Your Dallas Attic Is Driving Your AC Bill. Spray Foam Seals It.

In the DFW market, open-cell spray foam runs $1.00–$1.60 per board foot installed and closed-cell runs $1.60–$2.60 per board foot. For a typical attic roof-deck application, most homeowners pay $2,000–$5,000, and a full residential project that adds garage or perimeter work generally lands in the $2,000–$6,000 range. We quote on a per-board-foot basis after we see your attic, so you know the total before we start.

Three things stack against DFW homeowners: extreme summer heat (attic temperatures reach 130–145°F from June through September), builder-grade fiberglass insulation spec'd to code minimum during the 1990s and 2000s building boom in Frisco, Plano, and McKinney, and a building envelope that was never designed with air sealing in mind. Conditioned air escapes through every penetration in the attic floor while radiant heat from the roof deck drives temperatures upward — so your AC runs longer and harder than it should.

Yes — and it's often the most cost-effective time to do it. Spray foam applied during framing (before drywall) can be sprayed directly to the roof deck for an unvented conditioned attic, which eliminates the attic as a thermal liability entirely. New construction in Frisco, McKinney, and Allen is subject to Texas energy code — but code is a floor, not a ceiling. Homes built to a higher air-tightness standard operate for meaningfully less over the life of the mortgage.

Yes — they solve different problems and work well together. A radiant barrier (reflective foil on the rafters) slows radiant heat transfer from the hot roof deck. Spray foam air-seals and adds R-value. In a DFW attic reaching 130–145°F you benefit from both: the radiant barrier knocks the roof deck temperature down and spray foam stops conditioned air from leaking through the assembly. Homes with only a radiant barrier and fiberglass still lose significant energy to air infiltration.

Most DFW residential attic roof-deck jobs are completed in a single day. A standard application on an 1,800–2,200 sq ft single-story home typically runs a few hours. Larger homes with complex framing or restricted access may extend into a second day. We schedule early-morning starts in summer to beat peak attic heat. Foam cures within 24 hours and the space can be used normally after that.

DFW homeowners typically see 20–40% lower heating and cooling costs after air sealing and insulation, depending on the home's starting condition. With summer electric bills in the area running $220–$350 a month, that adds up quickly. Oncor delivers power across most of the Metroplex and retail providers in the deregulated Texas market periodically offer rebates for qualifying insulation upgrades — we help you identify what applies at estimate time. Note that the federal 25C tax credit expired on December 31, 2025, so utility-side incentives are the real opportunity now.