Icynene Blown-In Insulation in Seguin: What to Know First
We provide independent Icynene blown-in insulation service in Seguin, typically scheduling within 24 to 48 hours and completing most attic jobs in a single day. Most blown-in cellulose or fiberglass top-ups in Seguin homes run between $1,800 and $3,400 for a standard attic, with dense-pack wall work starting closer to $2,800 depending on cavity access. We give you a written price before any work starts, and we do not begin until you’ve signed off on the scope.
This page is for homeowners who already have Icynene spray foam in their building envelope and need blown-in insulation added, topped up, or repaired. That includes original Icynene installations that have settled, been damaged by rodents, or were underspecified for Seguin’s combination of humid Gulf air and Hill Country temperature swings. If that describes your home, call us at (830) 549-6646 and we’ll read your existing insulation situation with you, no charge.
How Icynene Products Fail - and How We Fix Them
- Icynene Classic Max settling in vented attics. Classic Max, the open-cell formulation common in pre-2018 Seguin builds, shrinks up to 10% over its first decade as off-gassing completes. In attics with passive ventilation, that shrinkage pulls the foam away from rafter heels and top plates, creating channels where conditioned air escapes straight into the soffit airflow. We map these gaps with thermal imaging, remove the failed sections, and blow in GreenFiber cellulose or Owens Corning fiberglass to the correct R-value for Guadalupe County’s climate zone.
- Icynene MD-R-200 moisture retention in crawl spaces. MD-R-200 is a medium-density closed-cell foam rated for ground contact, but in Seguin’s clay-heavy soils it can trap bulk water against rim joists when the vapor barrier below it fails. The foam itself doesn’t rot, but the adjacent framing does. We strip the affected MD-R-200, treat the wood, install a proper polyethylene ground seal, then dense-pack the rim joist cavities with blown-in fiberglass that allows some drying to the interior.
- Icynene H2Foam Lite overspray bridging in wall cavities. H2Foam Lite expands aggressively, and installers working fast on production homes sometimes overfill stud bays. The excess cures as a bridge between opposing studs, creating a thermal short that conducts heat straight through the wall plane. We spot these with borescope inspection, surgically remove the bridges, and dense-pack the cavity with Knauf Jet Stream Ultra blown-in fiberglass to restore the intended R-value without the bridging defect.
- Icynene LD-C-50 degradation from attic rodent activity. LD-C-50’s lower density makes it attractive to roof rats and squirrels for nesting material, particularly in Seguin neighborhoods with mature oak canopy like those near Guadalupe Regional Medical Center. The animals don’t eat the foam, but their compaction and urine saturation destroy its thermal performance and create odor issues. We remove the contaminated foam, sanitize the substrate, rodent-proof with metal flashing and hardware cloth, then blow in fresh cellulose treated with borate for pest resistance.
- Icynene proprietary topcoat compatibility failures. Some Icynene installations received factory-recommended intumescent topcoats that degrade under UV exposure in Seguin’s 2,600+ annual sunshine hours when attic ventilation is inadequate. The chalking topcoat flakes into the living space through recessed can lights. We HEPA-vacuum the debris, assess whether the underlying foam is sound, and if so, blow in a protective cellulose cap over the foam to shield it from both UV and further mechanical damage.
Our Icynene Blown-In Insulation Process
- 1
Call and scheduling. A live person answers, or you text us back if you prefer. We book a diagnostic visit, usually within 24 to 48 hours in Seguin proper.
- 2
On-site assessment and blower-door test. We run a blower-door test - a pressurization diagnostic that measures how much conditioned air your house loses per hour - to establish your baseline ACH50. Then we thermal-scan the Icynene installation to locate gaps, settling, or moisture intrusion. You get a written scope and a flat price before anyone lifts a tool.
- 3
Parts and materials selection. For Icynene jobs, we use Icynene-compatible materials: GreenFiber, Owens Corning, Johns Manville, or Knauf blown-in products, selected by cavity type and your existing foam condition. We do not use proprietary lock-in products.
- 4
Air sealing first, then insulation. Under our sealed-first protocol, we complete top plate sealing, can light boxing, and penetration caulking before any blown-in material goes in. The blower-door test after sealing but before insulation gives you a mid-point number showing exactly what the air sealing alone achieved.
- 5
Blown-in installation and density verification. We install to manufacturer density specs, spot-checking with core samples in wall cavities and depth markers in open attics. The work is photographed throughout for your Documented Photo Record.
