Straight answers about spray foam in Houston
What it costs, which foam goes where, what the code actually says, and what to ask before you hire anyone. Written by the people who spray it, for the people who are about to pay for it.
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Does your attic insulation need to come out?
Usually not. Clean dry insulation gets topped up instead. Five cases where removal is necessary, and one where nobody should touch it.
Does a radiant barrier actually work in Houston?
Yes, within limits nobody selling foil will tell you. It has no R-value, it fails completely without an air gap, and it belongs on top of real insulation.
Blown-in or spray foam for a Houston attic?
One question decides it, and most companies will not ask you. Where your ductwork runs matters more than R-value, cost or anything on a brochure.
How much will spray foam save on my Houston electric bill?
The 15% figure contractors quote is a national average. ENERGY STAR puts Houston's climate zone at 9%. Why the real Houston lever is your ductwork.
Can you spray foam a crawl space in Houston?
A Houston crawl space is a closed-cell job, but the foam usually belongs under the floor, not on the walls. What code and termites decide here.
Are there rebates or tax credits for spray foam insulation in Houston?
No federal credit for 2026 insulation work, and CenterPoint's Houston program does not list spray foam. What a Houston homeowner can actually claim.
How is warehouse spray foam priced, and can it be done while we operate?
Warehouse foam is bid by board foot against your spec, not by the square foot. How phasing, ventilation and reentry work in a building still shipping.
Does spray foam need a thermal barrier in Houston?
Spray foam is a foam plastic and it burns. Houston is on the 2021 IRC and IBC: a thermal barrier over the foam, or an ignition barrier in an attic.
What does it cost to insulate a metal building in Houston?
Metal building foam is priced by the board foot, not the square foot. Run your own shop through the takeoff and see what moves the number on steel.
Does spray foam insulation keep rats and mice out of an attic?
Spray foam is not pest control, but it removes the nesting material and seals the gaps rodents use. What actually keeps rats out of a Houston attic.
How do you choose a spray foam insulation contractor in Houston?
Texas does not license insulation contractors, so "licensed" means little. Eight things to ask a Houston spray foam company before you sign.
What does it cost to spray foam a 2,000 square foot house in Houston?
Your floor area is not the number we price. How a 2,000 square foot Houston house becomes a real roof deck area, and what that costs installed.
How much does spray foam insulation cost in Houston?
Real installed Houston prices: open-cell about $2.50 to $3.50 per square foot, closed-cell $3.50 to $5.00, and a typical attic $4,000 to $10,000.
Open-cell or closed-cell spray foam for a Houston home?
Open-cell is the usual choice for Houston attic roof decks. Closed-cell belongs in crawl spaces, metal buildings and near the coast. How to decide.
What R-value does Houston code require in the attic?
Houston sits in IECC Climate Zone 2A. The attic minimum is R-38 or R-49 depending on the code edition your city enforces, and foam at the deck meets it.
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