Demilec Blown-In Insulation in New Braunfels: What to Know First
We provide independent Demilec blown-in insulation service in New Braunfels for homeowners whose existing Demilec system needs top-up, replacement, or integration with new blown-in material. Most jobs we schedule run same-week, and every one starts with a written price before any work starts - no exceptions. If you’re seeing settled cellulose below labeled R-value, thermal drift in your attic, or you’re preparing a home for sale and need the blower-door numbers documented, this page is for you. Call (830) 243-6352 and a live person will pick up, 24/7.
How Demilec Products Fail - and How We Fix Them
- Demilec SEALECTION AgriBalance settled below grade. The AgriBalance line, a water-blown open-cell spray foam sometimes used as an air-sealing substrate beneath blown-in top-ups in New Braunfels builds from 2012-2018, can shrink up to 3% over time in our heat-cycling climate. When it pulls away from top plates, your blown-in cellulose or fiberglass above it becomes a ventilated blanket rather than a thermal boundary. We cut back the failed AgriBalance, re-seal with compatible material, then blow new insulation to proper depth.
- Demilec Heatlok XT thermal bridging at truss heels. Heatlok XT, a medium-density closed-cell foam, was spec’d in some local production homes for rim-joist and heel-joint sealing before blown-in attic coverage. In New Braunfels, where summer attic temperatures exceed 140°F, we’ve found Heatlok XT can degrade at the foam-to-wood interface after 8-10 years, creating a hard-to-detect bypass. Our fix: remove the compromised section, treat the wood with compatible primer, and re-establish the air barrier before adding new blown-in material.
- Demilec 500 open-cell overspray contamination. The 500 series was occasionally used in quick-seal applications where blown-in was meant to follow. Overspray onto drywall ceilings or can-light housings creates a fire-safety issue - the 500 series is not rated for exposed interior use without thermal barrier. We scrape and document the contamination, install proper ignition barriers where code requires, then proceed with blown-in installation.
- Demilec Eco-Pur moisture retention in vented attics. Eco-Pur, a bio-based foam, can hold moisture if the attic ventilation ratio drops below 1:150 in our humid shoulder seasons. We’ve pulled Eco-Pur samples from River Road corridor homes that tested above 15% wood-moisture-equivalent. The fix isn’t more foam; it’s controlled ventilation, vapor-profile analysis, and replacement with blown-in material that doesn’t create an impermeable sandwich.
- Demilec HFO Pro series compatibility gaps with legacy blown-in. The newer HFO Pro line uses hydrofluoroolefin blowing agents with different cure chemistry than earlier Demilec products. When homeowners add blown-in top-ups without checking substrate compatibility, we find delamination at the foam-to-insulation interface. We test with a core sample, specify the correct bonding primer if needed, and blow new material only after the substrate is verified stable.
Our Demilec Blown-In Insulation Process
- 1
Call and scope. You call (830) 243-6352, a live person answers, and we book a site visit. We ask about your Demilec product line if you know it, the home’s age, and any prior insulation work.
- 2
Blower-door test and attic inspection. We run a pressurization diagnostic - a blower-door test that measures CFM50, or cubic feet of air leakage per minute at 50 pascals of pressure - before touching anything. We photograph existing Demilec foam condition, measure settled insulation depth, and mark air-bypass locations.
- 3
Written price and material spec. You get a flat price, written scope, and written warranty before anyone lifts a tool. Haven Standard Clause 1: no work starts without it. We specify Demilec-compatible or alternative material based on what we found.
- 4
Air sealing first, then insulation. We seal top plates, can lights, penetrations, and any compromised Demilec substrate. Only after the envelope is tight do we blow new cellulose, fiberglass, or dense-pack wall material.
- 5
Post-job blower-door test and documentation. We run the blower-door again, print your before-and-after numbers, and add the photo record to your file. The number on the blower-door printout tells you what the insulation did. Everything else is just talk.
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Cleanup and 365-Day Done Right Promise. We haul out debris, leave the attic cleaner than we found it, and activate your warranty. If it’s not done right, we make it right.
Before
AfterWhat Demilec Blown-In Insulation Costs in New Braunfels
Most attic top-up jobs in a New Braunfels home of 1,800-2,400 square feet run between $1,400 and $2,800, depending on existing Demilec substrate condition and target R-value. Demilec removal and replacement with new blown-in material, where the existing foam has failed, typically ranges $2,800 to $5,200. Dense-pack wall insulation in older New Braunfels homes with no existing cavity fill runs $3.50 to $5.50 per square foot of wall area.
What moves the price: accessibility (steep roof pitch, limited attic hatch size), extent of Demilec removal required, and whether we need to install baffles or ventilation corrections before blowing. We also service Reflectix and other brands, so if your home has mixed insulation systems, we’ll spec the most cost-effective path.
Bring us any written estimate - we offer a Free Second Opinion and will read it with you line by line. Call (830) 243-6352 for your written price.
Why New Braunfels Homeowners Call Topside Attic Insulation New Braunfels for Demilec Work
We’ve sealed and insulated over 9,000 homes since 2016, and a growing share of our New Braunfels calls involve Demilec products installed during the 2012-2018 building boom. Wes Okafor and our crew know the difference between AgriBalance shrinkage and Heatlok XT interface failure without guessing, and we publish blower-door numbers on every applicable job so you can verify the result. Our materials come from Owens Corning, Johns Manville, Knauf, Rockwool, CertainTeed, Icynene, Demilec, and GreenFiber - no proprietary lock-in means we specify what’s right for your house, not what moves a particular product line. Calls are answered by a live person 24/7, and every job closes with a Documented Photo Record.
FAQs
No, adding blown-in insulation over properly installed Demilec foam does not void the foam warranty, but modifying or removing the foam without manufacturer-approved methods can. As an independent Demilec service provider, we document substrate condition with photos before any modification and use compatible materials per Demilec’s published compatibility matrix. Call (830) 243-6352 if you need help reading your original warranty documents.
Most Demilec jobs in New Braunfels schedule within 3-5 business days, and emergency air-leak or moisture issues get same-week priority. We don’t do callback windows measured in business days - a live person answers (830) 243-6352 24/7 and books real appointments, not “we’ll call you back.”
Repair is cheaper when the Demilec substrate is structurally sound but has minor shrinkage or interface gaps - typically 40-60% less than full removal. Full removal and replacement makes sense when we find moisture damage, delamination exceeding 20% of surface area, or incompatible product layers that would compromise new blown-in performance. We give you both numbers in writing and let you decide. Call (830) 243-6352 for your free estimate.
We can source Demilec OEM material for repairs where compatibility is critical, though we often recommend quality aftermarket alternatives with equivalent or better performance specs at lower cost. We never imply manufacturer authorization - we’re an independent service provider - and we’ll show you the data sheet comparison before you decide.
You receive a written scope, written warranty, before-and-after blower-door printout on applicable jobs, and a Documented Photo Record of all work areas. We keep copies filed by address, which has come in useful when New Braunfels homeowners sell and the buyer’s inspector asks questions. Haven Standard: Have it in writing.
Written by Wes Okafor, Owner, Topside Attic Insulation New Braunfels at Topside Attic Insulation New Braunfels, serving New Braunfels and nearby areas.