Demilec Attic Insulation Nationwide

Demilec Attic Insulation: The Cedar Park Owner’s Guide

Demilec attic insulation replacement in Cedar Park typically runs $2,800-$5,400 for a complete removal and reinstall in a 2,000-square-foot home, and we stock Demilec-compatible materials for same-day starts on most jobs. Most homeowners figure out something’s wrong when their upstairs bedrooms won’t cool below 78°F in July or their electric bill jumps 30% year-over-year despite the thermostat never moving. We see this pattern constantly in Cedar Park homes built between 2005 and 2015, where the original Demilec open-cell foam has shrunk, pulled away from rafters, or developed thin spots that let conditioned air bleed straight into the attic.

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Which Demilec Models This Applies To

Demilec doesn’t sell attic insulation by traditional model numbers the way an HVAC manufacturer does. Instead, you’re looking for product-line markings on the foam itself or on any original installation paperwork. The two lines we encounter in Cedar Park are Demilec Heatlok HFO High Lift (the closed-cell spray foam, identifiable by its higher density and orange-ish cure color) and Demilec Sealection 500 (the open-cell water-blown foam, lighter and more common in suburban Texas builds from the mid-2000s through about 2018).

To identify what you have, check for a Demilec lot tag stapled to a rafter or a specification sheet in your builder packet. If the foam is crumbling, yellowed, or pulling a quarter-inch gap from the framing, you likely have early-vintage open-cell that didn’t get the humidity control it needed. We also carry Owens Corning, Johns Manville, Knauf, Rockwool, CertainTeed, Icynene, and GreenFiber - no proprietary lock-in, so if Demilec isn’t the right fit for your repair, we match the material to the assembly, not the other way around.

Topside Attic Insulation Cedar Park is an independent service provider - not affiliated with Demilec - and we source materials based on what the building science calls for, not brand loyalty.

Signs Your Demilec Attic Insulation Is Failing

• Hot second-floor rooms that the AC can’t catch. When open-cell Demilec shrinks or separates from rafters, the thermal envelope gets perforated. Conditioned air escapes upward, and radiant heat from the roof deck - which reads 140°F or higher in Cedar Park attics during August - pushes back down. Your HVAC runs longer for the same result.
• Spiking electricity bills with no rate change. A blower-door test on a home with compromised attic foam often shows infiltration numbers double what they were at install. We measured one Buttercup Creek home at 3,800 CFM50 when it should have been under 2,000 after air sealing - the foam had pulled back from top plates and can-light penetrations.
• Visible gaps or thin spots in the foam surface. Demilec open-cell should present as a continuous, slightly textured layer. If you can see rafter bays through it, or if probing with a screwdriver reveals soft, powdery material underneath a thin skin, the foam has degraded. This happens faster in Cedar Park’s combination of high summer attic temps and winter humidity swings.
• Moisture staining on drywall ceilings below the attic. Failed foam stops blocking humid outside air. When that moist air hits cool conditioned surfaces, condensation forms. We find this most often above bathrooms and kitchens, where stack effect pulls air hardest through the envelope.
• Dust or allergen issues that started recently. Gaps in attic foam let attic air - which carries fiberglass particles, rodent debris, and pollen - get pulled into living spaces through recessed lights and ceiling penetrations. If your HVAC filters are clogging faster than they used to, the envelope is leaking.

Replacement Cost & What’s Included

Most complete Demilec attic insulation removals and replacements in Cedar Park run between $2,800 and $5,400 for a typical single-family home, with the final price driven by three factors: how much failed material needs removal (open-cell comes out faster than dense closed-cell), whether the roof deck needs remediation for moisture damage, and what replacement assembly we specify. A partial repair - feasible if only one section failed, say above a garage conversion - might land in the $1,200-$2,100 range.

Every job includes removal of failed foam, HEPA-contained cleanup, air sealing of top plates and penetrations before new insulation goes in, and installation of the replacement material. We also run a blower-door test - a pressurization reading that shows, in one number, how much air your building envelope is losing - before and after, so you get documented proof of the performance change. Under Haven Standard Clause 1, you get a written price before any work starts, a written scope, and a written warranty. The 365-Day Done Right Promise covers all completed work.

DIY or Call Us?

There’s a short list of things a Cedar Park homeowner can safely check: confirm the product line from any visible tags, photograph gaps or thin spots for reference, and verify whether the attic access is clear. What you should not do is attempt removal yourself. Demilec foam, especially closed-cell, requires mechanical scraping and proper respiratory protection - the isocyanate exposure risk is real, and attic ventilation is rarely adequate for unprotected work. We’ve also found live electrical junctions buried in foam and brittle flex duct that tears if you look at it wrong.

Seal the leaks first. Then insulate. The order matters more than the product. If your Demilec foam is failing, call (737) 245-6428. We’ll read your situation, give you a written price, and if you have a competing quote, we’ll review it with you line by line - free second opinion, no obligation.

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