Johns Manville Spray Foam Insulation in New Braunfels: What to Know First
Topside Attic Insulation New Braunfels provides independent Johns Manville spray foam insulation service across the New Braunfels area, with most jobs scheduled within 48 hours and completed in a single day. We give you a written price before any work starts - no exceptions - and every applicable job ends with before-and-after blower-door numbers on a printed report. If you own a Johns Manville product and need open-cell, closed-cell, rim joist, garage ceiling, or roof deck spray foam work, this page covers what actually fails, what it costs, and how we document the result. Call (830) 243-6352 for a free estimate or a free second opinion on any written quote you’ve already received.
How Johns Manville Products Fail - and How We Fix Them
- JM Corbond III open-cell shrinkage in vented attics. Corbond III can pull away from rafter edges in New Braunfels homes where attic ventilation runs high and summer roof deck temperatures exceed 140°F. We find the gaps with visual inspection and infrared, then cut back the failed foam, re-prep the substrate with JM-compatible cleaner, and reapply to the original thickness - typically 5.5 inches for R-19 performance.
- JM Corbond II closed-cell delamination from OSB roof decks. In the humid months along the Guadalupe River corridor, moisture drive from the exterior can break the bond between Corbond II and oriented strand board that was installed green or without adequate drying time. We remove the delaminated section, let the deck hit 19% moisture content or below per ASTM D4442, then reapply at 2-3 inches with a primer coat when the substrate demands it.
- JM Spider custom sealant pump failures in retrofit jobs. The Spider system’s heated hose assembly is prone to temperature sensor drift after 800-1,200 runtime hours, which throws off the A:B ratio and produces off-ratio foam - either too brittle or too slow to rise. We test the blend at the gun with a digital scale before every batch and keep spare hose sections on the truck so a sensor fault doesn’t cost you a second trip charge.
- JM Subfloor open-cell compression in pier-and-beam homes near the Comal. Older pier-and-beam construction in neighborhoods like Gruene and along Common Street often has sagging subfloors that compress open-cell foam from below, reducing its effective R-value by 30% or more. We diagnose the structural issue first, then switch to closed-cell on the rim joist and use mechanical fasteners with the open-cell to maintain full thickness.
- JM attic foam bypass at top plates and electrical penetrations. Even quality Johns Manville foam doesn’t seal what it doesn’t touch. In New Braunfels homes built 1985-2005, we regularly find unsealed top plates behind the foam line - the horizontal framing member where wall studs meet the ceiling - letting conditioned air escape into the attic. We blower-door test first, seal every penetration with JM-compatible acrylic sealant, then foam over the repair so the air barrier is continuous.
Our Johns Manville Spray Foam Insulation Process
- 1
Call and schedule. A live person answers 24/7. We ask for photos if you have them, then book a diagnostic window.
- 2
Blower-door test and visual inspection. We pressurize the house to 50 Pascals and record the CFM50 reading - your baseline. Then we inspect the Johns Manville foam with moisture meters, infrared, and probe testing where indicated.
- 3
Written price and scope. Before any work starts, you get a flat price, a written scope of work, and a written warranty. Under Haven Standard Clause 1: no work begins without it.
- 4
Air sealing first, then foam. We seal top plates, can lights, plumbing stacks, and electrical penetrations with compatible sealants. Only then do we cut back failed foam or apply new.
- 5
Application and real-time quality check. We weigh the A:B ratio at the gun, monitor substrate temperature, and document lift thickness every pass.
- 6
Final blower-door test and photo record. We depressurize again, print the before-and-after numbers, and leave you with a Documented Photo Record and the test report filed by your address. The number on the blower-door printout tells you what the insulation did. Everything else is just talk.
Before
AfterWhat Johns Manville Spray Foam Insulation Costs in New Braunfels
Most Johns Manville spray foam jobs in New Braunfels homes fall in these ranges:
- Attic open-cell retrofit (1,200 sq ft, cut-and-replace failed areas): $2,800-$4,200
- Closed-cell rim joist (pier-and-beam, ~200 linear feet): $1,800-$2,800
- Garage ceiling, open-cell (two-car, conditioned above): $1,600-$2,400
- Roof deck, full open-cell (1,500 sq ft, including air sealing): $5,500-$8,200
- Corbond III shrinkage repair, localized (up to 100 sq ft): $900-$1,500
What moves the price: accessibility (steep-pitch roofs add labor hours), how much failed foam needs removal versus overlay, whether the substrate needs drying time, and whether we find unsealed bypasses that should have been addressed in the original install. We also service Reflectix products and can quote hybrid systems if your project benefits from radiant barrier combined with foam.
Every estimate is free. Bring us a competing written quote and we’ll walk through it with you - no charge for the second opinion.
Why New Braunfels Homeowners Call Topside Attic Insulation New Braunfels for Johns Manville Work
We’ve sealed and insulated over 9,000 homes since 2016, and the ones that stick in memory are the attics where the previous contractor skipped the air sealing and the homeowner paid for foam that couldn’t perform. Wes Okafor and our crew don’t start a Johns Manville job without a blower-door baseline, and we don’t leave without a documented improvement you can show a buyer or an inspector. The 365-Day Done Right Promise applies to every job - if it’s not right, we make it right - and your written scope and warranty arrive before the rig gets unloaded. We’re independently owned and operated, not a franchise, and we’re not affiliated with or authorized by Johns Manville. We source materials from Johns Manville, Owens Corning, Knauf, and others so we can recommend what fits your assembly rather than what moves a single product line.
FAQs
Johns Manville’s product warranty covers manufacturing defects, not installation errors or subsequent modifications. Our work doesn’t void a valid manufacturing warranty, but we can’t extend Johns Manville’s own coverage. We provide our own 365-Day Done Right Promise on labor and materials we install. Call (830) 243-6352 and we’ll review your original paperwork with you.
We stock JM-compatible cleaners, primers, and sealants, and we source Corbond and Spider system components through JM distributors when the job calls for exact matching. For some repairs, a quality aftermarket equivalent performs identically at lower cost - we’ll tell you which we’re proposing and why, with the price difference noted in writing.
Localized shrinkage or delamination under 15% of the total area usually justifies spot repair. When the failure is widespread, the original foam was applied off-ratio, or we find moisture-compromised substrate throughout, full removal and reapplication saves money long-term by avoiding callbacks. We price both scenarios in our written estimate so you can compare.
Most diagnostics are scheduled within 48 hours of your call, and we complete standard repairs same-day or next-day once you approve the written price. Emergency situations - active roof leaks saturating foam, for example - get same-day response. A live person answers (830) 243-6352 around the clock.
You get a written scope, a written warranty, before-and-after blower-door readings on applicable jobs, and a Documented Photo Record of the work area. We file a copy by address, which has helped past New Braunfels homeowners when buyers’ inspectors asked questions during a sale. Everything is in your hands before we leave.
Ready to get a written price on your Johns Manville spray foam insulation project? Call (830) 243-6352 for a free estimate. We’ll run the blower-door test, show you the numbers, and give you a flat price before any work starts - guaranteed.
Written by Wes Okafor, Owner, Topside Attic Insulation New Braunfels at Topside Attic Insulation New Braunfels, serving New Braunfels and nearby areas.