Deck Painting & staining across Brockton, Massachusetts.

Outdoor living space here takes several forms. Detached single-family houses make up 47.4% of the housing, and on those the deck is one owner's decision. The older multi-family stock, described in the city's Housing Strategy Plan as wooden buildings on small individual lots, has less yard to work with, so the wood that needs coating may be a porch floor or a run of exterior stairs rather than a freestanding deck. Each calls for a different coating approach.

Whatever the structure, horizontal wood fails first. Snow sits on it, water pools in the board gaps, and the sun hits the top surface all summer, so a deck finish wears out well before the paint on the wall next to it.

Choosing between stain and paint

Once a film-forming coating is on the boards, switching back to a penetrating stain means stripping to bare wood. Our paint versus stain comparison explains the trade-offs over several seasons.

• Penetrating semi-transparent stain: shows the wood, wears gradually, and recoats without scraping
• Solid-color stain: hides mismatched replacement boards; behaves more like paint as it ages
• Porch and floor enamel: the traditional choice for tongue-and-groove porch floors; needs scraping when it fails
• Composite boards: cleaned rather than coated, unless the manufacturer approves a product

Porch floors and stairs on older buildings

With 81.4% of local housing built before 1980, an old porch floor or set of back stairs may have lead-based paint under its top layers. Outdoors, EPA lead-safe work practices apply once more than 20 square feet is disturbed, which a full porch floor easily exceeds. That changes how the old coating is removed: wet scraping, ground covers and daily cleanup rather than dry sanding into the yard. The lead-safe painting page covers the method.

On a two- or three-family building, rear stairs may serve as a second way out for upstairs tenants, so the schedule matters. One flight or one landing can be done at a time, with the coating given enough dry time before it is walked on again.

Shade, moisture and the wooded edges

Decks that sit under trees stay damp longer, grow mildew and algae, and collect leaf stains in fall. D.W. Field Park, about 650 acres spanning northern Brockton and southern Avon, is ringed by a band of woodland between its parkway and its boundary, and a yard that backs onto tree cover like that gets the same shade and leaf fall. Those boards benefit from a mildewcide-treated product, careful cleaning, and a gap between board edges kept free of debris.

Full-sun decks have the opposite problem: UV breaks down the stain on the top surfaces while the railings stay in good shape. On those, recoating the floor more often than the rails is a sensible way to manage cost.

The prep sequence

Each new coat should follow the same steps: wash with a wood cleaner, rinse, brighten the wood to neutralize the cleaner, sand fuzzy or raised fibers, and let the boards dry thoroughly. Loose nails are reset or swapped for screws, and soft boards at stair treads and post bases are replaced first. Stain needs a stretch of dry weather to cure, so the workable window runs roughly from late spring into early fall. See how deck stain holds up through a New England winter for product notes.

If the house is also due for paint, doing the siding and trim first protects the freshly stained deck from drips; the exterior painting page covers that part.