Johns Manville Radiant Barrier Installation Nationwide

Johns Manville Radiant Barrier Installation: The Pflugerville Owner’s Guide

Most Johns Manville radiant barrier installations in Pflugerville run between $1,800 and $3,400 for a typical 2,000-2,800 square foot attic, and we can usually get a crew out same-day or next-day. We stock JM-certified barrier rolls and the foil-faced sheathing tape on every truck, so we’re not waiting on a supplier run while your attic hits 140 degrees. Homeowners usually figure out something’s wrong when their summer electric bill jumps $80-$120 over the previous year, or when they notice the second floor of their Pflugerville home won’t cool below 78 degrees even after dark.

Call (737) 259-8352

Which Johns Manville Models This Applies To

Johns Manville makes two radiant barrier product lines you’ll find in Central Texas attics: the AP Foil-Faced Polyiso rigid board, commonly used as roof deck sheathing in new construction around Pflugerville’s Stone Hill and Blackhawk subdivisions, and the ComfortTherm radiant barrier roll, which is stapled to rafter bottoms in retrofit jobs. The rigid board runs 4×8 sheets in R-values from R-6 to R-30; the roll product comes in 500-square-foot rolls with either double-sided or single-sided reflective facing.

To identify what you’ve got, check the printed edge tape or the stamp on the foil facing. AP Foil-Faced boards will show a “JM” logo with the R-value and a date code; ComfortTherm rolls have a lot number and facing orientation arrow. The critical compatibility gotcha in Pflugerville’s climate: double-sided barrier installed over unsealed top plates will trap moisture against the roof deck during our spring humidity spikes, and that’s where we see the most callbacks. Single-sided with the reflective face down is the right spec for vented attics here. We don’t push OEM-only; the JM tape is worth using for warranty continuity, but we also carry 3M 3350 foil tape that meets the same ASTM E84 flame spread rating and costs less per roll.

Signs Your Johns Manville Radiant Barrier Installation Is Failing

• Hot spots on your ceiling during afternoon hours. The reflective surface has oxidized or collected dust, dropping its emissivity below 0.05. In Pflugerville, this happens faster on north-facing roof sections where morning dew sits longer and pulls airborne particulate into the foil pores.
• Torn or sagging sections hanging from rafters. ComfortTherm is held with staple-grade caps; if the installer used standard insulation staples instead of the wider JM-spec caps, the weight of Texas humidity cycling pulls the barrier loose in 3-5 years.
• Water staining on the barrier facing or roof deck. This means your attic ventilation is out of balance with the barrier’s permeability. JM’s polyiso board is a Class I vapor retarder; if you don’t have adequate soffit-to-ridge airflow, condensation forms on the cold side during our February cold snaps.
• Insulation beneath the barrier is compressed or displaced. A failed barrier lets radiated heat hit the insulation directly, accelerating degradation. Blown cellulose under a failed ComfortTherm install in Pflugerville will settle 15-20% faster than it should.
• Your HVAC runtime has increased 25% or more year-over-year. The barrier isn’t doing its job of reflecting radiant heat back toward the roof deck. We measure this with a blower-door test - a pressurization reading that shows, in one number, how much air your building envelope is losing - and an infrared camera sweep to find exactly where the barrier has failed.

Before

After

Replacement Cost & What’s Included

The wide range on full re-barrier jobs comes down to three things: how much old barrier has to come out, whether we need to add or repair baffles to maintain soffit airflow, and if your attic has active rodent damage that needs addressing first. Every job starts with a written price - no work starts without it - and includes a Documented Photo Record of the space before, during, and after. On jobs where we’re also air sealing, you’ll get before-and-after blower-door numbers in a written report. The 365-Day Done Right Promise covers all completed work; if the barrier fails or pulls loose, we make it right.

DIY or Call Us?

There’s a short list of things a homeowner can safely check: verify attic ventilation (look for blocked soffit vents or a dead ridge vent fan), confirm the barrier facing direction with a flashlight, and photograph any tears or water staining for documentation. What you should not do is crawl across joists to staple new barrier, handle polyiso board on a pitched roof, or attempt to seal can lights from above without proper electrical lockout. Attic falls and electrical contact are real risks; the radiant heat alone in a Pflugerville attic in July can cause heat exhaustion in under 15 minutes.

We carry JM-compatible barrier, foil tape, and the correct staple caps on every truck. Call (737) 259-8352 and we’ll read your situation with you - free estimate, written price before any work starts.

FAQs