Demilec Wall Insulation in Leander: What to Know First
We provide independent Demilec wall insulation service in Leander, typically scheduling within 48 hours and completing most jobs in a single day. Most Demilec injection foam and drill-and-fill wall projects in Leander run between $2,800 and $5,400 for a standard 2,000-square-foot home, with a written price delivered before any work starts. This page is for homeowners who already have Demilec product in their walls and need to add, repair, or replace it - whether the original install settled, the contractor skipped air sealing, or you’re finishing a garage or addition and want to match the existing envelope. Call (737) 252-7159 for a free estimate with a written scope and warranty.
How Demilec Products Fail - and How We Fix Them
- Heatlok HFO High Lift shrinkage in Leander’s 140°F attic-adjacent wall cavities. The HFO blowing agent can lose expansion volume in repeated summer heat cycles, leaving a 15-20% gap at the top plate in second-story walls. We see this regularly in Crystal Falls and Travisso homes where south-facing walls bake from June through September. We remove the compromised lift and re-inject with corrected substrate temperature and lift height, then verify with thermal imaging.
- Heatlok Soya settled density in walls with active air leaks. When the original installer blew soy-based open-cell foam over unsealed top plates or electrical penetrations, the escaping conditioned air pulls the foam matrix inward over 3-5 years. The wall reads fine on a surface thermometer but shows 2.5+ ACH50 contribution on a blower-door test. We seal first - top plates, boxes, and penetrations - then drill and fill with matched density, and we publish the before-and-after CFM50 so you see the difference.
- Demilec 500 wall shrinkage at stud bays with elevated moisture content. In Leander’s spring buildup season, when exterior sheathing hits 18%+ moisture from humidity swings, the 500 series can pull away from studs as it cures. We moisture-map the sheathing with a pinned meter, let it dry to 14% or below, then re-apply with corrected mix ratio and temperature. No guesswork; the meter reading goes in your written report.
- Incompatible retrofit where Demilec open-cell was injected over existing fiberglass batt without removal. The trapped batt creates a double vapor retarder, and in Leander’s mixed-humidity climate, that sandwich grows mold in 18-36 months. We scope the cavity with a borescope, pull the batt if it’s there, then sequence the fill correctly: air seal, then insulate. “Seal the envelope first. Then fill it.”
- Heatlok XT rigid board delamination in exterior wall retrofits. When XT boards were cut and wedged into existing stud bays without adhesive or mechanical fastening, thermal cycling pops them loose. We find this in 2018-2020 Leander builds where speed beat sequencing. We remove the loose boards, re-cut with proper relief gaps, fasten with compatible adhesive, and fill the perimeter with low-expansion sealant so the board stays put through the next decade of temperature swings.
Our Demilec Wall Insulation Process
- 1
Call and scope. A live person answers, 24/7. We ask about the original install date, the Demilec series if you know it, and what you’re experiencing - cold walls, high bills, settled spots, or a remodel. We schedule a site visit, usually within 48 hours.
- 2
Diagnostics with documentation. Wes or a trained tech arrives uniformed and background-checked. We run a blower-door test - a pressurization reading that shows, in one number, how much air your building envelope is losing. We borescope wall cavities, moisture-map sheathing, and thermal-scan for gaps. Every finding gets a photo; every photo goes in your record.
- 3
Written price before any work starts. Under Haven Standard Clause 1, you get a flat price, written scope, and written warranty before anyone lifts a tool. No surprises, no “we found more once we opened it up.” If you have a competing quote, we offer a Free Second Opinion - we’ll read it with you.
- 4
Air sealing first, then insulation. We seal top plates, electrical boxes, plumbing penetrations, and any leaks the blower-door test identified. Only then do we proceed with Demilec injection foam, drill-and-fill, or board installation. The sequence matters more than the product.
- 5
Install with verification. For injection jobs, we verify lift height and density with a calibrated ruler card in every tenth bay. For board jobs, we check fastener spacing and gap seal. We run a post-work blower-door test and compare to the pre-work number.
