Knauf Attic Insulation Nationwide

Knauf Attic Insulation: The New Braunfels Owner’s Guide

We stock and install Knauf EcoFill, Jet Stream, and InsulSafe blowing wool and batts for attics across New Braunfels, with most retrofits running $1.80 to $3.40 per square foot installed depending on target R-value and existing conditions. Same-day installation is available when we have your target depth and square footage confirmed by phone. Homeowners usually discover their Knauf insulation is underperforming when the upstairs bedrooms won’t cool below 78 degrees in July, or when they find compressed, rodent-damaged batts in the scuttle hole that haven’t met spec in years.

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Which Knauf Models This Applies To

Knauf’s residential attic line breaks into three families we see in New Braunfels homes: EcoFill Wx (loose-fill fiberglass, blown to R-30 to R-60), Jet Stream Ultra (higher-density blowing wool for netted or open-blow applications), and InsulSafe SP (spray-applied system, less common in retrofits). The bag label shows the series, manufacturing date, and nominal bag weight. For a match, we need the existing depth, any settled compression, and whether your original install was open-blow or contained within netting or baffles.

OEM Knauf bags run consistent at 1.5 pounds per cubic foot for EcoFill, but we’ve found Jet Stream Ultra at 1.8 pcf performs better in the humid, wind-driven conditions off the Guadalupe River corridor where attic moisture cycling is aggressive. Aftermarket equivalents exist from Owens Corning and Johns Manville, but Knauf’s ECOSE binder formulation (the brown, formaldehyde-free bonding agent) has different settling characteristics than standard phenolic-bound fiberglass. If you’re topping off rather than stripping, mixing binders can create density inconsistencies that show up on thermal imaging as cold stripes. We stock Knauf OEM on every truck and can match lot numbers when continuity matters for warranty documentation.

Signs Your Knauf Attic Insulation Is Failing

• Uneven temperature zones between rooms. Settled or wind-washed Knauf loose-fill creates thin spots, typically near eaves and access points where installers couldn’t maintain consistent depth. The R-value drops locally, and the room below overheats while the thermostat sits in a zone that still reads fine.
• Visible compression or matting in the attic floor. Knauf batts compressed below 75% of labeled thickness lose effective R-value permanently. Fiberglass doesn’t rebound. We see this where homeowners stored holiday decorations directly on the insulation, or where roof leaks saturated the material before drying flat and hard.
• Ice damming at the eaves in rare freeze events. Even in New Braunfels, January 2024 proved that inadequate attic R-value combined with bypass leakage lets heat escape fast enough to melt roof snow at the ridge, which refreezes at the cold overhang. Knauf insulation that’s thin or bypassed by unsealed top plates can’t stop this.
• Dust or insulation particles in recessed can lights. This means air is moving through the Knauf material, not just around it. Either the insulation was blown over an unsealed penetration, or the material itself has degraded enough to allow particulate carry-through during pressure changes.
• Energy bills rising year-over-year with no rate change. Knauf fiberglass settles 1-3% annually under ideal conditions; in attics with rodent activity or moisture cycling, we’ve measured 15% depth loss in five years. The material is still there, but the thermal resistance isn’t.

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Replacement Cost & What’s Included

Most Knauf attic retrofits in New Braunfels run $1,800 to $4,200 for a 1,500 to 2,500 square foot home, with the spread driven by three factors: whether we’re topping off existing material or stripping to the ceiling deck, the target R-value (R-38 is code minimum; R-49 to R-60 is what we spec for homes off River Road where summer attic temps hit 140°F), and whether air sealing is required first.

Our price includes the Knauf material, blower rental and setup, containment for living spaces, and disposal of removed insulation if applicable. Every job gets a written scope before we start, and applicable jobs include before-and-after blower-door numbers so you can verify the air-sealing result. The 365-Day Done Right Promise covers all completed work. We also stock Reflectix radiant barrier if your roof deck needs a heat-flux reduction layer above the Knauf insulation.

DIY or Call Us?

You can safely check your existing Knauf depth with a yardstick at multiple points, photograph the bag labels if any remain, and verify whether your soffit baffles are intact. What you cannot safely do: walk a trussed attic without proper plank distribution, operate a loose-fill blower without respiratory and eye protection, or diagnose whether the insulation is failing or the bypasses around it are the real problem.

We’ve found unsealed top plates leaking 400 CFM50 in homes where the owner was certain the insulation was the culprit. The number on the blower-door printout tells you what the insulation did. Everything else is just talk. Call (830) 243-6352 and we’ll run the diagnostic before you spend money on material you may not need.

FAQs