Demilec Blown In Insulation in Dallas: What to Know First
We provide independent Demilec blown in insulation installation and removal across Dallas, with most attic jobs completed in a single day. The honest price posture is this: most Demilec blown in projects in Dallas run between $1,800 and $4,200 depending on square footage, current R-value, and whether we’re removing old material first. That written price is in your hand before any equipment comes off the truck.
This page is for Dallas homeowners who already own a home insulated with Demilec products, or who are researching Demilec blown in options before a decision. If you’re dealing with uneven coverage, drafty rooms, or an attic that never holds temperature, call (940) 748-1726 and you’ll get a live person, not a voicemail.
How Demilec Products Fail – and How We Fix Them
- HeatSeal 500 open-cell settling in older Dallas attics. Demilec’s HeatSeal line was popular in North Texas homes built during the 2005 to 2015 boom. The problem we see most often is material that was sprayed too thin by the original installer, then settled over a decade of Dallas heat and humidity cycles. R-value drops from a promised R-38 to something closer to R-22 or R-25. The fix is a full removal of the failed material and a blown in installation at the correct depth for the R-value the house actually needs, not what the builder claimed.
- Sealection 500 shrinkage around recessed lights and junction boxes. Sealection 500 is a closed-cell spray foam that Demilec positioned as a one-coat air barrier. But around recessed can lights, exhaust fan housings, and junction boxes, we see shrinkage gaps where the foam pulled away from the metal. Those gaps become thermal bypasses, and in a Dallas August, that means conditioned air leaking straight into the attic. Our fix is mechanical: we don’t just blow new insulation over the gaps. We air-seal those penetrations first with the right sealant, then blow in the insulation to the target R-value.
- Demilec AgriFoam open-cell used in a residential retrofit that wasn’t rated for it. We’ve found AgriFoam in Dallas homes where a contractor used what was on hand. AgriFoam was engineered for agricultural buildings and pole barns, not conditioned residential attics. The symptom owners notice is a persistent musty odor and higher humidity in the living space. We remove the AgriFoam and replace it with a residential blown in product that’s actually specified for the space. This one’s more common than it should be.
- Heatlok HFO High Lift off-ratio application leaving sticky patches. Demilec’s Heatlok HFO line uses a hydrofluoroolefin blowing agent, which is fine when applied correctly. But if the A and B sides weren’t heated to the right temperature during application, the material never fully cures. Homeowners find sticky, tacky spots in the attic that gather dust and never harden. You can’t blow insulation over that. The failed material has to come out, the framing cleaned, and the job redone properly.
- Closed-cell Demilec foam trapping moisture against roof decking in vented attics. Dallas humidity is relentless, and when a closed-cell Demilec product gets applied to the underside of a roof deck in an attic that was originally designed to be vented, the result is trapped moisture. That’s not a Demilec defect as much as an application mismatch, but the homeowner suffers either way: peeling decking, mold on the sheathing, and insulation that’s now compromised. We remove the closed-cell, restore the ventilation path, and switch to a blown in product that works with the attic’s original design.
Our Demilec Blown In Insulation Process
Every Demilec job we do in Dallas follows the same sequence, and it starts before we touch the attic:
- 1
Call and schedule. A live person answers at (940) 748-1726. We set a window, and our techs arrive inside it. Uniformed, background-checked, and ready to look at the attic, not just hand over a brochure.
- 2
Attic assessment and blower-door diagnostic. We measure the current R-value in multiple spots, check for air leaks, and run a blower-door test when the job calls for it. We’re looking for exactly where the house is losing conditioned air, not just how much insulation is up there.
- 3
Written price and scope. Before any work starts, we put the price in writing. That covers the specific Demilec material we’re removing, the replacement blown in product, target R-value, and cleanup. The number you approve is the number on the invoice.
- 4
Removal of failed Demilec material. We extract the old insulation, bag it, and clear the attic. We don’t blow new insulation over failing material. That’s how you get mold, odor, and the same problem again in two years.
- 5
Air sealing, then blown in installation. We seal penetrations, verify the ventilation path, and blow in the insulation at the specified depth. We check coverage as we go, not just at the end.
