San Antonio and the Texas Hill Country
Spray Foam Insulation in San Antonio and the Texas Hill Country
FoamLine Insulation seals attics, metal buildings, barndominiums and commercial roofs with open cell and closed cell spray foam. Every job ends with a completion report: depth readings, photos and the product used, so you can see exactly what you paid for.
- Free estimates
- Open and closed cell
- Completion report on every job
- Residential, commercial, industrial
What we insulate
Pick the job that looks like yours.
Attic spray foam
Seal the hottest room in the house. Foam on the roof deck or a deeper attic floor, measured and documented.
Learn moreMetal buildings and shops
Closed cell foam that stops condensation and drip on metal walls and roofs.
Learn moreBarndominiums
Foam for barndos and casitas from Boerne to Fredericksburg, scheduled around your drywall date.
Learn moreSpray foam roofing
Seamless foam roofing for flat and low-slope commercial roofs, often over the existing roof.
Learn moreCommercial and industrial
Warehouses, churches, restaurants and process buildings, worked around your operating hours.
Learn moreInsulation removal
Old, wet or rodent-damaged attic insulation taken out before new insulation goes in.
Learn moreSealed right, proven on paper
Most insulation jobs end with a handshake and an invoice. Ours end with a report. When the crew finishes, you get the foam type, the depth we measured across the job, before and after photos, and the re-entry instructions for your home.
If something looks off, the report shows it, and we come back and fix it.
How a job runs
- Tell us about the project. Two minutes online. We call or text back within one business day.
- Site visit. We measure, check moisture and ventilation, and look at what is there now.
- Written proposal. Open cell or closed cell, depth, square footage and price, in writing.
- Clean install. Protected work area, ventilation during and after, clear re-entry time.
- Completion report. Readings and photos, sent to you the same week.
Why spray foam in South Texas
San Antonio attics bake. Standard attic floor insulation slows heat, but air still moves through gaps around lights, vents and top plates. Spray foam expands into those gaps and stops the air movement as well as the heat, which is why it is common on new custom homes and on metal buildings across the Hill Country.
It is not the right answer for every home, and it is not the cheapest insulation. During the site visit we tell you plainly whether foam, blown-in insulation or a mix makes the most sense for your building and budget.
Money worth knowing about
- CPS Energy rebate: CPS Energy pays up to $0.35 per square foot for contractor-installed attic insulation that meets its rules, for projects completed February 1, 2026 through January 31, 2027. See if your project qualifies.
- Federal tax credit: the federal 25C credit for insulation ended for work placed in service after December 31, 2025. Some companies still advertise it. We will not.
Sources: CPS Energy ceiling and attic insulation rebate page; Instead: what Section 70505 ended for the 25C credit.
Where we work
San Antonio and the Texas Hill Country, including Boerne, New Braunfels, Helotes, Bulverde, Spring Branch, Canyon Lake, Fair Oaks Ranch, Schertz, Cibolo, Kerrville, Fredericksburg, Comfort and Bandera. See the full service area.
Common questions
How much does spray foam insulation cost?
It depends on square footage, open or closed cell foam, and how thick it goes on. National material costs run about $0.44 to $0.65 per board foot for open cell and $1 to $1.50 for closed cell, before labor (Fixr, January 2025). We give you a written price after a site visit. Read the cost guide.
Do I have to leave my house?
Yes, for a short time. Federal guidance says to stay out during the install and for at least 24 hours afterward unless the product maker says otherwise. We ventilate the work area and tell you the exact re-entry time before we start. See our clean install protocol.
Open cell or closed cell?
Open cell is lighter and less expensive and works well under roof decks in many homes. Closed cell is denser, adds strength and blocks moisture, which makes it the usual pick for metal buildings and roofing. Compare them side by side.
Do you work with builders?
Yes. We schedule new construction around your drywall date and provide inspection-ready documentation. See the builder page.
Get a free estimate
Tell us about the project. We reply within one business day to set up a site visit.