Demilec Blown-In Insulation in Leander: What to Know First
We provide independent Demilec blown-in insulation service in Leander, typically completing attic jobs in one day and dense-pack wall work in two. Most homeowners receive a written price before we unload a single hose, and that price includes air sealing, material, and the blower-door verification that proves the work. Call (737) 252-7159 for a free estimate with no callback window.
This page is for Leander homeowners who already have Demilec insulation in their attic or walls and need service, top-up, or replacement - whether your home is in Crystal Falls, Mason Hills, or one of the 2018-2022 builds off Ronald Reagan Boulevard where Demilec open-cell foam was commonly paired with blown-in fiberglass cap.
How Demilec Products Fail - and How We Fix Them
- Demilec SEALECTION 500 open-cell foam shrinkage in hot attics. In Leander, attic temperatures reach 140°F for weeks each summer. SEALECTION 500 can pull away from rafter faces or top plates, creating convection channels that render any overlying blown-in insulation ineffective. We cut back the failed foam, seal the gap with compatible acrylic latex, then blow new material to the correct depth verified with a calibrated ruler card.
- Demilec Heatlok HFO High Lift overspray onto blown-in cellulose. When spray foam installers miss the poly sheeting, HFO residue bonds to cellulose fibers and creates a hydrophobic crust that traps moisture. We’ve found this in Leander’s Travisso neighborhood on homes where subsequent contractors blew cellulose over existing foam without inspection. We remove the contaminated layer, verify the substrate is dry with a moisture meter, then install fresh blown-in fiberglass to avoid re-chemical interaction.
- Demilec AgriThane agricultural-grade foam degradation in crawl spaces. Some Leander homes built during the 2020-2021 supply shortage received AgriThane below grade, a product never intended for residential envelopes. It off-gasses and powders when exposed to the alkaline soils of the Blackland Prairie. We encapsulate the failing foam, install a proper vapor barrier, then dense-pack the rim joist with blown-in mineral wool that won’t react with soil chemistry.
- Demilec Eco-Pur 365 blown-in top-up incompatibility with existing fiberglass. Eco-Pur 365 is a hydroxyl-functional polymer that can off-gas amines for 72 hours post-installation. When a previous contractor blew it directly over old fiberglass without a separation layer, the amines degrade the fiberglass binder. We strip to the deck, install a breathable mesh barrier, then sequence the new blow correctly: seal first, then fill it.
- Demilec Heatlok XT closed-cell thermal drift in wall cavities. Heatlok XT relies on HFO blowing agents that can partially escape through imperfect wall sheathing, dropping the effective R-value from R-7 per inch toward R-5.5 over five to seven years. In Leander’s wind-exposed hills, this shows up as cold spots on FLIR scans during our January energy audits. We dense-pack the cavity with blown-in cellulose to restore the assembly R-value without disturbing the existing foam.
Our Demilec Blown-In Insulation Process
- 1
Call and schedule. A live person answers 24/7. We book a window, text you when the technician is en route, and send a named technician - not a rotating subcontractor.
- 2
Attic or wall inspection with documentation. We photograph the existing Demilec product, identify the series and install date if possible, and run a blower-door test - a pressurization reading that shows, in one number, how much air your building envelope is losing. You get the photo record before we leave.
- 3
Air sealing before any insulation touches the space. Top plates, can lights, plumbing penetrations, and electrical chases get sealed with appropriate caulk or gasket. We will never blow insulation over an unsealed attic floor. Seal the envelope first. Then fill it.
- 4
Material selection and written price. We specify the blown-in product - cellulose, fiberglass, or mineral wool - based on your existing Demilec type, not what we have on the truck. You get a flat price, written scope, and written warranty before anyone lifts a tool. Haven Standard Clause 1.
- 5
Installation with depth verification. We blow to the specified density, check depth with a calibrated ruler card at minimum five locations per 1,000 square feet, and photograph the completed work.
- 6
Post-install blower-door test and written report. On applicable jobs, we run the blower door again and publish the before-and-after numbers so you can verify the air-sealing result. The documented photo record and written report are delivered before payment is requested.