- 6
Final blower-door test and documentation. We run the blower-door again, compare pre- and post-installation ACH50, and print the report. The report goes home with you - the numbers do the talking. Your 365-Day Done Right Promise is in writing before we leave.
Before
AfterWhat Icynene Blown-In Insulation Costs in Seguin
These ranges reflect what we see on actual Icynene-related jobs in Seguin and Guadalupe County:
| Scenario | Typical Range |
|---|---|
| Attic top-up over existing Icynene (1,200-2,000 sq ft) | $1,800 - $2,800 |
| Attic full replacement after Icynene removal | $3,200 - $5,400 |
| Dense-pack wall insulation (per 1,000 sq ft of wall) | $2,800 - $4,200 |
| Rim joist dense-pack after MD-R-200 failure | $1,400 - $2,600 |
| Rodent damage remediation + re-insulation | $2,200 - $4,800 |
What moves the price: accessibility of the cavity, extent of existing foam removal required, need for temporary containment during HEPA vacuuming, and whether we discover hidden moisture damage that needs drying time before new insulation goes in. We do not upsell; we document what we find, show you the photos, and you decide.
Bring us any written estimate and we’ll read it with you - our Free Second Opinion is exactly that, free. Call (830) 549-6646 for a written price before any work starts.
Why Seguin Homeowners Call Topside Attic Insulation Seguin for Icynene Work
We’ve been independently owned and operated under The Haven Standard since 2016, and we’ve sealed and insulated over 9,000 homes since then. Every job gets a written price first, a Documented Photo Record during, and printed blower-door numbers after.
Wes Okafor, our owner and lead technician, learned thermal envelope science at Triton College in River Grove, IL, and he’s spent over two decades in the trade. In Seguin, his crew has worked the older neighborhoods near Guadalupe Regional Medical Center where 1960s and 1970s framing almost always needs air sealing before any blown-in product goes up. They know Icynene’s product line well enough to spot installation-era shortcuts without tearing out more than necessary.
We’re not affiliated with Icynene - we’re an independent service provider with access to Owens Corning, Johns Manville, Knauf, Rockwool, CertainTeed, Icynene, Demilec, GreenFiber, and Reflectix materials. No proprietary lock-in means we specify what’s right for your cavity, not what’s in our exclusive catalog.
Calls are answered by a live person, 24/7. No voicemail loops. No callback windows measured in business days.
FAQs
Adding blown-in insulation over or adjacent to Icynene foam does not automatically void the manufacturer’s warranty, but modifying the foam itself - cutting, grinding, or chemically treating it - can. We work around existing Icynene installations without altering the cured foam substrate, and we document our method in writing so you have a record if a warranty question ever arises. Call (830) 549-6646 if you want us to review your original Icynene documentation with you.
Most Seguin homeowners get a diagnostic appointment within 24 to 48 hours, and we complete standard blown-in top-ups in a single day. Emergency situations - active roof leaks saturating foam, or HVAC failure due to insulation collapse - get same-day response when you call (830) 549-6646.
Repair is cheaper when the foam is sound but displaced - settling gaps, minor rodent damage under 15% of coverage, or isolated moisture spots. Full removal and replacement makes sense when the foam is extensively degraded, chemically incompatible with a needed topcoat, or when the original installation was so underspecified that you’re paying utility bills 40% above comparable Seguin homes. We show you the thermal images and the blower-door numbers, then you decide. Written price either way - call for an exact scope.
Blown-in cellulose or fiberglass at proper density achieves comparable R-value per inch to Icynene open-cell foam, but not the air-sealing function. That’s why we air-seal first - top plates, penetrations, can lights - then blow in insulation. The combined assembly typically outperforms the original Icynene installation if that foam was installed without adequate air sealing, which we see frequently in 2015-2019 Seguin production builds. The post-installation blower-door test proves it.
We do not stock Icynene spray foam kits or proprietary chemicals - as an independent service provider, we work with Icynene-compatible blown-in materials from multiple manufacturers. For repairs requiring additional Icynene foam, we refer you to a certified Icynene applicator; for everything else - top-ups, dense-pack, replacement, and air sealing - we handle it directly with materials from our standard line. Call (830) 549-6646 and we’ll tell you which category your job falls into.
Written by Wes Okafor, Owner & Lead Insulation Technician, Topside Attic Insulation Seguin at Topside Attic Insulation Seguin, serving Seguin and nearby areas.