HFO high R-value drift over time. Heatlok HFO is Demilec’s two-component closed-cell spray foam, and it’s a good product. But we’ve tested walls in Fullerton where the installed thickness didn’t match what the homeowner was told. Closed-cell foam loses R-value if it’s applied too thin in one pass or if the mix ratio is off. We verify installed depth with a probe and, when the R-value isn’t there, we add material or re-insulate the cavity properly.
• APX 2.0 rodent tunneling in exterior walls. Demilec’s APX 2.0 is used in a lot of new construction, but Fullerton’s roof rat population doesn’t care what brand of foam you have. We regularly find tunnels chewed through closed-cell foam where utility penetrations weren’t sealed. Our fix includes removing the damaged section, re-foaming, and installing proper exclusion at the penetration points so the problem doesn’t come back.
• Moisture trapping behind stucco on south-facing walls. Fullerton summers push a lot of heat into south- and west-facing stucco walls, and any moisture trapped behind closed-cell foam has nowhere to go. We see this most often with improperly flashed older homes. We inspect the wall assembly before adding or repairing foam, and we’ll recommend vapor-management changes before we seal the cavity.
• Proprietary HFO blowing agent off-gassing concerns. Some Demilec lines use HFO-based blowing agents that need ventilation during installation. If a previous contractor didn’t ventilate properly, homeowners sometimes report lingering odor months later. We test the cavity, and if the foam needs to come out, we do full extraction and replacement.

Our Demilec Wall Insulation Process

Here’s how a typical Demilec wall insulation job goes when you call Walt’s Insulation in Fullerton:

1. 1
   You call, a person answers. No answering service, no voicemail. We ask about your home, your walls, and what you’re seeing or feeling.
2. 2
   We inspect the wall cavity. We use a borescope through a small access hole to see what’s actually inside your walls. We’re checking foam type, density, gaps, moisture, and any pest damage.
3. 3
   We give you a written number. You’ll know the exact cost before any work starts. No vague estimates, no “we’ll see how it goes.” If you have a written estimate from another company, bring it in and we’ll give you a free second opinion.
4. 4
   We do the work. For drill-and-fill jobs, we drill clean access holes at each stud bay, inject the foam, and plug the holes. For larger spray applications, we mask and protect everything first.
5. 5
   We test and verify. We check density, depth, and coverage before we close up. If it’s not right, we fix it on the spot.
6. 6
   We stand behind it, forever. That’s the Done Right Promise. If it’s not done right, we make it right. No runaround, no fine print.

What Demilec Wall Insulation Costs in Fullerton

Here’s what Fullerton homeowners can expect to pay for Demilec wall insulation work, based on the jobs we’ve done in this city:

• Drill-and-fill injection foam, single wall: $900 – $1,800, depending on wall size and cavity condition
• Drill-and-fill injection foam, whole house (1,500 sq ft): $3,500 – $6,500
• Spray foam for new construction or open walls: $1.50 – $3.00 per board foot installed
• Interior wall soundproofing with Demilec open-cell foam: $1,800 – $4,000 for a typical bedroom or media wall
• Rodent damage repair and re-foam: $600 – $2,500, depending on how much cavity we have to chase

What moves the price: access (crawlspace vs. second story), how much old material has to come out, and whether we find damage we have to fix before we can insulate. Every estimate is itemized so you see exactly what you’re paying for. Call (657) 216-9948 and we’ll give you a real number, not a guess.

Why Fullerton Homeowners Call Walt’s Insulation for Demilec Work

We’ve been doing this in Fullerton since 2000, and we’re the one down the road, not an 800 number in another state. When you call, you get Walt Brenner or someone on his crew who actually knows Demilec foam, not a dispatcher reading from a script. We’re locally owned and owner-operated, with a published address and a license number you can look up. Our technicians are background-checked and uniformed, so you know exactly who’s at your door. And we install more than just Demilec. We work with Owens Corning, Rockwool, Johns Manville, Knauf, CertainTeed, Icynene, GreenFiber, and Reflectix, so if Demilec isn’t the right fit for your wall assembly, we’ll tell you and offer an alternative instead of forcing a product that doesn’t belong there.

Every job, every time, is covered by our lifetime workmanship guarantee. We do the job right the first time because we’re the ones who have to stand behind it. That’s not a slogan. That’s how we’ve stayed in business for over 25 years.

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