Knowledge Base
Straight answers to the questions South Texas homeowners and builders ask us most. Have a question that isn't here? Ask us directly.
Spray foam insulation in South Texas typically costs $1.50 to $4.50 per board foot installed. Open cell foam runs $0.50–$1.50 per square foot and closed cell runs $1.00–$2.50 per square foot. The total depends on thickness, square footage, and accessibility. DTF Spray Foam provides free written estimates so there are no surprises.
Yes — typically 2–3× the upfront cost of fiberglass batts. However, spray foam delivers 30–50% energy savings, lasts 80+ years, and never needs replacement, which makes the lifetime cost lower than fiberglass that must be re-installed every 15–20 years.
DTF Spray Foam works with several financing partners and can discuss payment options during your free estimate. Many South Texas homeowners also qualify for federal energy-efficiency tax credits (up to $1,200/year) and local utility rebates that offset the cost.
Most South Texas homeowners recover the cost of spray foam in 4–7 years through reduced cooling bills. After payback, the savings continue for the 80+ year life of the foam.
Open cell foam is softer, less dense (about 0.5 lb/ft³), and offers an R-value near R-3.7 per inch. Closed cell foam is rigid, denser (about 2 lb/ft³), reaches R-6.5 per inch, and acts as a moisture and vapor barrier. Closed cell is preferred for metal buildings and humid South Texas climates.
Department of Energy guidelines for South Texas (Climate Zone 2) recommend R-30 to R-49 in attics and R-13 to R-21 in walls. With closed cell spray foam at R-6.5 per inch, you reach R-30 in just 4.5 inches — far thinner than the equivalent in fiberglass.
Closed cell spray foam is a Class II vapor retarder at 1 inch and a Class I vapor barrier at 1.5+ inches — it stops both air and moisture. Open cell foam blocks air infiltration but allows vapor to pass, which is ideal for some wall assemblies. We recommend the right product for your specific application.
Properly installed spray foam insulation lasts 80 years or longer without sagging, settling, or losing R-value. It is one of the most durable insulation products available and typically outlasts the building it is installed in.
Most residential jobs take one day. A 2,000 sq ft home with attic spray foam is typically completed in 6–10 hours. The foam cures within an hour of application, so the home is ready for normal use the same day.
Yes, we recommend occupants and pets leave the work area during application and for 24 hours after, while the foam fully cures and ventilation clears. This is standard industry practice for any spray foam installer.
Yes. Spray foam is commonly retrofitted into existing attics, crawl spaces, rim joists, and accessible wall cavities. For closed walls, we may use injection foam or recommend opening targeted sections. We assess every retrofit during the free estimate.
No. Properly installed open or closed cell foam to the underside of the roof deck does not damage shingles or void most manufacturer warranties. We follow industry best practices and ventilation guidelines for unvented attic assemblies.
Yes. South Texas homeowners typically cut cooling bills 30–50% after spray foam installation because the airtight seal stops the hot, humid attic air that overworks AC systems. Most homeowners recover the investment in 4–7 years through energy savings.
Yes. By sealing air leaks, spray foam dramatically reduces the amount of humid outside air entering your home — which is critical in South Texas summers. Closed cell foam adds a vapor barrier for even greater moisture control.
Often, yes. Homes insulated with spray foam frequently need 25–40% less cooling capacity. If you're building new or replacing your HVAC, spray foam can save you thousands on a smaller, right-sized system.
Yes. Once cured (within 24 hours of installation), spray foam is inert and chemically stable. It does not off-gas, harbor mold, or attract pests. DTF Spray Foam uses certified low-VOC formulations and follows ventilation protocols during application.
Spray foam meets ASTM E-84 fire-spread standards but, like wood framing, must be covered with a thermal barrier (typically drywall) in living spaces. In attics, an ignition barrier coating may be applied. We handle code compliance on every job.
Yes. We provide a workmanship warranty on every installation, and the foam itself carries the manufacturer's lifetime material warranty. Specifics are reviewed in writing before any work begins.
Yes. DTF Spray Foam is a fully licensed and insured spray foam insulation contractor based in Pleasanton, TX. We carry general liability and workers' compensation coverage on every job.
Yes. Closed cell spray foam is ideal for metal buildings, shops, and barndominiums because it adheres directly to steel, eliminates condensation, adds structural rigidity, and stops radiant heat transfer through metal panels.
DTF Spray Foam serves South Texas, including Pleasanton, Floresville, Poteet, Natalia, Somerset, Devine, Jourdanton, Hondo, Castroville, Stockdale, Pearsall, Dilley, and Bigfoot — covering Atascosa, Wilson, Medina, Frio, and McMullen counties.
Call us or request a free, no-pressure estimate. We answer every question in writing before we start work.