- 6
Cleanup and documented handoff. You get a Documented Photo Record, the before-and-after blower-door readings, and your written warranty under the 365-Day Done Right Promise. If it’s not done right, we make it right.
Before
AfterWhat Demilec Wall Insulation Costs in Leander
| Scenario | Typical Range | What Moves the Price |
|---|---|---|
| Drill-and-fill Demilec open-cell, 1-story home (1,800 sq ft) | $2,800 - $3,800 | Wall cavity depth, number of penetrations to seal first, access (finished interior vs. exterior siding removal) |
| Injection foam retrofit, 2-story home (2,400 sq ft) | $4,200 - $5,400 | Lift height required, moisture remediation needs, whether existing material must be removed |
| Interior wall soundproofing with Demilec open-cell | $1,800 - $2,800 | Number of walls, electrical box sealing, whether resilient channel is involved |
| Garage or addition to match existing Demilec envelope | $1,400 - $2,600 | Matching series and density, air sealing integration with main house |
| Removal and replacement of failed Demilec fill | $3,200 - $5,800 | Extent of failure, mold remediation if present, sheathing repair needs |
These are real ranges for Leander homes we’ve worked on, not teaser rates. The written price you receive accounts for your specific wall assembly, access conditions, and what the blower-door test reveals. Call (737) 252-7159 for a free estimate - the scope and price come in writing before any work starts.
Why Leander Homeowners Call Topside Attic Insulation Leander for Demilec Work
We’ve sealed and insulated 9,000+ homes since 2016, and a growing share of our Leander calls are Demilec fixes - mostly from homeowners who watched the original installer skip the air sealing and wanted the job done in the right sequence. 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 training shows in how we sequence every Demilec job: seal first, verify with a number, then insulate. We’re also independent - we carry Owens Corning, Johns Manville, Knauf, Rockwool, CertainTeed, Icynene, Demilec, GreenFiber, and Reflectix - so if your walls need something other than what you have, we tell you straight rather than force a product match. The 365-Day Done Right Promise, the written price before work starts, and the documented photo record are non-negotiable on every job. A live person answers calls 24/7.
FAQs
Demilec’s product warranty covers manufacturing defects, not installation workmanship - and most original install warranties are 1-5 years from the contractor, not the manufacturer. As an independent Demilec service provider, we document our work with photos and blower-door readings, and our 365-Day Done Right Promise backs the installation. If you have a valid original warranty claim, we’ll help you identify whether the issue is product or install and advise accordingly. Call (737) 252-7159 and we’ll review your paperwork with you.
We source Demilec product directly through standard distribution channels, and for repairs or matches, we use the specified series - Heatlok HFO, Heatlok Soya, 500, or XT - with the correct A-side and B-side chemistry. When a Demilec line has been discontinued or a faster-cure equivalent makes sense for your job, we explain the substitution in writing before proceeding. No proprietary lock-in; just the right material for the assembly. For a written scope on your specific wall, call (737) 252-7159.
Repair is cheaper when the failure is localized - a settled top plate in a few bays, or shrinkage at one penetration. Removal and replacement is necessary when the cavity contains incompatible materials (fiberglass sandwich), mold, or moisture-compromised foam that will keep failing. We borescope first and tell you which category you’re in before quoting either approach. Estimates are free; call (737) 252-7159.
Most jobs are completed in one day; two days if we’re removing failed material and letting sheathing dry. We typically schedule within 48 hours of your call, and we don’t use callback windows measured in business days - a live person answers 24/7. For urgent cases, like a remodel with drywall scheduled, we work to your timeline. Call (737) 252-7159 to check current availability.
The foam may be fine, but the envelope wasn’t sealed first. In Leander’s climate, a 2 ACH50 house with good R-value in the walls still loses conditioned air through top plates and boxes, creating convective loops that read as “cold walls” on a thermostat even when the insulation itself is intact. We fix this by running a blower-door test to find the leaks, sealing them, and re-testing so you see the number change. Call (737) 252-7159 for a diagnostic - estimates are free.
Written by Wes Okafor, Owner, Topside Attic Insulation Leander at Topside Attic Insulation Leander, serving Leander and nearby areas.