Open studs and finished walls
Wall Insulation in Baton Rouge, LA
The right fill for the wall you have, with the R-value written down.
- Free on-site estimates
- Written quote listing foam type, thickness and R-value per area
- Ducts, moisture and termite clearances checked before we insulate
Walls Leak More Than You Think
Wall insulation matters less than the attic in Baton Rouge, but a west wall in August can still radiate heat into a room for hours after sunset. Many older homes in the city have walls with little or nothing in them, and outlets, switches and baseboards leak air around the edges. Newer homes usually have batts, sometimes poorly fitted. How we insulate depends on whether the wall is open or finished.
Open walls: remodels, additions, new builds
When the studs are exposed, spray foam is fast and seals around wires, boxes and pipes. Louisiana's code summary lists R-13 for wood-frame walls in climate zone 2. Open-cell foam fills a 2x4 cavity and reaches that; closed-cell gets more per inch and adds stiffness, which some owners want in walls facing the weather. We trim the foam flush so drywall goes on flat.
Finished walls: dense-pack
Most finished walls are insulated by drilling small holes, from inside or outside, and blowing cellulose in at high density so it fills the cavity and does not settle. HomeGuide lists dense-pack at $1.60 to $4.20 per square foot. It is usually the more practical retrofit than injecting foam, and it slows air movement as well as heat. Blocking inside the wall, old knob-and-tube wiring and plaster lath all affect the plan, so we check before we quote.
Flood-damaged walls
After the 2016 flood, many homes around Baton Rouge were gutted to a few feet up the wall. If you are rebuilding walls after water, closed-cell foam in the lower part of the wall does not soak up water the way batts do. It will not make a wall floodproof, but it dries out with less to tear out. We talk through options with you before the drywall goes back.
Garages and shared walls
The wall between an attached garage and the house, and the floor of any room above the garage, deserve sealing as well as insulation, since they also keep fumes out. These are common add-ons to an attic or wall job. Get a free estimate
Wall Jobs We Do
Common wall work and the material we usually use.
Open-cell foam in studs
Remodels and additions where the studs are exposed.
Closed-cell foam in studs
More R-value per inch and a stiffer wall where depth is limited or water is a risk.
Dense-pack cellulose
Drill-and-fill for finished walls with little or no insulation.
Garage shared walls
Sealing and insulating the wall between the garage and living space.
Flood rebuild walls
Foam choices for walls being rebuilt after water damage.
Published Wall Insulation Costs
| Job | Range and source |
|---|---|
| Spray foam, existing walls | $3.15 to $7.50 per sq ft (Fixr) |
| Spray foam, new construction / open studs | $2.75 to $6.50 per sq ft (Fixr) |
| All exterior walls, spray foam | $4,000 to $10,000 (HomeGuide) |
| Blown-in exterior walls | $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) |
Ranges here are national, from Fixr (2025) and HomeGuide (2025 and 2026). Wall height, access, siding or plaster, and how much patching is needed all change the price. The written estimate we send is the amount you pay.
How Wall Work Runs
1. Check the wall
Open or finished, wiring, blocking, siding and moisture.
2. Quote
Material, R-value and price by wall area.
3. Prep
Mask outlets and floors, or mark drill points for dense-pack.
4. Insulate
Spray and trim, or drill and fill.
5. Close up
Plug holes and clean up; patch work as agreed.
Why Choose Us for Wall Insulation
Retrofit options explained
Foam, dense-pack or batts, with the trade-offs in writing.
Flush trimming
Open walls are trimmed so drywall hangs flat.
Wiring checked
Old wiring is flagged before we fill a wall.
Wall Insulation Questions
Can you spray foam into existing walls?
Some injection foams are made for closed walls, but dense-pack cellulose is usually the simpler, lower-cost retrofit. We tell you which fits your walls after a look.
What R-value do walls need in Baton Rouge?
Louisiana's code summary lists R-13 for wood-frame walls in climate zone 2. The Department of Energy suggests R-13 for an uninsulated wood-frame wall in zone 2, or R-10 of exterior continuous insulation.
Is wall insulation worth it if my attic is done?
If the attic is sealed and insulated and walls are empty, walls are often the next step, especially on west and south walls. Done attic first, though; it usually pays more.
Do you patch the holes after dense-pack?
We plug and fill the holes. Paint matching or siding replacement is listed on the quote if it is part of the job.
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Get a Wall Insulation Estimate
Remodeling or just tired of a hot room? We will look at the walls and send a written price.