Johns Manville Blown-In Insulation in New Braunfels: What to Know First
As an independent Johns Manville service provider, we install, repair, and replace Johns Manville blown-in insulation systems in New Braunfels homes, typically scheduling within 48 hours and completing most attic jobs in a single day. Every job starts with a written price - no exceptions - and ends with a documented photo record plus before-and-after blower-door numbers when air sealing is part of the scope. If you own a Johns Manville blown-in system that has settled below grade, developed thermal bridging, or simply never performed to spec in our hot-humid climate, this page covers what actually fails, what it costs, and how we fix it. Call (830) 243-6352 for a free estimate with a written price before any work starts.
How Johns Manville Products Fail - and How We Fix Them
- Climate Pro Fiberglass settling below top plate. The Climate Pro loose-fill fiberglass line - common in New Braunfels tract builds from 2015-2020 - compacts to roughly 70% of its installed depth within five to seven years in attics that see repeated 140°F summer surface temps. We remove the settled material, air-seal top plates and can-light penetrations first, then reinstall to true R-38 depth with a marked ruler photo every fifty square feet.
- Spider Plus fiberglass clumping around ductwork. Spider Plus, the formaldehyde-free fiberglass designed for sidewall dense-packing, wicks moisture when attic humidity exceeds 65% RH - routine in New Braunfels from May through October. The clumps create voids that read cold on infrared. We extract the compromised batts, treat the duct boots with mastic sealant, and redeploy fresh Spider Plus only after verifying the HVAC condensate line isn’t contributing.
- Attic Protector cellulose bridging over irregular joist bays. Attic Protector blown cellulose, the brown-gray material you’ll see in older Canyon Lake-area homes, bridges across recessed light housings and dropped soffits rather than filling them. That leaves a two-inch air gap that nullifies the R-value directly above your ceiling. We spot-remove the bridge, box out fixtures with fire-rated covers, then re-blow to uniform depth.
- Formaldehyde-free binder breakdown in retrofit top-ups. Johns Manville’s newer formaldehyde-free binders degrade faster when new blown-in is layered over old without addressing the underlying air leakage path. We see this in River Road corridor slab homes where stack effect pulls attic air down through partition walls. We blower-door test first, seal the bypasses, then top up - never before.
- Incorrect initial density in JM blown fiberglass. Climate Pro and Spider Plus both require 0.5 to 0.6 pounds per cubic foot for settled performance; installers working too fast with standard hoses often hit 0.35 or lower. The insulation looks full but settles to R-20 equivalent within two seasons. We use JM-specified blowing equipment, verify density with core samples, and photograph the scale readout.
Our Johns Manville Blown-In Insulation Process
- 1
Call and scope. A live person answers 24/7. We ask the product line if you know it, the home’s age, and whether you’ve had prior insulation work. We schedule a site visit with a written price commitment - Haven Standard Clause 1.
- 2
Blower-door test and attic inspection. Wes or a named technician runs the pressurization diagnostic - CFM50 before any work begins. We photograph existing Johns Manville product depth, condition, and any air bypasses. You get a text when we’re ten minutes out.
- 3
Air sealing first, always. Top plates, wire penetrations, can lights, chimney chases, and duct boots get sealed with foam, caulk, or fire-rated materials as code requires. No insulation goes in until the blower-door number drops to its sealed baseline.
- 4
Material selection and installation. We match or specify Johns Manville product by application - Climate Pro for open attic floors, Spider Plus for dense-pack sidewalls, Attic Protector for cellulose jobs. OEM material or equivalent spec from our multi-brand inventory; no proprietary lock-in.
- 5
Post-install verification and documentation. Second blower-door test, depth verification photos, and a documented photo record uploaded to your job file. The number on the blower-door printout tells you what the insulation did. Everything else is just talk.
- 6
Written warranty and 365-Day Done Right Promise. Written scope, written warranty, and our promise: if it’s not done right, we make it right. The paperwork arrives before the crew leaves.
Before
AfterWhat Johns Manville Blown-In Insulation Costs in New Braunfels
Most Johns Manville blown-in jobs in a New Braunfels home between 1,800 and 2,400 square feet run $1,800 to $3,400 for attic floor work, and $2,800 to $4,600 when dense-packing exterior walls with Spider Plus. What moves the price: whether we remove existing settled material ($0.80-$1.10 per square foot), the extent of air sealing required, and access complexity - steep-pitch attics in the older Hill Country Village sections add labor time.
| Scenario | Typical Range |
|---|---|
| Climate Pro attic top-up, no removal | $1,800 - $2,600 |
| Climate Pro full replacement with air sealing | $2,800 - $3,800 |
| Spider Plus dense-pack walls (per 1,000 sq ft wall area) | $2,800 - $4,200 |
| Attic Protector cellulose removal + replacement | $3,200 - $4,600 |
We also provide free second opinions on any written estimate you’ve received - bring us the competing quote and we’ll read it with you line by line. Call (830) 243-6352 for an exact written price; estimates are free.
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 a significant share of those were Johns Manville products installed by builders or prior contractors who skipped the air sealing step. Wes Okafor grew up on the South Side of Chicago, trained at Dawson Technical Institute, and has spent nearly two decades sealing attics across Central Texas - including enough River Road corridor jobs to know that slab homes in New Braunfels leak more through partition walls than most homeowners expect. Our technicians are background-checked and uniformed; the person who answers your call is a live human, not a voicemail loop. We carry Owens Corning, Knauf, Rockwool, and Reflectix alongside Johns Manville, so if a multi-material solution performs better for your specific envelope, we’ll say so. Every job gets the Haven Standard: written price first, documented record last, blower-door numbers in between.
FAQs
No - product warranties cover manufacturing defects, not who installs or services the material. Johns Manville’s limited warranty on Climate Pro and Spider Plus runs from the manufacture date and covers product failure under normal conditions; our work is backed by our own 365-Day Done Right Promise and written warranty. Keep your original purchase documentation if you have it, but our installation does not affect JM’s product coverage. Call (830) 243-6352 if you’d like us to review your situation.
Yes - Johns Manville blown-in products are commodity insulation, not proprietary systems. If a prior contractor used a custom-mix additive or off-brand topper, we identify it during inspection and specify the correct JM replacement or an equivalent-performing material from our multi-brand inventory. We do not lock you into a single manufacturer. Bring us any prior paperwork for a free second opinion.
Topping up is cheaper upfront - typically $600-$1,200 less on a standard New Braunfels attic - but it’s only sensible if the existing material is dry, uncontaminated, and the air leaks are already sealed. If your Climate Pro or Attic Protector has settled below the joist tops, shows rodent activity, or was installed over unsealed bypasses, removal and proper reinstallation costs more initially and saves substantially more over the life of the home. We give you both numbers in writing and explain which applies to your attic.
Most attic jobs schedule within 48 hours and finish in one day; dense-pack wall work with Spider Plus typically requires two days due to access and cure time. Emergency situations - soaked insulation after a roof leak, for example - we prioritize same-day or next-morning response. A live person answers (830) 243-6352 around the clock to schedule.
We are an independent contractor with no exclusive brand relationship. Our inventory includes Owens Corning, Knauf, Rockwool, CertainTeed, and Reflectix alongside Johns Manville. If your existing insulation is a different brand in good condition, we can top up with a compatible spec or transition to a new material at a junction point - whichever performs better for your envelope and budget. We explain the trade-offs in writing before you decide.
Written by Wes Okafor, Owner, Topside Attic Insulation New Braunfels at Topside Attic Insulation New Braunfels, serving New Braunfels and nearby areas.