Johns Manville Attic Insulation: The Pflugerville Owner’s Guide
We stock and install Johns Manville-compatible blown-in fiberglass and batt insulation in Pflugerville, with most attic jobs running $1,800 to $4,200 depending on square footage and whether the attic floor needs air sealing first. Same-day installation is available when we have your R-value and coverage area on the phone. Most Pflugerville homeowners discover their Johns Manville insulation is failing when upstairs rooms won’t cool below 78°F in July, or when they find compression spots, moisture staining, or rodent damage during a seasonal HVAC check.
Which Johns Manville Models This Applies To
Johns Manville produces several attic insulation lines, and the part number you need depends on what is currently in your joist bays. The Climate Pro blown-in fiberglass series, commonly found in Pflugerville homes built between 2010 and 2020, carries lot numbers starting with CP-B and is rated at R-38 to R-49 for our climate zone. The batts, usually Kraft-faced or unfaced, run from R-13 to R-30 and are stamped with a yellow JM logo and density spec on the paper facing.
To identify what you have, pull back a section near the attic hatch and read the label. If the label is degraded, measure the settled depth: Climate Pro settles to roughly 12 inches at R-38, and anything under 10 inches in a Pflugerville attic is below current code for new work. We do not require you to know the exact series before calling. We carry Johns Manville, Owens Corning, Knauf, and CertainTeed on our trucks, so if your existing insulation is a hybrid install or the original JM lot is discontinued, we match the thermal performance, not necessarily the brand. Topside Attic Insulation Pflugerville is an independent service provider with no affiliation to Johns Manville.
One compatibility gotcha in this market: some production builders in the Stone Hill Town Center corridor used JM R-30 batts in 2×8 joist bays, which compresses to R-26 or lower once walked on during ductwork service. Compressed fiberglass loses its rated R-value because the trapped air pockets collapse. We see this several times a month. The fix is not more of the same batt; it is blown-in fill that recovers full depth without the compression penalty.
Signs Your Johns Manville Attic Insulation Is Failing
- Uneven temperatures between rooms. If the master bedroom runs five degrees hotter than the hallway in August, the insulation over that room has likely shifted, settled, or been displaced by a contractor crawling to the air handler. Blown-in fiberglass migrates over time, especially near attic access paths.
- Ice-cold drywall in winter, hot to the touch in summer. This means the thermal boundary is effectively missing in that spot. In Pflugerville, where attic temperatures hit 140°F in July, uninsulated drywall radiates that heat straight into conditioned space.
- Moisture stains on ceiling drywall or rafter staining. Fiberglass does not stop air movement, and if your attic floor was not sealed before the JM went in, humid conditioned air leaks upward, hits the cold roof deck in winter, and condenses. The insulation gets wet, mats down, and molds.
- Energy bills climbing year over year with no rate change. A blower-door test will usually reveal the culprit: the house is leaking 3,500 CFM50 or more, and the insulation is doing nothing because the air is moving right through it. The report tells you what the house does. The insulation changes what the house does. Those are two different conversations.
- Rodent nesting or droppings in the insulation. Once fiberglass is contaminated, it does not clean well. The urine soaks in, the fibers clump, and the R-value drops. We remove and replace, then seal entry points as part of the job.
Before
AfterReplacement Cost & What’s Included
Most Johns Manville attic insulation replacements in Pflugerville run $1,800 to $4,200 installed. The low end covers a straightforward blown-in top-off over existing batts in a 1,200-square-foot attic with no removal required. The high end includes full removal of contaminated or compressed material, air sealing of top plates, can lights, and penetrations, then new blown-in fill to R-38 or R-49, plus before-and-after blower-door numbers.
What drives the range: attic square footage, whether removal is needed, accessibility (steep roof pitch or limited hatch size), and whether the attic floor needs sealing first. We will not blow new insulation over an unsealed attic floor. Under Haven Standard Clause 1, you get a written price before any work starts, flat, with no add-ons after the crew arrives. Every job closes with a Documented Photo Record and, on applicable work, written blower-door readings showing the CFM50 before and after. The 365-Day Done Right Promise covers all completed work.
DIY or Call Us?
There is nothing dangerous about handling fiberglass insulation itself, though long sleeves, gloves, and a respirator are non-negotiable. The hazard is what you cannot see: electrical wiring buried under old insulation, can lights that are not IC-rated (insulation contact), and the false confidence that adding more material fixes an air leak. We have found live knob-and-tube splices, exhaust fans venting into attics, and bathroom vents that terminate under insulation, pumping moisture into the fiberglass every shower. These conditions start fires or rot rafters.
What you can safely check: measure settled depth with a yardstick, photograph any labels you find, and look for obvious moisture or rodent damage from the attic hatch. Do not crawl deep into the attic without proper fall protection, and do not disturb anything electrical. If the job involves removal, air sealing with caulk and foam around live wiring, or working near the eaves, that is where our crew comes in. Call (737) 259-8352, and we will read your situation over the phone. Estimates are free, and we offer a Free Second Opinion on any written estimate you already have.
FAQs
How long does Johns Manville attic insulation last in Pflugerville?
Blown-in fiberglass lasts 20 to 30 years if it stays dry and undisturbed, but in Central Texas attics, the real lifespan is often 10 to 15 years due to contractor traffic, rodent activity, and the thermal cycling that breaks down paper facings. Call (737) 259-8352 for an attic inspection if your home is over a decade old.
Can it be repaired instead of replaced?
Spot repairs work for small, isolated damage, like a section disturbed by a solar installer. If the insulation is compressed, moisture-damaged, or rodent-contaminated, partial repair is false economy; the new and old material will not perform as a continuous thermal boundary. We will tell you which category you are in after a free inspection.
How long does a full replacement take?
Most Pflugerville attic jobs are one day: removal in the morning, air sealing midday, new insulation in the afternoon. Larger homes or attics with limited hatch access may run into a second day. We give you a written schedule with the price, not a guess.
Do you stock Johns Manville insulation, or is there a wait?
We carry Johns Manville, Owens Corning, Knauf, and CertainTeed on our trucks, so for standard R-values and coverage areas, we install same day or next day once the written price is accepted. Specialty orders for higher-density or formaldehyde-free batts take 3 to 5 business days. Call (737) 259-8352 to confirm stock for your specific R-value.
Written by Wes Okafor, Owner, Topside Attic Insulation Pflugerville at Topside Attic Insulation Pflugerville, serving Pflugerville and nearby areas.