Open walls and finished walls
Wall Insulation in Houma, LA
Whether your walls are open for repairs or closed up for decades, there is a way to fill them.
- 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
Two Kinds of Wall Jobs
Wall insulation in Houma tends to come in two kinds. The first is walls that are open: gutted after storm damage, reframed during a renovation, or new walls in an addition. The second is finished walls in older homes that have little or nothing inside them. Each calls for a different method.
Open walls
When the studs are exposed, spray foam is the most complete option. Louisiana's code summary lists R-13 for wood-frame walls in climate zone 2, which open-cell foam reaches in a standard 2x4 cavity while also sealing the gaps around outlets, pipes and the top and bottom plates. Closed-cell gives more R-value in tight spots and adds stiffness. Fixr lists spray foam in new or open walls at $2.75 to $6.50 per square foot. After Hurricane Ida, many homes in Terrebonne and Lafourche were opened up for repairs; that is the best time to do the walls right.
Finished walls
For closed walls, foam is usually not practical. Dense-pack cellulose, blown through small holes into each stud bay, is the common choice. HomeGuide lists dense-pack at $1.60 to $4.20 per square foot. We check each bay first for blocking and wiring, and patch the holes when done.
Moisture in walls
In a humid climate, walls have to be able to manage water. We do not recommend insulating behind wet or rotted sheathing, and we look for plumbing and window leaks before filling a wall. Exterior walls exposed to wind-driven rain should have their siding and flashing in good shape first.
Sound
Open-cell foam and dense-pack both cut sound between rooms and from outside. Many homeowners add interior walls to the job for that reason.
Get a free estimate or call (985) 466-8109 to talk about your walls.
Wall Work We Do
Wall insulation jobs we quote in Terrebonne and Lafourche.
Open-wall spray foam
Foam in exposed stud bays during repairs, remodels and additions.
Dense-pack finished walls
Cellulose blown into closed walls through small holes.
Interior sound walls
Open-cell foam or dense-pack between bedrooms, baths and living areas.
Garage and kneewalls
Walls between the house and unconditioned spaces sealed and insulated.
Typical Wall Insulation Costs
| Job | Range and source |
|---|---|
| Spray foam, existing walls | $3.15 to $7.50 per sq ft (Fixr) |
| Spray foam, open studs / new work | $2.75 to $6.50 per sq ft (Fixr) |
| All exterior walls, spray foam | $4,000 to $10,000 (HomeGuide) |
| Exterior walls, blown-in | $1,900 to $7,800, $1.10 to $3.70 per sq ft (HomeGuide); $2,000 to $4,000 (Fixr) |
| Dense-pack cellulose | $1.60 to $4.20 per sq ft (HomeGuide) |
| Open-cell / closed-cell | $1.50 to $3.50 / $3.00 to $5.00 per sq ft (HomeGuide) |
National ranges from Fixr (2025) and HomeGuide (2026 spray foam guide, November 2025 blown-in guide). Wall height, siding, access and patching change the total. We give you a written estimate, and that number is the price.
How Wall Jobs Go
1. Check the walls
We confirm what is in the walls, look for leaks and check wiring.
2. Choose the method
Foam for open walls, dense-pack for closed ones, written on the quote.
3. Install
Foam is sprayed and trimmed, or cellulose is blown to density.
4. Clean up
Holes are patched, trimmings removed, and the work checked with you.
Why Choose Us for Wall Insulation
Right method for the wall
Foam where walls are open, dense-pack where they are closed.
Leaks first
We will not bury a leak inside a wall.
Wall Insulation Questions
Can spray foam be added to existing walls?
Standard spray foam needs open cavities. For finished walls, dense-pack cellulose through small holes is the usual approach.
What R-value do walls need in Louisiana?
The Insulation Institute's summary of Louisiana's 2021 code lists R-13 for wood-frame walls in climate zone 2.
We are repairing storm damage. Should we foam the walls?
If the walls are open, it is the best time. Foam seals as it insulates, and it costs much less than retrofitting later.
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Get a Wall Insulation Estimate
Walls open for repairs or closed for decades, we will tell you the best way to fill them.