Open cell, closed cell, or both
Spray Foam Insulation in Houma, LA
Keep the swamp air outside: one layer that seals and insulates, placed where a Houma house takes on heat and humidity.
- Free on-site estimates
- Written quote with material, depth and R-value for each area
- Leaks, moisture and termite signs checked before anything is covered
Why Foam Fits a Hot, Wet Climate
Spray foam insulation is mixed at the spray gun from two liquids, expands as it lands and hardens into a layer bonded to wood, metal or concrete. Since it grows into every seam, it does two jobs at once: it slows heat and it stops air. In Houma, where July highs average 91.3F and summer months bring 8 to 9 inches of rain, the air it stops is the real enemy. Hot, wet outdoor air leaking into a house makes the air conditioner work twice: once to cool it and again to pull the water out.
Closed cell vs open cell
Closed-cell foam cures dense and rigid. HomeGuide lists it at R-5 to R-7 per inch, and at normal thickness it slows water vapor and does not soak up water. Under a raised floor, on a metal building or anywhere that sees occasional wetting, it is our first choice.
Open-cell foam is soft and expands much more, filling rafter bays and wall cavities completely at a lower price per square foot. HomeGuide lists it at R-3.5 to R-3.7 per inch. It is the common choice for the underside of roof decks when an attic is sealed, and for interior walls. It lets vapor pass, so it stays away from places that can stay wet.
Sealed attics in south Louisiana
Many homes here have the air handler and ducts in the attic, which runs far hotter than the outdoor air on a summer afternoon. Spraying the roof deck instead of the attic floor brings that equipment inside the cooled space. It is not right for every house: the attic must be truly sealed, and combustion appliances and moisture control need a look. We walk through that before quoting a roof-deck job.
Can mold grow behind spray foam?
Mold needs moisture. Foam does not feed mold, but it will not dry out a leak either. If a roof, window or plumbing leak wets the framing, water can sit against the foam. That is why we check for leaks before we spray and why closed-cell foam goes where wetting is possible.
Code targets
Louisiana uses the 2021 International Residential Code, and the whole state is treated as climate zone 2. The Insulation Institute's summary lists R-38 ceilings and R-13 wood-frame walls for new homes. Foam reaches those targets in less depth than batts, which helps in shallow roof framing.
Get a free estimate or call (985) 466-8109 and we will come measure.
Where We Spray Foam
Spots in Terrebonne and Lafourche homes and buildings where foam usually earns its cost.
Roof decks for sealed attics
Open- or closed-cell foam under the roof so attic ducts and equipment run in conditioned air.
Raised floors
Closed-cell foam under homes on piers to stop humid air and heat coming up through the floor.
New walls and additions
Open stud bays sprayed before drywall to the R-13 wall value in Louisiana's code.
Rebuilt and repaired homes
Walls and roofs reopened after storm repairs sprayed while the framing is exposed.
Metal shops and buildings
Closed-cell foam on steel to stop condensation and heat gain.
Typical Spray Foam Insulation Costs
| Job | Range and source |
|---|---|
| Spray foam, installed | $1.50 to $5.00 per sq ft (HomeGuide) |
| Open-cell / closed-cell | $1.50 to $3.50 / $3.00 to $5.00 per sq ft (HomeGuide) |
| About 1,000 sq ft | $1,500 to $5,000 (HomeGuide); $3,150 to $7,500 existing home (Fixr) |
| Existing walls / new construction | $3.15 to $7.50 / $2.75 to $6.50 per sq ft (Fixr) |
| All exterior walls | $4,000 to $10,000 (HomeGuide) |
| Whole house | $8,000 to $20,000 (HomeGuide); $10,000 to $30,000 (Fixr) |
| Typical job minimum | $1,000 to $2,000+ (HomeGuide) |
These are national ranges from HomeGuide (2026) and Fixr (2025), not Houma bids. Foam type, depth, access and prep work drive the total, and small jobs often run into a minimum. The figure on your written estimate is the one you pay.
How a Spray Foam Job Runs
1. Inspection
We check the space for leaks, wet wood, termite signs and wiring, and measure every surface.
2. Written quote
Each area gets a foam type, thickness, R-value and price, plus any covering foam needs.
3. Prep and spray
We mask and cover, close off the work area, set up ventilation and spray in passes.
4. Cure and check
The house stays empty while foam cures; then we clean up and walk the job with you.
Why Choose Us for Spray Foam Insulation
Moisture checked first
Leaks and wet framing get found before foam can cover them.
Depth on paper
Inches and R-value for each surface are written on the quote.
Spray Foam Insulation Questions
Is spray foam worth it in Houma?
In the right places, yes: sealed roof decks with attic ducts, raised floors, metal buildings and new walls. For a plain attic floor with no ducts, sealing and blowing loose fill is usually the better value.
Can mold grow behind spray foam insulation?
Foam itself does not feed mold, but if a leak wets the wood behind it, moisture can sit there. We fix or flag leaks first and use closed-cell foam where wetting is possible.
How long do we stay out after spraying?
HomeGuide advises at least 24 hours away, longer if the product instructions say so. We ventilate the space and tell you when it is ready.
Which spray foam has the highest R-value?
Closed-cell, at about R-5 to R-7 per inch by HomeGuide's numbers, versus R-3.5 to R-3.7 for open cell.
Spray Foam Insulation Service Areas
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Get a Spray Foam Insulation Estimate
Tell us where the heat and humidity get in. We will measure and quote foam where it makes sense.