Before
AfterWhat Demilec Blown-In Insulation Costs in Leander
Most attic top-up jobs in a Leander home of 2,000-2,500 square feet run between $1,800 and $3,400, including air sealing and material. Dense-pack wall work on a similar footprint typically falls between $2,600 and $4,800, depending on cavity accessibility and whether we need to remove degraded Demilec foam first.
| Scenario | Typical Range |
|---|---|
| Attic blown-in top-up over intact Demilec foam | $1,800 - $3,400 |
| Attic removal + replacement of failed Demilec/blown-in hybrid | $3,200 - $5,600 |
| Dense-pack wall insulation (per 1,000 sq ft of wall) | $2,600 - $4,800 |
| Crawl space encapsulation + rim joist dense-pack after AgriThane failure | $4,000 - $7,200 |
What moves the price: accessibility (steep roof pitch, limited attic hatch size), extent of existing material removal, and whether the blower-door test reveals hidden bypasses that need sealing. We do not upsell; we document what we found and let you decide.
Call (737) 252-7159 for a written estimate - estimates are free, and we provide a Free Second Opinion on any competing written quote you bring us.
Why Leander Homeowners Call Topside Attic Insulation Leander for Demilec Work
We’ve sealed and insulated over 9,000 homes since 2016, and a growing share of our Leander calls involve Demilec products installed during the 2018-2022 construction surge. Wes Okafor learned blower-door diagnostics and air-sealing sequencing at Triton College in River Grove, Illinois, before he ever picked up a blowing machine, and that sequencing discipline - seal first, verify with numbers, then insulate - is what separates a performance result from a material dump.
We are an independent Demilec service provider, not affiliated with or authorized by Demilec. That independence matters: we specify from Owens Corning, Johns Manville, Knauf, Rockwool, CertainTeed, Icynene, Demilec, GreenFiber, and Reflectix based on what your assembly actually needs, not what a single brand’s rep is pushing this quarter. Every job carries the 365-Day Done Right Promise, backed by a written scope and written warranty delivered before work starts.
FAQs
No - Demilec’s residential warranty covers product defect, not who installs or services it, provided the work does not alter the original application method. As an independent Demilec service provider, we document the existing product condition with photos before touching anything, so there’s a clear baseline if a defect claim ever arises. Call (737) 252-7159 if you want us to review your warranty paperwork during the estimate.
Most attic jobs finish in one day; dense-pack wall work or crawl space remediation after AgriThane failure typically takes two. We don’t schedule by the job - we schedule by the scope, and the written scope includes the hour estimate before anyone starts. If we find additional air leaks during the blower-door test, we show you the reading and adjust the scope in writing, not on the fly.
Repair is cheaper when the failure is localized - shrinkage at rafter edges, overspray on a single bay, or a thin top-up needed to restore depth. Replacement becomes the better value when the product has degraded across the assembly, when incompatible materials have been layered, or when the existing R-value has drifted below 50% of specification. We give you both numbers in the written estimate and let you decide. Call (737) 252-7159 for the exact math on your home.
We don’t stock Demilec proprietary blowing agents or foam resins - those are restricted to certified applicators with specific equipment. For blown-in insulation work, we use quality aftermarket materials from the same suppliers Demilec draws from: Owens Corning, Johns Manville, Knauf, and others. When we’re sealing around existing Demilec foam, we specify compatible acrylic latex or vapor-retarding primer based on the product’s published chemical compatibility data, not guesswork.
We answer calls 24/7 and typically schedule estimates within 48 hours, with same-day availability for active moisture intrusion or exposed electrical in the attic. True insulation emergencies are rare - most Demilec failures develop over seasons, not hours - but if you’ve got water coming through a compromised assembly, we treat it as urgent. Call (737) 252-7159 and a live person will book you.
Written by Wes Okafor, Owner, Topside Attic Insulation Leander at Topside Attic Insulation Leander, serving Leander and nearby areas.