Demilec Spray Foam Insulation in Boerne: What to Know First
We provide independent Demilec spray foam insulation in Boerne, with most jobs scheduled within 48 hours and completed in a single visit. A written price lands before any work starts - that’s Haven Standard Clause 1 - and every applicable job closes with before-and-after blower-door numbers so you see the actual air-sealing result, not a promise. Most Demilec spray foam insulation jobs in Boerne run between $2,800 and $6,500 depending on cavity depth, foam type, and whether we’re treating a roof deck, rim joist, or garage ceiling. Call (830) 529-7780 for a free estimate and a written scope you can compare.
This page is for Boerne homeowners who have a Demilec open-cell or closed-cell foam system that needs attention - whether it’s shrinking at the stud bay, pulling away from a roof deck after a Hill Country humidity cycle, or simply not performing the way the original spec sheet suggested. We don’t sell new Demilec product; we diagnose, repair, supplement, and replace existing Demilec installations with the same rigor we apply to every envelope job.
How Demilec Products Fail - and How We Fix Them
- Heatlok HFO Pro closed-cell shrinkage at rim joists. The HFO blowing agent in newer Heatlok formulations can react unpredictably with moisture-laden framing in Boerne’s spring humidity, causing the foam to pull back from sill plates and create thermal bypasses. We cut out the compromised lift, dry the substrate with targeted airflow, and reapply a compatible closed-cell layer - then run a blower-door test to confirm the rim joist zone isn’t leaking.
- Sealection 500 open-cell overspray and density collapse in vaulted ceilings. Sealection 500 is a light-density open-cell that demands precise substrate temperature; in unconditioned Boerne attics during July, the foam can slump before full rise, leaving thin spots that read fine on infrared but fail at R-value. We probe with a depth gauge, mark deficient bays, and add a targeted supplementary lift after confirming deck temperature with a non-contact thermometer.
- Demilec AgriThane agricultural-grade foam misapplied in residential crawl spaces. We’ve found AgriThane - formulated for metal buildings and not intended for living spaces - in two Boerne crawl spaces near River Road, installed by owners who bought bulk drums online. The foam off-gasses differently and lacks the fire-retardant package required by IRC Section R316. We remove it entirely, document the extraction with photos, and install proper residential-grade closed-cell to the rim joist and band board.
- Heatlok XT adhesive failure on OSB roof decks with radiant barrier foil. When Demilec closed-cell is sprayed directly over Reflectix or similar foil-faced sheathing, the foam-to-foil bond can fail in Boerne’s wide diurnal temperature swings - the foil expands and contracts on a different cycle than the foam. We remove the failed material, install a proper vented channel or remove the foil where code allows, then re-foam with a primer-compatible formulation.
- Sealection AgriBalance odor persistence in encapsulated attics. The bio-based content in AgriBalance can retain amine odor longer than petroleum-based foams, especially in Boerne’s limestone-heavy construction where attic ventilation is often undersized. We test with a photoionization detector, isolate the source lift, and if removal is warranted, we cut and bag the affected foam before reapplying a low-VOC alternative - with the homeowner’s written approval and a documented pre/post air sample.
Our Demilec Spray Foam Insulation Process
- 1
Call intake with a live person. No voicemail. We ask what Demilec product was installed, when, and what you’re observing - odor, visible shrinkage, temperature stratification, or energy bills that climbed without explanation.
- 2
On-site diagnostic with written scope. Wes Okafor or a trained technician arrives with a blower door, infrared camera, and moisture meter. We test first, then write. The price is fixed before any tool leaves the truck.
- 3
Parts and material decision. For Demilec repairs, we evaluate whether the original formulation is still available, whether a compatible aftermarket foam meets the thermal and ignition-barrier requirements, and whether the job calls for OEM-matching or a full system replacement. We explain the trade-off in writing.
- 4
Air sealing before foam, always. Seal the envelope first. Then fill it. Top plates, can lights, plumbing penetrations, and electrical chases get sealed with compatible caulk or gasket before a single ounce of foam goes in. The blower-door test after sealing gives us a baseline.
- 5
Application, cure monitoring, and final test. We monitor substrate temperature and relative humidity during application, document lift thickness with photos, and run a final blower-door test. You get the printed pressure-differential report in pascals, the photo record, and the written warranty.
- 6
Cleanup and 365-Day Done Right Promise activation. The crew vacuums, removes protective sheeting, and leaves the documented record - including before-and-after CFM50 readings if air sealing was performed. The Haven Standard warranty is in force from that moment.
