Knauf Wall Insulation in Boerne: What to Know First
We provide independent Knauf wall insulation service in Boerne, typically scheduling within 48 hours and completing most jobs in a single day. Most drill-and-fill wall insulation jobs for Knauf products in a home this size run between $2,800 and $5,400, and we deliver a written price before anyone lifts a tool. This page is for homeowners who already have Knauf insulation in their walls and need to add it, replace it, or fix what another contractor left behind. If your walls are cold in January or your upstairs never cools below 78 in a Boerne August, the problem is usually air moving through the cavity before it ever reaches the insulation. Call (830) 529-7780 and we’ll run a blower-door test to prove it.
How Knauf Products Fail - and How We Fix Them
- Knauf EcoSeal settling in 2×4 walls. EcoSeal, Knauf’s water-based elastomeric sealant, is designed to be applied before batts go in, but in Boerne’s expansion-clay soil zones we’ve found it cracked in homes built 2018-2021 where framing lumber dried unevenly. The sealant film separates from the stud, and convection loops form behind the drywall. We remove the compromised EcoSeal with mechanical abrasion, re-seal with Knauf’s recommended reapplication or switch to a compatible closed-cell approach depending on cavity depth, then document the before-and-after CFM50 change.
- Knauf Jet Stream Ultra density drop in drill-and-fill retrofits. Jet Stream Ultra is a high-velocity blown fiberglass, but when installers rush the fill rate in older Boerne homes with irregular stud bays, the material doesn’t reach design density. It feels full to the touch but reads 20-30% below R-value on our thermal camera. We core-sample suspect walls, measure the settled density against Knauf’s published coverage chart, and re-blow to spec using a slower hose progression and staged filling.
- Knauf Insulation Board (KIB) thermal bridging at rim joists. KIB polyiso boards installed on exterior walls in Boerne’s hill-country construction often get interrupted by floor joists with no continuity detail. The wood framing becomes a thermal short, visible on infrared as a stripe pattern every 16 inches. We supplement with cut-and-cobble KIB fitted to rim joist cavities, sealed with Knauf-compatible foil tape, then verify with surface-temperature readings.
- Knauf Momentum batts compressed by improper wiring runs. Momentum batts need their full labeled thickness to achieve R-value, but electricians in a hurry sometimes pin them against the stud with cable stacks. In a 2019 home near River Road Park, we found a 16-foot wall where R-13 batts were compressed to R-7 effective. We re-route wiring through bored holes with protective grommets, reinstall Momentum to full loft, and photograph every bay.
- Knauf EcoBatt with ECOSE Technology moisture retention in south-facing walls. ECOSE’s plant-based binder is hydrophilic under sustained condensation, and in Boerne’s spring humidity with afternoon solar gain, we’ve seen south walls develop musty batt edges where vapor drive exceeded the assembly’s drying capacity. We don’t just replace the batts; we diagnose the moisture source, add a vented rainscreen or adjust interior humidity targets, then specify Knauf’s unfaced batts with a separate smart vapor retarder where appropriate.
Our Knauf Wall Insulation Process

- 1
Call and scheduling. A live person answers, 24/7. We book a diagnostic visit, usually within two business days in Boerne.
- 2
Blower-door test and thermal imaging. We pressurize the house and record CFM50, then walk the interior with a FLIR camera to map cavity anomalies. You get the number in writing.
- 3
Cavity inspection and written scope. For retrofits, we drill a 2-inch inspection hole per wall section to verify existing conditions. We specify Knauf OEM materials or, when Knauf has supply gaps, a quality aftermarket equivalent with matched thermal performance. The price is flat, written, and signed before work starts.
- 4
Air sealing first, then insulation. Top plates, electrical penetrations, and window rough openings get sealed with compatible products. Seal the envelope first. Then fill it.
- 5
Installation to density or thickness spec. Whether Jet Stream Ultra, Momentum batts, or KIB, we install to Knauf’s published coverage or R-value tables, not to what looks right.
- 6
Post-test, photo record, and documentation. We run the blower door again, print the pressure-differential report in pascals, and deliver your Documented Photo Record with before-and-after numbers. The 365-Day Done Right Promise begins when we leave.
What Knauf Wall Insulation Costs in Boerne
| Job Type | Typical Range | What Moves the Price |
|---|---|---|
| Drill-and-fill retrofit, 1,200 sq ft home | $2,800 - $4,200 | Cavity depth (2×4 vs 2×6), existing insulation removal, stucco vs siding exterior |
| Drill-and-fill retrofit, 2,400 sq ft home | $4,000 - $5,400 | Second story access, interior wall count, Knauf Jet Stream Ultra vs. alternative fill |
| Interior wall soundproofing with Knauf acoustic batts | $1,800 - $3,200 | Number of walls, electrical outlet relocation, double-stud vs. standard framing |
| Knauf Insulation Board exterior retrofit (per wall) | $3,500 - $6,000 | Scaffolding needs, rainscreen detailing, window/door trim extension |
Three factors push any job toward the high end: homes with stucco exteriors that require more careful drill-and-patch work, cavities containing old rock wool or vermiculite that must be removed first, and walls where we’ve measured air leakage above 300 CFM50 per floor. We also carry Reflectix and other brands when Knauf’s lead times don’t match your timeline. Call (830) 529-7780 for a written estimate - they’re always free, and we offer a Free Second Opinion on any competing written quote.
Why Boerne Homeowners Call Topside Attic Insulation Boerne for Knauf Work

We’ve sealed and insulated more than 9,000 homes since 2016, and the ones in Boerne’s older neighborhoods near the Cibolo Nature Center taught us what stack-effect leakage does to cooling loads before insulation ever goes in. Wes Okafor runs a blower-door test on every applicable job, then hands you a printed pressure-differential report in pascals so the performance change is on paper. Our technicians are background-checked, uniformed, and trained on Knauf’s specific product lines - not generic “fiberglass” knowledge. If Knauf Jet Stream is backordered, we pivot to Johns Manville or Owens Corning equivalents with matched specs, documented in your written scope. Under Haven Standard: flat price, written warranty, documented record, no exceptions.
FAQs
No. Knauf’s product warranties cover material defects, not who installs them, provided installation follows published guidelines. We install to Knauf’s coverage charts and density specs, and we document our work with photos so any future claim has evidence. If you’re concerned about a specific product registration, call us at (830) 529-7780 and we’ll walk through it with you.
Most Boerne homes are completed in one day for drill-and-fill retrofits, or two days if we’re removing old insulation first. Exterior board jobs with rainscreen detailing typically run three days. We give you a hard start and end time in writing, not a window.
Repair makes sense when the material is dry, uncompressed, and properly sealed - we can supplement gaps with matching Knauf product. Replacement is the right call when we find moisture damage, pest infestation, or batts compressed below 80% of labeled thickness. During our diagnostic, we’ll core-sample and show you what we found, then price both paths so you decide from fact.
Knauf has discontinued some pre-2015 batt formulations, but thermal performance is what matters, not brand loyalty. We specify current Knauf equivalents or, when appropriate, matched products from Johns Manville or Owens Corning with identical R-value and permeance ratings. The substitution is noted in your written scope with manufacturer data sheets attached.
We typically schedule diagnostics within 48 hours, and most Knauf wall jobs start within a week of estimate approval. Emergency situations - exposed cavities after water damage, for instance - get same-day response. Call (830) 529-7780; a live person answers.
Written by Wes Okafor, Owner, Topside Attic Insulation Boerne at Topside Attic Insulation Boerne, serving Boerne and nearby areas.