Deck Painting & staining serving Sudbury and Metro West MA.

The town's 2022 preservation plan describes a landscape that was open farmland with far fewer trees from the 1700s into the mid-1900s, and woodland that has returned since the suburbs filled in. For a deck, that tree cover cuts both ways. Shade keeps summer sun from baking the finish, but it also slows drying after rain, holds leaves and pollen against the boards and gives mildew a place to start. A deck under tall trees and a deck on an open south-facing lawn on the same street can need different products and different recoat schedules.

Single-family detached houses make up 83.8% of housing units. Another 8.1% are single-family attached homes; if yours is one of them, check whether a condominium or homeowners association sets rules on deck color or shared railings before choosing a stain.

Identify the boards before choosing a finish

In December 2003 manufacturers voluntarily stopped making CCA-treated wood for homeowner uses. EPA does not require tearing out older CCA decks, and it suggests that regularly applying a penetrating coating such as stain may reduce leaching. On an older deck, then, a maintained stain coat may do more than improve its looks.

• Pressure-treated pine installed in the last year or so: let it dry until water soaks in instead of beading
• Pressure-treated lumber older than 2004: possibly CCA-treated; cut it with goggles and a dust mask, wash hands after handling, never burn offcuts
• Cedar: takes oil-based and semi-transparent stains that keep the grain visible
• Composite or PVC: cleaned, not stained, unless the board maker approves a coating
• Boards already carrying solid stain or paint: can only take another film-forming coat unless stripped to bare wood

Penetrating stain or a film?

On a shaded deck, a penetrating semi-transparent stain has an advantage: when it wears, it fades rather than peels, and the next coat goes on after cleaning without scraping. Solid stains and porch paints hide mismatched or repaired boards better and block more UV, but once moisture gets underneath, the film lifts and must be scraped before recoating. The deck paint and stain comparison and the article on how deck stain survives a New England winter go further into the trade-off.

Porch floors on older houses

Over half of local housing, 53.7%, predates 1980, and a front porch on a house that age may have painted floors and steps rather than stain. In housing built before 1978, paid exterior work that disturbs more than 20 square feet of paint falls under EPA lead-safe rules, and scraping a porch floor and its stairs can reach that. The lead-safe painting page explains the containment involved.

If the house is in one of the local historic districts, the commission reviews exterior features visible from a public way, with visibility judged even in winter when leaves are down. A front porch facing Old Sudbury Road is plainly in view; a back deck may not be. Repainting in white or a pre-approved color is exempt, and for anything else, ask the Historic Districts Commission whether your porch or deck color needs a Certificate of Appropriateness.

Cleaning, repair and timing

Shaded decks benefit most from a thorough cleaning: a deck cleaner to lift mildew and gray fibers, a full rinse, a brightener to neutralize the cleaner, light sanding where fibers are raised, and then enough dry days for the wood to dry out. Loose nails get reset or replaced with screws, and soft treads, rail caps and post bases are replaced before stain goes on.

Stain needs dry wood and dry weather to cure, which puts the work between late spring and early fall. If the house is being repainted the same season, finishing the deck after the exterior painting keeps drips and ladder marks off fresh stain.