CertainTeed Attic Insulation: The Schertz Owner’s Guide
We stock and install CertainTeed-compatible blown-in fiberglass and batt insulation for Schertz homes, with most attic insulation jobs running between $1,800 and $3,400 depending on square footage and whether air sealing is needed first. Same-day installation is available when we have your material on the truck, which we typically do for CertainTeed’s ComfortTherm and InsulSafe SP lines. Most Schertz homeowners discover their attic insulation has failed when upstairs rooms won’t cool below 78°F despite the AC running nonstop, or when they find compressed, discolored batts in the attic that have settled below the stated R-value.
Which CertainTeed Models This Applies To
CertainTeed’s residential attic insulation breaks into three main lines we see in Schertz: InsulSafe SP blown-in fiberglass (the white, loose-fill material you’ll spot in most post-2010 builds), ComfortTherm batts (the kraft-faced or unfaced rolls common in retrofits), and SpeedyR loose-fill (their higher-density option for tight blow-in applications). The label matters: InsulSafe SP is manufactured to a different settled density than standard loose-fill, so matching it with generic blown fiberglass creates thermal drift, the gradual loss of R-value as the material settles unevenly.
To identify what you’ve got, check the paper banding on batts or the bag stamp on loose-fill for the ASTM C665 compliance mark and the specific product code, CT-XXXX. The OEM-vs-aftermarket question for CertainTeed is straightforward in our experience: their blown fiberglass uses a proprietary fiber lubricant that reduces airborne dust during installation, and aftermarket loose-fill often skips this, which matters in Schertz’s tight attic spaces where the installer is working in 130°F-plus conditions and visibility is already poor. We stock CertainTeed OEM on every truck, plus Knauf and Owens Corning equivalents when the job calls for them, because no single brand owns every attic.
One compatibility gotcha specific to Schertz: homes in the Sedona subdivision and other 2015-2019 builds often have CertainTeed batts installed at R-30 but labeled for R-38, because the original installer compressed the material into 2×8 joist bays. Compressed fiberglass loses 20-30% of its rated value. We measure actual depth with a depth stick, not eyeballing, before quoting any replacement.
Signs Your CertainTeed Attic Insulation Is Failing
- Uneven temperature zones between rooms. When CertainTeed blown-in settles or gets disturbed by wiring work or rodent activity, it creates thin spots. The thermal camera shows 15-20°F surface temperature differences on your ceiling during a summer afternoon in Schertz.
- Insulation below the joist tops. Proper blown-in depth for R-38 in CertainTeed’s spec is 12 to 14 inches of settled material. If you can see the tops of your ceiling joists poking through, you’re under-insulated regardless of what was originally installed.
- Discolored or stained batts. Dark gray or brown patches on ComfortTherm batts mean air is moving through the insulation, carrying dust and humidity. This is the signature of an unsealed attic floor, and adding more insulation on top traps the moisture.
- Ice damming or heavy frost on roof decking in winter. Schertz doesn’t see Chicago-level snow, but a cold snap with moisture will reveal heat loss. Warm air hits the roof deck, condenses, and you get frost that melts into water stains. The insulation isn’t stopping the air movement.
- AC runs continuously from 2 PM to 8 PM. This is the symptom that drives most calls. Your unit is sized correctly, the ducts are sealed, but the attic is radiating 140°F heat through a compromised thermal layer. The CertainTeed material may be present but no longer performing.
Replacement Cost & What’s Included
Most CertainTeed attic insulation replacements in Schertz run $1,800 to $3,400 for a 1,500 to 2,500 square foot home. The low end covers removal of degraded batts and installation of new ComfortTherm R-38 in accessible attic space. The high end includes blower-door-guided air sealing of top plates, can lights, and plumbing penetrations before any insulation goes in, plus removal of contaminated material.
What drives the range: attic square footage, current insulation condition (removal adds $0.80 to $1.20 per square foot), and whether we need to build storage platforms or baffles to maintain vent channels. Every quote is flat, written, and delivered before work starts, Haven Standard Clause 1. The 365-Day Done Right Promise covers settling, coverage gaps, or any installation defect. We don’t quote by the bag; we quote by the measured result, verified with a post-install depth-stick photo log.
DIY or Call Us?
Here’s what you can safely check yourself: measure insulation depth with a ruler in five spots, look for the CertainTeed product label on any visible batts or bags, and note any water stains or rodent droppings. Take photos. That information gets us 80% of the way to a precise quote before we arrive.
Where DIY goes wrong: blown-in fiberglass requires a calibrated blowing machine to achieve CertainTeed’s specified settled density. Too loose, and you get thermal drift; too dense, and you compress the fibers and kill the R-value. More critically, Schertz attics in July are genuinely hazardous environments. Heat exhaustion sets in fast, and disturbed insulation releases fibers that require proper PPE and ventilation. We carry respirators, hydration protocols, and backup crew rotation for a reason.
And here’s the sequencing problem most DIY attempts miss: if you blow new insulation over an unsealed attic floor, you’ve buried the air leaks where you can’t reach them later. Seal the leaks first. Then insulate. The attic doesn’t care how thick the insulation is if the air is still moving through it. Call (830) 402-5240 and we’ll walk through what we found on your inspection, with a written price before any work starts.
FAQs
Blown-in fiberglass lasts 20 to 30 years when installed correctly and left undisturbed, but in Schertz’s climate we see performance degradation starting around year 12 to 15 due to thermal cycling and occasional rodent activity. The material doesn’t disappear; it settles, gets displaced by wiring or HVAC work, or becomes contaminated. We inspect for actual depth and coverage, not just age, when evaluating replacement. Call (830) 402-5240 for a free assessment of your specific attic.
Spot repair works only when the failure is isolated, a single disturbed area from a recent ceiling fan install, for example. Widespread settling, contamination, or compression requires removal and reinstallation to achieve consistent R-value. We don’t add new material over old unless the existing layer is clean, uncompressed, and at full specified depth. Every recommendation comes with photo documentation so you can see what we found.
A standard removal and reinstall for a 2,000 square foot Schertz home takes one full day, 6 to 8 hours, when air sealing is included. Jobs without removal, topping off existing insulation to achieve target depth, run 3 to 4 hours. We schedule morning starts to avoid the worst attic heat, and every crew has a second technician for safety rotation in summer conditions.
We keep CertainTeed InsulSafe SP and ComfortTherm batts on every truck, along with Knauf, Owens Corning, and Johns Manville equivalents. Same-day installation is available for standard R-values; specialty densities or large commercial quantities may require a 24- to 48-hour pull from our San Antonio supplier. We’ll confirm material availability when you call, and we never substitute brands without your written approval.
Written by Wes Okafor, Owner, Topside Attic Insulation Schertz at Topside Attic Insulation Schertz, serving Schertz and nearby areas.