What Demilec Spray Foam Insulation Costs in Boerne
These are real ranges for Demilec-specific work we’ve performed in Boerne and the Hill Country. Every job gets a written price before work starts; these figures help you budget before you call.
| Job Type | Typical Range | What Moves the Price |
|---|---|---|
| Demilec open-cell touch-up / deficient lift repair (attic, up to 500 sq ft) | $2,800 - $4,200 | Accessibility, depth of original foam, need for removal vs. supplement |
| Demilec closed-cell rim joist replacement (typical 1,800 sq ft home) | $3,500 - $5,800 | Basement vs. crawl space height, extent of shrinkage, vapor barrier condition |
| Demilec roof deck re-foam (vaulted or conditioned attic, 1,200 sq ft) | $5,200 - $8,900 | Removal of failed foam, need for ignition barrier, deck repairs |
| Demilec garage ceiling / bonus room floor (600 sq ft typical) | $2,400 - $3,900 | Car storage load, fire separation requirements, duct routing |
| Full Demilec removal and replacement with alternative foam | $6,500 - $12,000+ | Square footage, disposal complexity, new foam specification |
Factors that push any job toward the higher end: working in Boerne’s tight attic spaces near the historic district, where roof pitches are steep and summer deck temperatures exceed 140°F; discovery of non-Demilec materials layered underneath that must be extracted; and code-required ignition barriers that weren’t part of the original installation. We quote the full scope, not a teaser rate with surprises after demolition.
Call (830) 529-7780 for a free estimate. Bring us a competing quote - we offer a Free Second Opinion on any written estimate, and we’ll read it with you line by line.
Why Boerne Homeowners Call Topside Attic Insulation Boerne for Demilec Work
We’re not a foam-only shop. We work with Owens Corning, Johns Manville, Knauf, Rockwool, CertainTeed, Icynene, Demilec, and GreenFiber - which means when a Demilec system has failed in a way that makes replacement smarter than repair, we can specify the right alternative without proprietary lock-in.
Our technicians are background-checked, uniformed, and trained to the Haven Standard. Calls are answered by a live person 24/7. Every job since 2016 has started with a written price and ended with a Documented Photo Record; on air-sealing jobs, you get before-and-after blower-door numbers in your hand, not in our marketing.
The 365-Day Done Right Promise applies to all Demilec work. If the foam shrinks, if the odor persists, if the numbers don’t match the scope - we make it right. The warranty is written and delivered before anyone starts, not offered as an afterthought when something goes wrong.
FAQs
The original Demilec product warranty typically requires installation by a Demilec-certified contractor using specified materials; as an independent Demilec service provider, our repairs don’t extend or transfer that OEM warranty. What we provide is our own 365-Day Done Right Promise on the workmanship, plus a written scope and material specification you can keep for your records. Call (830) 529-7780 and we’ll review what coverage, if any, might still apply to your original installation.
We source OEM Demilec formulations when they’re available and appropriate for the repair; when a product line has been discontinued or when a compatible aftermarket foam offers better performance for the specific Boerne climate condition, we explain that in writing and get your approval before application. We don’t stock proprietary blends or claim exclusive relationships with any manufacturer.
Replacement makes sense when the failure pattern is systemic - multiple lifts shrinking, widespread odor, or a fundamental mismatch between the foam type and the application - or when the cost of staged repairs approaches 70% of full replacement. Repair is viable when the deficiency is localized, the substrate is sound, and the original foam specification was correct. We make that recommendation after diagnostic testing, not during a phone estimate. Call (830) 529-7780 for a free assessment.
Most Demilec spray foam insulation jobs in Boerne are scheduled within 48 hours of your call, with completion in one to two days depending on cure time and whether removal is required. We don’t schedule faster than we can monitor properly - closed-cell foam needs temperature-controlled cure time, and we won’t rush that. Call (830) 529-7780 to check current availability.
Heat and humidity accelerate off-gassing from any spray foam, but Demilec’s bio-based formulations - particularly AgriBalance and early Heatlok HFO batches - can exhibit amine odor persistence when attic ventilation is undersized for Boerne’s limestone-heavy, high-radiant-heat climate. The smell isn’t necessarily a health hazard, but it’s not acceptable either. We test with a photoionization detector, identify the source lift, and remediate with removal or encapsulation depending on the reading. Call (830) 529-7780 if you’re experiencing this - we can test and tell you exactly what you’re dealing with.
Written by Wes Okafor, Owner, Topside Attic Insulation Boerne at Topside Attic Insulation Boerne, serving Boerne and nearby areas.