Knauf Spray Foam Insulation in Schertz: What to Know First
We provide independent Knauf spray foam insulation in Schertz, typically completing open-cell and closed-cell jobs in one to two days with crews that understand Knauf’s specific chemistry and application requirements. Most homeowners receive a written price before we schedule, and we do not start work without one. This page is for Knauf owners in Schertz, Cibolo, and the FM 1518 corridor who need spray foam installed correctly the first time, with documentation to prove it. Call (830) 402-5240 for a free estimate.
How Knauf Products Fail - and How We Fix Them
- Knauf Jet Stream Ultra settling in Schertz’s high-temperature attics. This blown-in fiberglass product is sometimes found in homes that later need spray foam retrofitting, and we’ve seen it compress 15-20% in Sedona subdivision attics where summer temperatures exceed 140°F. The fix isn’t adding more of the same; we remove the settled material, air-seal the top plates and can-light penetrations, then apply Knauf spray foam to the roof deck or walls depending on the envelope strategy.
- Knauf Insulation Spray Foam (KISF) open-cell shrinkage at rim joists. The KISF 100 Series can pull away from sill plates in our clay-heavy Schertz soils, which shift seasonally and stress the bond line. We cut back the failed bead, prime the substrate with Knauf-compatible adhesive, and reapply at the manufacturer’s specified thickness with a post-cure inspection at 24 hours.
- Knauf Ecose closed-cell delamination from OSB roof sheathing. The Ecose Technology binder reacts poorly with certain OSB resins when moisture content exceeds 19% during application, a condition we find frequently in Schertz’s spring humidity spikes. We test substrate moisture with a pinless meter before spraying; if it’s high, we run dehumidification for 48 hours, then apply with the temperature-corrected pressure settings Knauf specifies.
- Knauf spray foam incompatible with existing Reflectix radiant barriers. Homeowners sometimes layer Reflectix over Knauf spray foam or vice versa, creating a double vapor barrier that traps moisture. We remove the Reflectix, assess the foam condition, and reinstall only if the assembly meets local code for vapor permeance, which in Schertz’s mixed-humid climate means careful calculation of dew-point location.
- KISF 500 Series closed-cell over-application in garage ceilings. Knauf’s higher-density product is rated for structural enhancement, but we’ve found Schertz DIYers and even some contractors spraying it past 3 inches in a single lift, causing exothermic heat buildup and core charring. We mill out the damaged foam to sound substrate and rebuild in 1-inch passes with full cure between lifts, documenting each pass in the photo record.
Our Knauf Spray Foam Insulation Process
- 1
Call and scheduling. A live person answers, 24/7. We book a site visit in Schertz, Cibolo, or the surrounding corridor within 48 hours.
- 2
Pre-work inspection and blower-door test. We pressurize the house to measure CFM50 leakage, then thermal-scan to find bypasses. In Schertz’s older subdivisions near I-35, we regularly find unsealed top plates and recessed can lights dumping conditioned air into the attic.
- 3
Written price and scope. Under Haven Standard Clause 1, you get a flat price, written scope, and written warranty before anyone lifts a tool. No exceptions.
- 4
Air sealing first, then insulation. Seal the leaks first. Then insulate. The attic doesn’t care how thick the insulation is if the air is still moving through it. We seal penetrations with Knauf-compatible sealants, then apply spray foam to the specified depth.
- 5
Post-install verification. We run a second blower-door test, provide before-and-after CFM50 readings, and deliver a Documented Photo Record with thermal-imaging summary and depth-stick photos.
- 6
365-Day Done Right Promise activation. The written warranty goes into effect immediately. If it’s not done right, we make it right.
What Knauf Spray Foam Insulation Costs in Schertz
| Job Type | Typical Range | What Moves the Price |
|---|---|---|
| Open-cell spray foam, standard attic (1,800-2,400 sq ft home) | $3,800 – $6,200 | Accessibility, existing insulation removal, roof deck vs. floor application |
| Closed-cell spray foam, garage ceiling (2-car) | $1,800 – $3,400 | Thickness specified, whether rim joist is included, existing radiant barrier removal |
| Rim joist only, basement or crawl space | $1,200 – $2,600 | Height clearance, moisture remediation needed, KISF 100 vs. 500 series |
| Full envelope, open-cell roof deck + closed-cell rim joist | $7,500 – $12,000 | Home size, complexity of HVAC routing, need for ignition barrier coating |
These ranges reflect what we see in Schertz’s market, including the Sedona and Passacre subdivisions where roof geometry and attic access vary significantly. The only way to get your exact number is a site visit, which is free. Call (830) 402-5240.
Why Schertz Homeowners Call Topside Attic Insulation Schertz for Knauf Work
We’re independently owned and operated under The Haven Standard since 2016, and we do not treat air sealing as an upsell. Wes Okafor and our crew have worked the Schertz corridor long enough to know which homes built between 2015 and 2020 have the unsealed top plates that kill spray foam performance before the truck leaves the driveway. We publish before-and-after blower-door numbers on every applicable job, source Knauf materials alongside Owens Corning, Johns Manville, and others so you’re never locked into a single product line, and deliver a Documented Photo Record on every visit. Calls are answered by a live person, 24/7, and we provide a Free Second Opinion on any written estimate you bring us.
FAQs
No, provided the installation follows Knauf’s published application guidelines and uses specified materials. As an independent Knauf service provider, we document every pass thickness, substrate temperature, and mixing ratio so warranty claims, if needed, are supported by data. Call (830) 402-5240 if you have a specific warranty concern.
Most residential jobs complete in one to two days, with a 24-hour cure period before re-occupancy for open-cell and 24 hours for closed-cell under normal conditions. Schertz’s humidity in spring and fall can extend cure times; we test substrate conditions and adjust the schedule rather than rush the chemistry. Call (830) 402-5240 to check current availability.
Repair is viable when the failure is isolated, less than 10% of total coverage, and the substrate is sound. We see this with minor shrinkage at rim joists or small delamination patches. When the failure exceeds 20% of coverage, involves core charring from over-application, or reveals widespread moisture damage, removal and replacement is the only code-compliant path. We assess this during the free site visit and give you both options in writing.
We can match Knauf’s current KISF line specifications, but aged foam may have yellowed or changed density slightly due to UV exposure or thermal cycling. We document the existing condition, source the closest current formulation, and explain any cosmetic differences before application. For homes in Schertz with mixed-era additions, we sometimes recommend treating the envelope as a single zone to avoid performance mismatches.
We maintain standard Knauf spray foam components, including KISF 100 and 500 series chemicals, compatible adhesives, and ignition barrier coatings. Specialty colors or custom-density orders typically arrive within five business days from Knauf’s regional distribution. We do not start work until materials are on-site and verified, so your timeline is never hostage to a backorder.
Written by Wes Okafor, Owner, Topside Attic Insulation Schertz at Topside Attic Insulation Schertz, serving Schertz and nearby areas.