Spray Foam Insulation in Baton Rouge, LA

Spray foam insulation in Baton Rouge has one main job: keep heat and humid air out of a house that runs its air conditioning most of the year. Wikipedia's figures for the city show average relative humidity near 74% across the year and about 62 inches of rain, with a July average temperature around 83F and a record high of 110F. A house that leaks attic air or sucks damp air up from below pays for it every summer day. We are spray foam insulation contractors who seal those leaks and insulate the spaces that need it, using open-cell or closed-cell foam where it fits and blown-in insulation where it does the job for less.

What the code asks for here

Louisiana uses the 2021 International Residential Code, and for energy purposes the whole state is treated as climate zone 2. The Insulation Institute's summary of that code lists R-38 for ceilings and R-13 for wood-frame walls. Those are minimums for new work. For existing homes, the Department of Energy suggests more: in zone 2, an attic with no insulation should reach R-49 to R-60, and one that already has 3 to 4 inches should get another R-38 to R-49. Many older Baton Rouge homes fall well short of either number, and the gap shows up as an upstairs that never cools and an air handler that runs nonstop.

Where houses here lose the fight

In most local homes the air handler and ductwork sit in the attic, the hottest space on the property. Leaky ducts pull attic air into the system and push cooled air into the attic. Gaps around recessed lights, bath fans, plumbing stacks and the attic hatch let conditioned air escape. Raised houses add a second problem below the floor: an open, vented crawl space that pulls in humid outside air, which then condenses on cool ducts and floor framing. Slab homes skip the crawl space but still lose the attic battle.

Foam is one way to fix this. Closed-cell or open-cell foam sprayed under the roof deck turns the attic into a semi-conditioned space, so the ducts and air handler sit in mild air instead of 130-degree air. Sealing the attic floor and blowing loose fill to depth is the other way, and it often costs less. We show you both when both would work.

Closed cell vs open cell

Open-cell foam is soft and light, expands a lot, seals air well and runs about R-3.5 to R-3.7 per inch according to HomeGuide. Closed-cell foam is dense and rigid, about R-5 to R-7 per inch, and at normal thickness it slows water vapor and does not soak up water. In Baton Rouge attics, open-cell under the roof deck is common because it fills deep rafter bays at a lower price. Closed-cell earns its higher cost in crawl spaces, on metal buildings, on rim boards and in places that may see water, since it does not wick it up.

Flood history and insulation

The August 2016 flood put water into tens of thousands of homes around the capital region, and Hurricane Gustav in 2008 brought winds over 100 mph. Insulation that got wet in a flood or a roof leak usually loses its value and can hold moisture against framing. If you bought a home with a flood or storm history, or you are not sure what is in the walls and floors, we check what is there and tell you what should come out.

Termites and foam

LSU AgCenter calls the Formosan termite the most destructive insect in Louisiana and says it is found in about half of the parishes. Local building criteria list termite risk as very heavy. That matters for insulation: foam placed against a foundation or near the ground can hide termite tubes, so we keep inspection gaps where they belong and talk with you about your pest control contract before we foam a crawl space or slab edge.

Spray foam insulation cost

HomeGuide's 2026 guide puts installed spray foam at $1.50 to $5.00 per square foot: about $1.50 to $3.50 for open-cell and $3.00 to $5.00 for closed-cell. About 1,000 square feet runs $1,500 to $5,000, and many spray foam insulation companies have a job minimum of $1,000 to $2,000 or more. Fixr lists $3.15 to $7.50 per square foot for existing walls. Those are national ranges. Access, thickness, prep and removal of old material move the number, and the figure on your written estimate is the one you pay.

What to ask insulation contractors

Whether you search for spray foam insulation near me or ask a neighbor, a few questions sort out the careful insulation companies quickly. Ask what they will seal before they insulate. Ask which foam they plan for each area, at what thickness, and what R-value that gives. Ask what happens to the attic ventilation if they foam the roof deck, how they handle the crawl space vents, and how long you need to stay out after spraying (HomeGuide says to plan on at least 24 hours). We answer those on the quote.

Rebates worth checking

Entergy Louisiana's 2025 residential overview lists attic insulation, air sealing and duct sealing rebates under its Home Performance with ENERGY STAR program, run through Entergy Solutions. Amounts and rules change, so check with them before you schedule. If you are on a co-op or another utility, ask them what they offer.

We work in Baton Rouge and the towns around it: Baker, Zachary and Central to the north; Old Jefferson and Oak Hills Place on the southeast side; Denham Springs, Walker, Watson and Livingston across the Amite; Prairieville, Gonzales and St. Gabriel to the south; and Port Allen, Addis, Brusly and Plaquemine across the river. Older neighborhoods in the city and in towns like Plaquemine have more raised wood floors and thin attics. The fast-growing suburbs in Ascension and Livingston have newer slab homes with ducts in hot attics and bonus rooms over garages. Low ground near the Amite, the Comite and the Mississippi means flood history is always part of the conversation.