Demilec Attic Insulation Nationwide

Demilec Attic Insulation: The Austin Owner’s Guide

If you’re looking for Demilec attic insulation in Austin, here’s the straight answer: Woolsey Insulation Austin stocks and installs Demilec spray foam products, and most attic jobs run between $1,800 and $4,200 depending on square footage and foam type. We can typically get a crew to your home within a few days, and every quote is a written price before any work starts. The way most Austin homeowners discover their Demilec insulation has failed is subtle: a room that won’t hold temperature, an electric bill that climbs in July, or foam that has pulled away from the roof deck. Glenn Hartley and our crew have spent enough time in Austin attics to know that Demilec products, when installed correctly, hold up well – but when they fail, the signs are usually written in your energy bill.

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Which Demilec Models This Applies To

The two Demilec lines we service most in Austin are Heatlok HFO and Sealection 500. Heatlok HFO is a closed-cell foam – meaning each tiny bubble in the cured foam is sealed shut, which gives it a higher R-value per inch, around R-7.0. Sealection 500 is open-cell, which means the bubbles are interconnected, giving it roughly R-3.7 per inch but better sound dampening. Here’s the compatibility gotcha: these two products are not interchangeable in the same application. If your attic was sprayed with open-cell and you have a section that failed, patching it with closed-cell creates a condensation point where the two foams meet. That’s a moisture problem waiting to happen in Austin’s humidity. When you’re identifying what you have, look for the foam’s texture – open-cell feels spongy and soft, while closed-cell is rigid and dense. There may also be an MSDS label near the attic access or a tag on the original work order. As an independent service provider, we’re not affiliated with Demilec directly, but we work with their products because we’ve seen how they perform in Texas heat. For most failed sections, we recommend matching the original product exactly. We also stock Reflectix for radiant barrier applications, but Demilec spray foam is the workhorse for attic insulation in this climate.

Signs Your Demilec Attic Insulation Is Failing

• Temperature swings between rooms. When foam pulls away from the roofline or a section was missed during the original install, heat finds the gap. You’ll notice one bedroom that’s always five degrees warmer than the hallway, and it won’t matter how low you set the thermostat.
• Higher summer electric bills. Austin’s August heat is brutal on attics. If your July bill jumped 20% or more compared to last year and your usage habits haven’t changed, the insulation isn’t doing its job.
• Visible gaps or shrinkage in the foam. Demilec foam should be fully adhered to the substrate. If you look up in your attic and see foam that has separated from the roof deck or foam that has yellowed and become brittle, that’s a sign of improper mixing during installation or age-related breakdown.
• Musty smell or damp spots. Open-cell foam, if exposed to roof leaks, will absorb water. Closed-cell repels water. A musty attic smell combined with soft spots in foam usually means water intrusion into open-cell product.
• Pest activity in the attic. Demilec foam doesn’t attract pests, but gaps in the insulation give rodents and insects an entry point and a nesting area. If you’re hearing scratching in the ceiling, the insulation barrier has been compromised somewhere.

Replacement Cost & What’s Included

In Austin, removing and replacing failed Demilec attic insulation most often lands between $2,200 and $4,200 for a typical 1,500 to 2,000 square foot attic. Smaller patch jobs – where only a section of foam has failed – can run $400 to $900. The big driver is whether we’re doing a full removal or a patch, and whether the original product was open-cell or closed-cell. Closed-cell is more expensive per board foot, but you get double the R-value per inch. Here’s what separates Woolsey from the price-at-the-door crowd in Austin: when you call us for a Demilec insulation job, Glenn or one of our technicians walks the attic, measures the space, and puts a written price in your hand before any work starts. No adjustments when the crew arrives, no surprise line items. That’s The Kingswell Way, and it’s been how we’ve operated since 2002 as part of the Kingswell family of independently owned and operated insulation companies. Every Demilec replacement job includes our 365-Day Done Right Promise in writing: if the foam fails or the job isn’t right within 365 days, we come back and fix it at no charge. Parts and labor, all of it.

DIY or Call Us?

Spray foam insulation – Demilec or any other brand – is not a weekend DIY project. The two-part liquid mixture requires precise temperature control, proper mixing ratios, and professional equipment. The isocyanate component, in particular, is hazardous if inhaled during application, which is why we wear full respiratory protection and tyvek suits on every spray job. What you can safely do is an inspection: look for visible gaps, check for water stains on the roof deck, and note where the foam feels soft or brittle. If you can feel a hot spot in your house, there’s a reason – and it’s usually something we can fix. For anything beyond a visual inspection, the honest answer is to call us. We’ll come out, assess what failed, match the Demilec product to the original application, and give you a number that won’t change. Call (361) 418-9997 and a live person answers – 24 hours a day, every day. No voicemail maze.

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