Spray foam insulation creates an air seal and insulation layer in a single application — it expands to fill gaps and adheres to the surrounding surface, eliminating air infiltration that other insulation types can't address. Contractors in our network install both open-cell and closed-cell spray foam for homeowners and commercial properties throughout Lewisville and Denton County.

Lewisville sits in Denton County along the shore of Lewisville Lake, and its housing stock spans a wider range of construction eras than many of its newer DFW neighbors — an older, more established core built through the mid-to-late 20th century, alongside substantial newer development along the Highway 121 and I-35E corridors as North Texas growth pushed outward from Dallas. Older Lewisville homes, particularly in neighborhoods closer to Old Town, commonly carry attic insulation typical of 1960s-80s construction — a meaningful step below current recommendations for North Texas's climate. Denton County sits on Blackland Prairie clay similar to the rest of central DFW, and shares the Metroplex's seasonal pattern of hot, humid summers followed by sharp winter cold fronts. Lewisville's mix of an older lake-town core and newer corridor development gives it a genuinely layered insulation profile — closer in character to established cities like Carrollton and Irving than to newer, more uniformly recent-construction suburbs like Murphy or Kyle.

Open-Cell vs. Closed-Cell Foam

Open-cell foam has a lower R-value per inch (around R-3.5) but is less expensive and expands aggressively to fill cavities. It's vapor-permeable, which makes it appropriate for some wall applications in this climate. Closed-cell foam has a higher R-value per inch (around R-6-7), is rigid, and acts as a vapor barrier — it's the right choice for crawl spaces, exterior walls in high-moisture areas, and unvented attic assemblies. We recommend the right type for your specific application.

Some rooms are noticeably harder to heat or cool than others

Uneven temperatures between rooms, especially rooms above or below an attic, are a common sign of insufficient or unevenly distributed insulation.

Noticeably higher heating and cooling bills than similar-sized homes nearby

This is one of the more measurable signs that a home is losing conditioned air faster than it should — worth a comparison before assuming it's just an old HVAC system.

Ice dams forming on the roof edge in winter, or a hot, stuffy attic in summer

Both point to heat escaping into the attic space rather than staying inside the living area — a classic insulation-and-ventilation combination issue.

When Spray Foam Is the Right Choice

Spray foam is particularly valuable when air sealing is the primary goal, when you're insulating unusual shapes or hard-to-access cavities, when you need insulation in a vented or conditioned crawl space, or when you're doing an unvented attic assembly. It's generally more expensive than blown-in or batt insulation per square foot — we'll tell you when the premium is justified.

Have Questions?

We're happy to walk through your situation before you commit. Call us and we'll tell you honestly whether an upgrade makes financial sense for your home.

Call (469) 210-0277

This content is reviewed by the Texas Insulation Pros editorial team and informed by licensed-contractor sourcing, manufacturer documentation, and established industry standards for Insulation. Read our editorial standards.