Spray Foam Insulation in West Palm Beach, FL

Spray foam insulation in West Palm Beach is about keeping heat and humidity out for most of the year. Wikipedia classifies the city's climate as tropical rainforest (Af). Its 1991-2020 normals list a July average high of 90.0F, a July average low of 76.1F and about 61.75 inches of rain a year, with the typical window for 90-degree days running from mid-April to mid-October. WeatherSpark rates the air muggy or worse at least 43% of the time from mid-April to the start of December. In most houses here the air conditioner runs nearly every day, and the ducts and air handler sit in an attic far hotter than the outdoor air. We seal and insulate those attics, walls, garages and metal buildings with open-cell or closed-cell spray foam where it fits, and with blown-in insulation where it does the same job for less.

What the code and the experts ask for

Palm Beach County is in Climate Zone 2A on the county list kept by OpenEI. The 8th edition (2023) Florida Building Code, Energy Conservation, as summarized by the Insulation Institute, sets R-38 ceilings for Zone 2, R-13 for wood-frame walls and R-6 (or R-4 continuous) for mass walls like concrete block. For existing homes, ENERGY STAR recommends R-49 in an uninsulated Zone 2 attic and R-38 where three to four inches are already in place. Plenty of older Palm Beach County attics fall short of both.

Where Palm Beach houses take on heat

The attic is the biggest source. Sun on a tile or shingle roof heats the decking, the attic air gets hotter still, and that heat soaks down through thin insulation into the rooms below. Gaps around light fixtures, plumbing, the air handler platform and the attic access let hot, humid attic air leak in, and leaky duct connections pull it straight into the return. Concrete block walls absorb sun all afternoon and give it back in the evening. Garages next to or under living space add more. Sealing the leaks and adding enough insulation cuts the heat and the moisture the AC has to remove.

Closed cell vs open cell

Open-cell foam is light and soft, about R-3.5 to R-3.7 per inch per HomeGuide. It expands to fill rafter bays, stops air movement and costs less per inch, which is why it is the common choice for roof decks in sealed attics here. It lets some vapor pass, so a roof deck can dry inward if it gets a little damp. Closed-cell foam is dense and rigid, about R-5 to R-7 per inch per HomeGuide, and it slows vapor and resists water. We use it on metal buildings, in shallow spaces, on garage ceilings under living space and where water exposure is a concern. Your quote names the foam for each area and why.

Sealed attic or sealed ceiling

With the air handler and ducts in the attic, a sealed attic with open-cell foam on the roof deck puts that equipment in air near house temperature instead of in an oven. That can make a real difference to comfort and AC run time. If your air handler is in a closet and the ducts are short or tight, sealing the ceiling and blowing cellulose or fiberglass to depth usually costs much less and works well. We price both when both make sense.

Spray foam insulation cost

HomeGuide's 2026 guide lists installed spray foam at $1.50 to $5.00 per square foot: open-cell $1.50 to $3.50 and closed-cell $3.00 to $5.00. It puts a spray foam attic at $3,000 to $8,000 and a whole house at $8,000 to $20,000, and notes many installers set a minimum of $1,000 to $2,000 or more. Fixr's 2025 guide shows $3.15 to $7.50 per square foot for existing walls and $2.75 to $6.50 for new construction. Blown-in runs $1.00 to $2.80 per square foot in HomeGuide's guide. Those are national planning numbers; the price on your written estimate is what you pay.

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FPL ceiling insulation rebate

FPL lists an instant $220 rebate on ceiling insulation when the home's current insulation is below R-8 and the work is done by an FPL-approved participating contractor, applied as a credit on the contractor's invoice. Ask any contractor whether they are on FPL's list before you sign, and check the program terms with FPL, since they can change.

Choosing among insulation contractors and spray foam companies

The Palm Beaches have no shortage of spray foam insulation contractors and insulation companies. To compare quotes, ask each one which foam goes on which surface and how many inches; what R-value that reaches; how they will handle the soffit and ridge vents in a sealed attic; what ignition or thermal barrier the foam needs where exposed; and how long you need to stay out while it cures. HomeGuide advises at least 24 hours. A quote with only a total and no thickness or R-value is hard to judge.

We cover West Palm Beach and its neighbors: Palm Beach across the lagoon; Riviera Beach, North Palm Beach, Palm Beach Gardens, Jupiter and Tequesta to the north; Lake Worth Beach, Lantana, Boynton Beach and Delray Beach to the south; Palm Springs and Greenacres to the southwest; and Royal Palm Beach, Wellington and Loxahatchee Groves to the west. The coastal cities hold older homes and many condos, the middle suburbs are full of 1970s and 1980s block homes, and the western villages have newer houses, horse barns and rural lots. Each town page covers what is different there.