- 6
Final R-value verification and guarantee. We confirm the installed R-value and walk you through the job. Every Demilec blown in replacement we do carries the 365-Day Done Right Promise: if the work fails within a year, we come back at no charge. No argument, no invoice.
What Demilec Blown In Insulation Costs in Dallas
Here are the numbers we typically see on Demilec blown in jobs across Dallas. These are real ranges from work we’ve done in the area, not national averages:
- Full Demilec removal and blown in replacement, 1,500 sq ft attic: $2,800 to $4,200
- Blown in installation only, no removal, 1,200 sq ft attic: $1,400 to $2,100
- Partial repair, single room over a cold spot: $600 to $1,100
- Air sealing package added to any blown in job: $450 to $900
What moves the price: depth of removal needed, attic height and access, how much the old Demilec material weighs, and the target R-value for your house. Dallas energy codes call for R-38 to R-49 in most attics, and getting from R-25 to R-49 costs more than topping off a slightly low attic.
We don’t quote low and revise at the door. You get a written price before any work starts, and we’ll walk you through exactly what’s in it. Call (940) 748-1726 for a free estimate. We’ll come out, look at the attic, and give you a number you can rely on.
Why Dallas Homeowners Call Alden Insulation Dallas for Demilec Work
Demilec blown in problems are rarely just insulation problems. They’re air-sealing problems, ventilation problems, and sometimes moisture problems that the insulation made worse. Our techs have spent years in Dallas attics, and they know what a failed Demilec application looks like before they even climb the ladder. We install products from eight brands: Owens Corning, Johns Manville, Knauf, Rockwool, CertainTeed, Icynene, Demilec, and GreenFiber. If Demilec isn’t the right call for your house, we’ll tell you that and quote the product that is. We also service Reflectix radiant barrier systems when a Dallas attic needs a different approach.
Alden Insulation Dallas is part of the Garrison Partners family, independently owned and operated since 2002 and held to The Garrison Standard. That means written prices, written guarantees, and a crew that shows up inside the window it promised. The 365-Day Done Right Promise covers every job we do. If the work fails within a year, we return at no charge. That’s not a sales line. It’s the way we’ve operated since the start.
Bryce Holloway, our owner, built his name on blower-door diagnostics and getting the R-value right the first time. His line on the job is simple: get the R-value right, and the house takes care of the rest. That’s the standard behind every Demilec job we take in Dallas.
FAQs
Demilec’s material warranty typically covers product defects, not installation failures, and most blown in problems we see in Dallas are installation failures, not material defects. We’re an independent Demilec service provider, not an authorized installer, which means we can diagnose honestly without a manufacturer relationship coloring the recommendation. If your issue is a material defect, we’ll point you to the warranty path. If it’s an installation problem, the warranty won’t cover it, and we’ll quote the fix.
Sometimes, yes. If the failure is localized, like a cold spot over one room, we can remove just that section and re-blow it correctly. But if the material is settled, off-ratio, or holding moisture, blowing over it just traps the problem underneath. We’ll tell you which situation you have after the attic assessment, and the written price will reflect exactly what we’re doing. Call (940) 748-1726 and we’ll take a look.
Most assessments happen within 48 hours of the call, and installation is usually scheduled within a week, depending on the job size. If the failing insulation is causing a serious moisture or air quality issue, we’ll work you in sooner. Calls are answered by a live person around the clock, so you’ll never leave a message and wait to hear back.
If less than a quarter of the attic is affected, a section repair is usually cheaper. If the material has settled across the whole space or the original application was bad from the start, a full removal and replacement costs less over time because you’re not paying for a second repair in two years. We’ll show you both numbers and let you decide. That’s how written pricing works.
We remove failed Demilec spray foam as part of a blown in replacement, and we install Demilec blown in products where they fit the house. We don’t do spray foam installation. If your house needs spray foam, we’ll tell you that straight, but our work is blown in insulation, removal, and air sealing done right.
Contact Alden Insulation Dallas
If your Demilec blown in insulation isn’t doing its job in your Dallas home, call (940) 748-1726. You’ll get a straight answer, a written price, and a crew that knows exactly what it’s looking at. Estimates are free, and the guarantee on every job is in writing for 365 days.
Written by Bryce Holloway, Owner, Alden Insulation Dallas at Alden Insulation Dallas, serving Dallas and nearby areas.