Spray Foam Insulation in Galveston, TX

Spray foam insulation in Galveston has a different job than it does inland. Wikipedia describes the island's climate as humid subtropical, with summer days regularly above 90F, nighttime lows around 80F and steady south and southeast winds carrying Gulf moisture ashore. Annual precipitation averages about 47 inches. Cooling and dehumidifying run most of the year, so the insulation and air sealing in a Galveston home are mainly about keeping heat and moist air out. We seal the leaks and insulate with open-cell or closed-cell foam where it makes sense, and with blown-in insulation where it reaches the same result for less.

What the Texas code asks for

OpenEI lists Galveston County in Climate Zone 2A. Texas applies the 2015 IECC with state amendments, effective September 1, 2016, according to the Insulation Institute's Texas summary, which lists R-38 for ceilings and R-13 for wood-frame walls in Zone 2. Cities can adopt stricter codes. For existing attics, the Department of Energy suggests R-49 to R-60 in Zone 2 when the attic is empty, or adding R-38 to R-49 over 3 to 4 inches of existing insulation, and R-13 for an uninsulated floor.

Raised homes and floors open to the wind

Raised houses are a familiar sight on the West End, at Jamaica Beach and along the Bolivar Peninsula, and FEMA notes that most of Tiki Island's roughly 950 homes stand on tall concrete pilings. The floor of those homes faces outdoor air on its underside, often with salt-laden wind blowing through. Batts stapled under the joists sag, get wet and blow loose. Closed-cell spray foam on the underside of the subfloor, or between the joists behind a protective covering, holds up much better because it sticks, seals the air and does not absorb water.

Attics, ducts and roof decks

In many Galveston County homes the air handler and ducts sit in a vented attic that can run far hotter than the outdoor air in summer. One option is to seal the ceiling and blow insulation deeper on the attic floor. Another is to spray foam on the underside of the roof deck, which brings the attic inside the building envelope so the ducts sit in cooler, drier air. We explain which fits your house and roof.

Closed cell vs open cell on the coast

Open-cell foam is soft and vapor-permeable, rated about R-3.5 to R-3.7 per inch by HomeGuide. It works well in walls and on many roof decks. Closed-cell foam is dense, rated about R-5 to R-7 per inch, resists water and adds rigidity. On the coast we lean toward closed-cell for raised floors, areas below base flood elevation, metal buildings and anywhere water could reach the foam. Your quote names the foam for each area and why.

After a storm

Hurricane Ike made landfall on Galveston Island in September 2008 as a Category 2 storm, and Harvey's rain flooded thousands of mainland homes in 2017. When water reaches insulation, it usually has to come out. Wet batts and loose fill hold water against framing, and open-cell foam soaks up water. We remove damaged material, let the structure dry, and reinsulate with materials suited to the risk.

Spray foam insulation cost

HomeGuide's 2026 guide puts installed spray foam at $1.50 to $5.00 per square foot overall: open-cell at $1.50 to $3.50 and closed-cell at $3.00 to $5.00. About 1,000 square feet of foam runs $1,500 to $5,000, a whole house $8,000 to $20,000, and many installers have a job minimum of $1,000 to $2,000 or more. Fixr's 2025 figures for existing homes are $3.15 to $7.50 per square foot. For a 2,000 square foot house, the cost depends on which surfaces get foam, not the floor area, which is why we measure first. The written estimate is your price.

Choosing among insulation contractors and companies

When you call spray foam insulation contractors or insulation companies in Galveston County, ask each one the same things. What gets sealed before insulating? Which foam goes where, and why? What thickness and R-value will be written on the quote? How will the attic or roof deck be ventilated or sealed? How will wet or damaged insulation be handled? How long should everyone stay out after spraying (HomeGuide advises 24 hours or more)? A company that answers clearly, in writing, is easier to compare. If your search for spray foam insulation near me turns up vague answers, keep looking.

We work across Galveston Island, from the East End historic districts to the raised homes of the West End and Jamaica Beach, and on the Bolivar Peninsula from Port Bolivar to Crystal Beach. On the mainland we serve Tiki Island, Hitchcock, La Marque, Texas City, Santa Fe, Dickinson, League City, Friendswood, Kemah, Clear Lake Shores, Bacliff and San Leon. The island and bay communities mean raised homes, salt air and flood rules; the mainland means slab homes, ducts in hot attics and neighborhoods that flooded in Harvey. Each town page covers what is different there.