Knauf Attic Insulation Nationwide

Knauf Attic Insulation: The Schertz Owner’s Guide

We stock and install Knauf-compatible blown-in fiberglass attic insulation for Schertz homes, with most attic 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 you call (830) 402-5240 before noon. Most homeowners discover their Knauf insulation has failed when their summer electric bills spike $80-$150 above the previous year, or when they notice the second floor of their Schertz home won’t cool below 78°F even with the AC running continuously.

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Which Knauf Models This Applies To

Knauf’s residential attic line in the Schertz market is dominated by Jet Stream Ultra (bonded blown-in fiberglass) and Ecobatt (unfaced and kraft-faced batts in R-13 through R-38). Jet Stream Ultra ships in 25-pound bags with a distinctive blue-and-white label; the product code prefix you’re looking for is JSU followed by the R-value. Ecobatt uses a tan-colored ECOSE binder rather than the industry-standard phenol-formaldehyde, which matters for homeowners with chemical sensitivities.

Here’s the compatibility gotcha we run into regularly in Schertz: Jet Stream Ultra is designed for open-blow attic applications at a minimum settled depth of 12 inches for R-38, but it cannot be dense-packed into wall cavities. If your original installer used it in walls, or if you’re trying to match wall insulation to attic insulation, the density and thermal performance will be wrong. We verify this with a depth-stick reading and a bag-count calculation against your attic square footage.

For OEM versus aftermarket, Knauf does not sell “aftermarket” fiberglass; the product is either genuine Knauf or it’s a different manufacturer entirely. We source genuine Knauf through our distributor network, along with Owens Corning, Johns Manville, and Rockwool. No proprietary lock-in. If your home was originally insulated with Jet Stream Ultra and you want an exact match for a repair or top-off, we can source it. If you’re open to equivalent performance, we’ll show you the blower-door numbers and let the data decide.

Signs Your Knauf Attic Insulation Is Failing

• Uneven temperature between floors. The upstairs runs 6-10°F hotter than downstairs because settled or displaced Knauf batts have created thermal bypasses. In Schertz, we see this most often in homes built 2005-2015 where Ecobatt was installed at minimum code depth and has since compressed or shifted.
• Ice damming or excessive frost on roof sheathing in winter. Warm, moist interior air is reaching the cold roof deck because the Knauf insulation no longer forms a continuous thermal boundary. This is almost always an air-sealing failure first, an insulation failure second.
• Visible insulation degradation or rodent disturbance. Fiberglass that has been compressed by storage traffic, disturbed by HVAC contractors, or tunneled by rodents loses its loft and with it, its R-value. Jet Stream Ultra resists settling better than loose-fill cellulose, but it can’t recover from being walked on.
• Dust accumulation around ceiling registers and can lights. This indicates the insulation barrier has been breached and attic air is being pulled into conditioned space through pressure imbalances. The Knauf product itself may be intact, but if it’s not paired with sealed top plates and penetrations, it’s not doing its job.
• Attic temperature exceeding 130°F on a 95°F Schertz afternoon. A properly insulated and ventilated attic in this climate should run 20-40°F above ambient, not 50-60°F. When we probe attics in the Sedona subdivision off FM 1518, we regularly find original Knauf installations at R-19 or R-22 that have settled to effective R-15 or below.

Replacement Cost & What’s Included

What drives the range: attic square footage, current insulation depth, accessibility (scuttle versus pull-down stairs versus no access at all), and whether we find unsealed top plates, open can lights, or ductwork leaks that need addressing first. We don’t blow insulation over an unsealed attic floor. Under Haven Standard Clause 1, you get a written price before any work starts, flat and itemized, with no change orders unless you add scope. Every job includes a Documented Photo Record and, on air-sealing jobs, before-and-after blower-door readings so you can verify the performance change.

DIY or Call Us?

There’s nothing inherently dangerous about handling Knauf fiberglass insulation, but there are ways DIY goes wrong that are expensive to undo. You can safely check your current depth with a ruler or depth stick, photograph any disturbed areas, and verify your attic ventilation isn’t blocked. Where DIY fails: compressing batts into cavities they’re not sized for, blowing Jet Stream Ultra at the wrong density, or adding insulation before sealing air leaks. We’ve been called into Schertz homes where a homeowner added R-30 over R-19 and saw no bill reduction because the conditioned air was still escaping through unsealed top plates.

Seal the leaks first. Then insulate. The attic doesn’t care how thick the insulation is if the air is still moving through it.

For a free estimate with a written price before any work starts, call (830) 402-5240. We answer live, 24/7.

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