How Often to Stain a Deck in Florida (and When to Stop Staining)

Why decks in hot, humid climates need stain more often

Sunlight breaks down the surface of exterior wood, and repeated wetting and drying makes the boards swell and shrink. The USDA Forest Products Laboratory lists what follows on a deck without proper maintenance: checks and cracks, raised grain and mildew, which in turn raise the risk of decay and insect attack. In Florida, every one of those drivers runs at full strength for most of the year.

The National Weather Service office in Miami defines the South Florida wet season as May 15 to October 15, the months that bring 60 to 70 percent of the average yearly rainfall. Through that season, surface dew points sit in the 70s almost daily and showers and thunderstorms develop nearly every day. West Palm Beach averages 36.30 inches of rain in the wet season alone, based on 1991 to 2020 normals. A deck that is soaked most afternoons and baked most mornings spends little time fully dry, so a finish whose job is to keep water out is working constantly.

Mildew is the third pressure. Pigment in a stain shields the wood and the mildewcide in the finish from sunlight, according to the Forest Products Laboratory, so mildew gains ground as the pigment wears thin. Sherwin-Williams notes that it grows in areas that are dark and moist with limited air movement, which on a deck means the strip along the house wall, the boards under planters and the space beneath outdoor furniture.

A realistic staining schedule for Palm Beach County

Sherwin-Williams gives every two to three years as the commonly accepted guideline for deck staining, and names the factors that move it: the type of wood, the type of stain, how heavily the deck is used and the climate. Manufacturer ratings for individual products run longer, but they are stated as maximums, and the conditions behind them are not published. For a deck in full sun in Palm Beach County, plan around the low end of each range and let a yearly inspection set the exact date. The steps, the path to the pool and the boards in afternoon sun lose their finish well before the shaded corners, so the most exposed boards set the schedule.

Signs your deck is due

The quickest check is the water drop test Sherwin-Williams recommends before staining: sprinkle water on the boards, and if the wood absorbs the droplets, it is ready for stain. Run it across the sunniest boards first, and plan any recoat for a day with no rain in the forecast, at least 24 to 48 hours after the last rain.

Stain, paint or coating: which deck finish lasts longer

Homeowners comparing deck stain, deck paint and deck coatings in West Palm Beach are choosing between two families of finish, and they behave differently in a humid climate.

Penetrating stains soak into the wood rather than forming a layer on top. The USDA Forest Products Laboratory recommends them for deck surfaces, along with water-repellent preservatives, because they perform better overall and are easier to reapply. A semi-transparent stain does not blister or peel even when excess moisture gets into the wood; it wears away gradually.

Paint and solid color stain form a film. Sherwin-Williams points out that paint traps moisture, which can lead to wood damage, while stain lets it escape. The Forest Products Laboratory adds that film-forming finishes on decks are prone to fail by peeling and wear excessively in high-traffic areas, although they can perform well on railings.

Deck coatings, the thicker resurfacing products applied over worn boards, are film-forming as well, and the same concern applies: water that gets underneath has a harder time leaving. Before choosing one, ask the applicator how the product handles moisture already in the wood and what recoating involves once it wears. For most wood decks in Palm Beach County, a penetrating semi-transparent stain on a regular schedule is the finish the evidence supports. It also commits the owner to recoating every few years for as long as the deck stands.

What the stain cycle really costs over time

The price of a single recoat is only part of the cost. Each cycle includes cleaning the deck, letting it dry, moving furniture and planters, the product, the labor to apply it and the days the deck is out of use. The Forest Products Laboratory advises at least two warm, windy days of drying after cleaning before a finish goes on, and Sherwin-Williams advises waiting 24 to 48 hours after rain. During the wet season, finding that dry window can add days of its own.

Frequency multiplies all of it. At the two to three year guideline, a deck kept for 20 years goes through seven to ten finish applications, counting the first. Deferring a cycle saves the recoat but leaves the boards exposed, and the Forest Products Laboratory notes that most decks are retired because of cracks and checks that timely finishing could mostly have avoided.

For a hotel, restaurant or rental property, each cycle also means closing the space. For architects and contractors specifying a deck, the useful comparison is the total over the expected life of the project, recurring cycles included, rather than the installed price per square foot alone.

Getting off the stain cycle: composite and hardwood on an aluminum frame

The stain cycle exists because wood needs a finish to hold its color and shed water. The way off it is a surface that does not depend on a finish, such as Exterpark’s composite decking, installed on an aluminum frame with the patented Shark Clip hidden fastening system.

Decks in West Palm Beach, Jupiter and Palm Beach Gardens

Across Palm Beach County, deck maintenance in Florida follows the conditions above, with differences from one property to the next. A pool deck in full sun, a terrace under a tree canopy and a waterfront deck with no shade at all each wear at their own pace, which is why the most exposed boards should be inspected first instead of assuming one date for the whole surface.

If you are planning a new deck or replacing a worn one, our pages on West Palm Beach composite decking, Jupiter and Palm Beach Gardens cover the options in each city. Exterpark USA works from a warehouse in Hialeah, Florida, through its authorized distributor, Cedro Rojo.