Which Cabinet Materials Hold Up in Florida Humidity?
In Florida, the cabinets that last are built from dimensionally stable materials (solid plywood boxes and moisture-resistant MDF for painted parts, not particleboard), use solid wood only where it's engineered to move, are sealed on every surface with a durable finish, and carry quality hardware. Just as important is the house itself: cabinetry installed in a home with steady air conditioning and controlled humidity will outlast the same cabinetry in a home that sits closed up and damp.
We've built custom cabinetry and millwork in Tampa since 2013. Here's how we think about each part of a cabinet in this climate.
Why Florida is hard on cabinetry
Wood and wood products take on and give off moisture until they match the air around them. When humidity rises, wood swells. When it drops, wood shrinks. In most of the country that cycle follows the seasons. In Florida it comes from several directions at once: high outdoor humidity for much of the year, air conditioning drying the air indoors, homes that sit unoccupied through the summer, and waterfront houses exposed to salt air.
The failures you see in Florida homes almost always trace back to that movement:
Painted doors cracking at the joints where rails meet stiles
Solid wood panels splitting or showing unfinished lines at the edges
Swollen cabinet bottoms under sinks and dishwashers
Doors that stick in August and gap in January
Rusted hinges and pulls near the coast
How wood actually moves
Wood doesn't move evenly. It swells and shrinks across its width, and hardly at all along its length. A wide, flat-sawn board can change by roughly an eighth of an inch or more across a foot of width between a damp summer and a dry winter, while its length stays essentially the same. That's why a solid wood tabletop can crack if it's screwed down tight, and why a solid wood door panel needs room to float.
Good cabinetmaking isn't about stopping that movement. It's about choosing the right material for each part and building so the movement doesn't matter:
Solid wood belongs in frames, face frames, edge banding, door rails and stiles, and furniture parts, where the pieces are narrow and the joinery can accommodate movement.
Veneered plywood is the right call for wide stain-grade panels: slab doors, end panels, wall paneling. You get the look of solid walnut or white oak on a core that barely moves.
MDF is the most stable substrate of all, which makes it ideal for painted panels and painted doors.
We buy only kiln-dried lumber. Kiln drying brings the wood's moisture content down before it ever reaches our shop, and the heat also kills any insects living in the wood, which matters in a state with drywood termites.
Cabinet boxes: plywood vs. MDF vs. particleboard
Particleboard is the material most budget and many big-box cabinets use for boxes. It's inexpensive and flat, but once water gets past its surface it swells permanently and loses its screw-holding strength. Under a sink in a humid climate, that's a real risk.
Plywood is our standard. Every BUILT cabinet box is built from 3/4-inch plywood. Its cross-laminated layers resist swelling, it holds fasteners well, and it tolerates the occasional leak far better than particleboard.
MDF (medium-density fiberboard) has its place. It's extremely stable in flat panels, which makes it an excellent substrate for painted panels and some painted door parts. It needs to be fully sealed, because raw MDF edges soak up moisture quickly.
Doors and panels: where solid wood belongs
Solid wood is beautiful and it's what people expect in high-end cabinetry. It's also the material that moves the most. The key is construction:
Frame-and-panel doors let the center panel float in its frame, so it can expand and contract without splitting the door.
Wide flat panels (slab doors, wall paneling, large end panels) are usually better built from veneer over a stable core than from solid lumber glued up edge to edge.
Painted doors show movement most, as hairline cracks at the joints. For painted work we use MR50, a high-density, moisture-resistant MDF. It stays flat, holds crisp profiles, and resists swelling far better than standard MDF.
Finishes: seal every face
A finish slows the rate at which wood takes on moisture. In Florida, the quality of the finish, and whether it covers every surface (backs, edges, the insides of holes), matters more than almost anywhere else.
Catalyzed finishes (such as conversion varnish or catalyzed lacquer) cure harder and resist moisture far better than off-the-shelf paint or non-catalyzed lacquer.
UV protection matters in a state this sunny. We use a UV-protectant finish so wood tones and painted colors don't fade or yellow near big windows.
Shop finishing in a controlled spray room produces a more consistent, better-cured finish than brushing or spraying on site.
Sealing hidden surfaces, not just the faces people see, keeps a door from taking on moisture unevenly and cupping.
Hardware: what matters and what doesn't
Inside a conditioned home, even on the water, you don't need an exotic "coastal" cabinet spec. Good hardware and a good finish do the work. We use Blum soft-close hinges and drawer slides as our standard, with stainless or galvanized hardware where it's called for.
Beach projects are the exception. On St. Pete Beach, Longboat Key or Anna Maria, where doors are open to the salt air, we switch to stainless steel hardware so nothing rusts or pits. Fully exterior projects, like outdoor kitchens, get their own specification.
The house matters as much as the cabinets
Even perfectly built cabinetry will move if the house swings wildly in humidity. The simplest protections:
Keep the air conditioning running, including when the home is empty over the summer. Many cabinet makers recommend holding indoor relative humidity roughly between 35% and 55%.
If you close up a seasonal home, use a dehumidifier or a smart thermostat with humidity control rather than switching the AC off.
Deal with leaks under sinks right away.
On new construction, don't install fine millwork until the house is dried in and the HVAC is running. We'll often wait on delivery rather than install into a damp building.
What this means when you're comparing quotes
If two cabinet quotes are far apart, ask each shop:
What are the boxes made of?
How are the doors built, and what are painted doors made of?
What finish system do you use, and is it applied in the shop?
Are all surfaces sealed, including backs and edges?
What hardware do you specify?
Is your lumber kiln-dried?
In Florida, the answers to those questions will predict how the cabinetry looks in ten years better than the price will. For the rest of the list, see 12 Questions to Ask a Custom Cabinetmaker Before You Hire.
Frequently asked questions
Do solid wood cabinets warp in Florida?
They can if they're built without allowing for wood movement. Wood moves mostly across its width, so frame-and-panel construction, veneered cores for wide panels, a complete sealing finish and a climate-controlled home keep movement from causing problems.
Is MDF bad for cabinets in humid climates?
Not when it's used well. Moisture-resistant MDF is very stable and is the best substrate for painted doors and panels. It must be fully sealed, and it isn't the best choice for areas that get wet, like the bottom of a sink cabinet.
What is the best finish for cabinets in Florida?
A catalyzed finish, such as conversion varnish or catalyzed lacquer, applied in a controlled shop environment and sealed on all surfaces, holds up far better than brushed paint or non-catalyzed lacquer. In sunny rooms, choose one with UV protection so colors don't fade.
How can I protect my cabinets if my home sits empty over the summer?
Keep the air conditioning on and control humidity. A thermostat or system with dehumidification is the easiest way to prevent swelling, sticking and finish failure while you're away.
BUILT is a custom architectural millwork and cabinetry firm in Tampa, Florida. Since 2013 we've engineered, built, finished and installed cabinetry for custom residences throughout Tampa Bay and Sarasota. Talk with us about your project →
Written by Andrew Watson, founder of BUILT.
