Demilec Radiant Barrier Installation Nationwide

Demilec Radiant Barrier Installation: The Pflugerville Owner’s Guide

Demilec radiant barrier installation in Pflugerville typically runs $1,800-$3,400 for an average attic, depending on square footage and whether we need to pull existing degraded material first. We stock Demilec-compatible radiant barrier rolls and tape on every truck, and most installs are completed same-day once the attic floor is sealed. Most homeowners in Pflugerville figure out something’s wrong when their second-floor rooms won’t cool below 78°F in July despite the AC running nonstop, or when they pull down attic stairs and find the existing barrier has turned to silver dust on the joists.

Call (737) 259-8352

Which Demilec Models This Applies To

Demilec does not sell radiant barrier as a standalone branded SKU like their spray foam systems. What Pflugerville homeowners are usually holding is a Demilec-specified assembly: either a hybrid job where Demilec spray foam was applied to the roof deck and a radiant barrier was layered over or under it, or a retrofit where the original installer used Demilec’s recommended barrier weight and tape system. The critical identifier is the existing material’s mil thickness and whether it was fastened with Demilec-specified foil tape or generic HVAC tape, which fails differently.

We see three common configurations in Pflugerville homes built 2015-2022: single-sided foil laminated to woven polyethylene (typically 4.8-6.0 mil), double-sided foil with bubble-core center (8.0-10.0 mil), and perforated “breathable” barrier installed over unvented conditioned attics. The compatibility gotcha: Demilec’s closed-cell spray foam on the roof deck needs a perforated barrier or no barrier at all; installing standard solid foil over it traps moisture and voids the foam warranty. We verify this on every job by checking the roof deck assembly before we cut a roll. OEM-grade Demilec-specified barrier runs heavier than the Reflectix-branded rolls you’ll find at the big-box stores in Round Rock; the weave count and UV resistance are different, and we source from the same industrial distributors that supply Demilec-certified installers.

Signs Your Demilec Radiant Barrier Installation Is Failing

• Second-floor rooms run 6-10°F hotter than downstairs by mid-afternoon. The radiant barrier’s reflective surface has oxidized or collected dust, dropping its emissivity below 0.05. In Pflugerville, where attic temps hit 140°F regularly from May through September, a degraded barrier stops reflecting radiant heat and becomes a conductor.
• Your AC runs 30-45 minutes longer per cycle than it did three years ago. The barrier may have pulled away from fasteners, creating gaps where infrared heat passes straight through. We find this often in the Stone Hill Town Center corridor, where seasonal humidity swings cause staple pops.
• You see silver dust or foil flakes on insulation below. The polyethylene backing has UV-degraded. This happens faster in Texas attics than the manufacturer spec suggests; we’ve pulled 7-year-old barrier in Pflugerville that was rated for 10.
• Tape seams are lifting or the barrier is sagging between joists. Demilec-specified foil tape has an acrylic adhesive rated for 200°F; generic substitutes soften at 150°F and release. Once a seam opens, convective airflow behind the barrier renders it useless.
• Moisture staining on the roof deck or rafter tails. This indicates a vapor-trap condition, usually solid foil over unvented foam without perforation. The barrier isn’t just failing; it’s actively damaging the assembly. This requires immediate assessment.

Before

After

Replacement Cost & What’s Included

We don’t install barrier over unsealed attic floors. The price range above includes the barrier material, Demilec-compatible foil tape, mechanical fasteners, and labor. If we need to remove existing material first, that’s line-itemed separately. Every job gets a Written Price Before Any Work Starts under Haven Standard Clause 1, and the 365-Day Done Right Promise covers installation defects including seam failure or fastener pull-through. We publish before-and-after blower-door numbers on every job where air sealing is performed, so you can verify the envelope improvement in CFM50, not just feel it.

DIY or Call Us?

There’s nothing inherently dangerous about radiant barrier material itself; it’s lightweight foil and plastic, not high-tension or electrical. Where DIY goes wrong in Pflugerville attics is the environment, not the product. Attic temperatures exceed 130°F from June through September, and a homeowner working on joists in that heat makes mistakes: stepping through drywall, misjudging fastener spacing, or using HVAC tape that’ll release in six months. The bigger risk is installing the wrong barrier type over an existing Demilec foam assembly and trapping moisture against the roof deck.

What you can safely check: identify your existing barrier type (single-sided, double-sided, or perforated), note any tape brand visible on seams, and photograph the roof deck from the attic hatch. What we handle: matching the correct barrier to your specific assembly, running the blower-door test before and after, and documenting the result. Call (737) 259-8352 and we’ll read your photos with you, no charge.

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