Demilec Blown-In Insulation Nationwide | Walt’s Insulation

Demilec Blown-In Insulation in Santa Monica: What to Know First

We provide independent Demilec blown-in insulation service across Santa Monica, with most jobs completed same-day or next-day and pricing that runs $1.75-$3.50 per square foot depending on cavity depth, access, and whether we’re topping up existing Demilec foam or starting fresh. As an independent Demilec service provider, we’re not tied to the manufacturer’s install schedule or warranty desk, so you call us and a live person answers, day or night. This page is for homeowners in Santa Monica who own a Demilec-insulated home or are considering Demilec open-cell or closed-cell products and want straight answers about blown-in insulation compatibility, failure points, and what it honestly costs to fix. Call (424) 396-5828 and Walt Brenner or one of our crew will talk you through it.

Call (424) 396-5828

How Demilec Products Fail - and How We Fix Them

Demilec makes good foam. Heatlok HFO and Sealection 500 are the two lines we see most often in Santa Monica attics and walls, and each has its own way of misbehaving over time. Here’s what we actually find when we open things up.

• Heatlok HFO closed-cell shrinkage at the top plate. This is the one we see most on Santa Monica homes built between roughly 2010 and 2018. The foam pulls back from the top plate where wall meets attic floor, leaving a hairline gap that lets conditioned air bleed straight into the attic. In marine air like we get off the Pacific, that gap also wicks moisture. Our fix: blown-in cellulose or fiberglass dense-packed into that top-plate seam, then air-sealed. You don’t re-foam it. You fill it.
• Sealection 500 open-cell saturation from roof leaks. Open-cell foam is a sponge. A Santa Monica flat roof that’s been weeping for two seasons will soak the top three inches of Sealection 500 in the attic. Homeowners notice the musty smell before the energy bill moves. We cut out the saturated section, dry the cavity, and blow in fresh insulation after the roofer does their part. Blown-in fiberglass actually handles future minor dampness better than re-foaming the same spot.
• Uneven Demilec spray depth from original installs. Demilec’s own warranty specs call for a consistent 1-inch minimum closed-cell lift, but we regularly find attics with 3/4-inch in the bays and 2 inches at the ridge. That’s an installer problem, not a chemistry problem. Blown-in top-up over the thin spots brings the whole assembly back to a uniform R-value without tearing out good foam. In Santa Monica, we typically add blown-in cellulose over open-cell and fiberglass over closed-cell to hit R-38 attic code.
• Demilec foam around recessed lights and bath fans. Foam crews sometimes stop short around can lights because of heat clearance rules, then nobody comes back to seal the ring. Those gaps become little chimneys. We dense-pack blown-in fiberglass around the fixture housing with proper clearance maintained, then seal the ceiling plane. That one gap on a Santa Monica bungalow can cost you more than you’d think in marine-layer season when the house can’t dry out.
• Sun-exposed south-facing roof decks over Demilec attics. Santa Monica gets real sun on the south slope, and closed-cell Demilec can over-cure and get brittle underneath a hot roof deck over a decade. That brittleness shows up as fine cracking you can’t see from the hatch. Our techs check for surface fissures during the inspection, and if the foam is still structurally sound we blow a layer of cellulose over it to take the thermal brunt. If it’s shot, we remove and replace. Walt has been doing this long enough to know which one you’re looking at.

Our Demilec Blown-In Insulation Process

1. 1
   Call and talk to a person. You call (424) 396-5828, we answer. We ask what you’re seeing: drafts, hot rooms, high bills, a smell. That tells us whether we’re dealing with a Demilec failure or something else entirely.
2. 2
   Attic inspection with numbers. We measure your existing Demilec foam depth, check the top plates, probe for moisture, and photograph everything. You get the photos. No mystery quotes.
3. 3
   Straightforward pricing. We give you a written number before any work starts. Free second opinion on any written estimate you have from another company, and no trip charge if you’re in the county. $40 off any repair over $200.
4. 4
   The work itself. Whether we’re topping up thin Demilec, dense-packing the top plate, or removing saturated open-cell, we use blown-in cellulose or fiberglass that fits the job. Demilec foam and blown-in insulation work together when you match the materials right.
5. 5
   We test it. Thermal imaging before and after, plus a blower-door check on bigger jobs, so you can see the difference, not just take our word for it.
6. 6
   Done Right Promise. Every job is covered by our lifetime workmanship guarantee. If it’s not done right, we make it right. That’s Walt’s rule, not a promotion.

What Demilec Blown-In Insulation Costs in Santa Monica

Here’s what we charge in Santa Monica, and what moves the number:

• Blown-in cellulose top-up over existing Demilec foam: $1.75-$2.50 per square foot. Typical 1,200-square-foot attic runs $2,100-$3,000.
• Dense-pack blown-in fiberglass into Demilec top-plate gaps: $2.25-$3.00 per square foot of treated wall area. Most jobs are $600-$1,200 because the gap zone is small.
• Saturated Sealection 500 removal plus blown-in replacement: $3.50-$5.00 per square foot, depending on how much foam has to come out and disposal fees.
• Full attic blow after Demilec foam removal: $2.75-$3.75 per square foot, including air sealing the ceiling plane.

What moves the price in Santa Monica: flat roof vs. pitched, how much old foam has to come out, access through a small scuttle hole, and whether we’re working around stored belongings up there. We don’t charge extra for a live person on the phone at 2 a.m., and seniors and veterans always get 10% off. Call (424) 396-5828 for an exact quote. Estimates are free.

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

We’re the one down the road. Walt Brenner started this company in 2000, learned the trade at St. Philip’s College before heading west, and has been working Santa Monica attics since the early 2000s, from older bungalows near Montana Avenue to new builds closer to the water. Same crew, same trucks, same published address and license number. We’re not a franchise and not an 800 number.

The real reason people call us for Demilec work is this: we don’t sell you a product, we fix your house. If blown-in insulation is the right answer for your Demilec situation, that’s what we install. If it needs to work alongside Reflectix radiant barrier to knock down the summer heat gain, we’ll tell you that too. Every tech who walks through your door is background-checked and in uniform, and every job is covered by the Done Right Promise. Do it right once. Everything else is just a second invoice.

FAQs