Deck Painting & staining right here in Hudson, Massachusetts.

A deck coating has to cope with standing snow, foot traffic, direct sun on the boards and water sitting in every seam. The coating that works depends less on the town than on your particular lot, the species of wood, and what is already on the boards.

Detached single-family homes make up 53.8% of local housing units, with another 7.1% in attached, townhouse-style buildings. Attached units can share a railing line or deck structure with the neighbor next door, so color and timing may need to be agreed with that owner, or with an association if there is one.

Lots near the water and under the trees

The Assabet River runs through most of the town, and Lake Boon sits on the line with Stow. A deck on a lot facing open water may see full sun and wind for much of the day, which fades pigment and dries out the top of the boards. A deck tucked under trees on the north side of a house stays damp longer after rain and collects leaves and pollen, conditions where mildew grows and film-forming coatings tend to peel.

Neither situation is a reason to skip a coating. They are reasons to pick the right one, and to check the boards for soft spots near the house, at stair stringers and around posts, where water collects first. Rotted boards should be replaced before anything is applied, because no stain will hold on wood that is breaking down.

Stain, solid stain or paint

Whatever is already on the deck limits the choice. You cannot put a penetrating stain over an old solid stain or paint without stripping first. Our paint vs. stain comparison goes deeper on which coating fits which deck, and deck stain in a New England winter explains how the freeze-thaw cycle affects each.

• Penetrating semi-transparent stain: shows the grain, wears gradually rather than peeling, easy to recoat; needs more frequent renewal
• Solid-color stain: more UV protection and hides mismatched boards, but behaves more like a film and can peel on horizontal surfaces
• Porch and floor paint: suited to tongue-and-groove porch floors and railings that were painted before; least forgiving on walking surfaces of a deck that gets standing water

Prep that decides how long it lasts

A deck coating fails from the bottom up when it goes on over gray, weathered fibers, dirt or mildew. A proper job means cleaning with a deck cleaner, a brightener on pressure-treated or cedar boards, sanding raised grain and loose fibers, and letting the wood dry fully before staining. New pressure-treated lumber generally needs to dry out before it will absorb stain; a sprinkle test, where water beads up or soaks in, shows when it is ready.

On older porches attached to houses built before 1978, the floor and railings may have been painted with lead-based paint decades ago. The EPA rule applies to paid exterior work disturbing more than 20 square feet of that paint, so scraping an old porch floor calls for lead-safe methods; see our lead-safe painting page.

When to schedule

Stain needs dry wood, no rain in the forecast for the cure period, and temperatures within the label range, so spring through early fall is the realistic window here. Avoid staining in direct midday sun on a hot day, which dries the product before it soaks in. If you are also repainting the house, the exterior painting page covers coordinating both.