The Ultimate PNW Deck Maintenance Checklist
Protecting Your Investment

In the Pacific Northwest climate, you should stain your deck every 2-3 years depending on sun exposure and foot traffic. The best indicator is the 'water bead test'—if water soaks into the wood instead of beading up, it's time to re-stain. Oil-based stains typically last longer in our wet climate than water-based options, though they take longer to dry. The ideal window for staining in Olympia and Shelton is July through early September when you can guarantee 48 hours of dry weather.

For moss removal on PNW decks, use soft washing techniques with oxygen bleach solutions rather than pressure washing, which can damage wood fibers. Mix oxygen bleach (not chlorine bleach, which weakens wood) with water, apply it to the affected areas, let it sit for 10-15 minutes, then scrub with a stiff brush and rinse. For persistent moss, we recommend a professional soft wash treatment that cleans without the damaging high pressure that erodes the wood surface.

The screwdriver test is the most reliable method: press a flathead screwdriver into suspect areas—if it sinks in more than 1/4 inch, you have rot. Other warning signs include dark discoloration (especially black streaks), a spongy feeling when you walk on boards, and mushroom growth near joists or posts. In the damp South Sound climate, check areas with poor drainage first, especially around stairs and near the house where water tends to pool.

Yes, in many cases rotted joists can be repaired through a process called 'sistering'—attaching a new pressure-treated joist alongside the damaged one. This structural wood repair is cost-effective when rot is localized to one or two joists. However, if rot has spread to the ledger board, posts, or more than 30% of the joists, replacement is often the safer and more economical long-term solution. We provide free deck safety inspections to assess the extent of damage and recommend the most cost-effective approach.

Composite decking is low maintenance, not no maintenance—an important distinction in our wet climate. While composite doesn't rot or need staining, it still requires regular cleaning to prevent mold and mildew buildup, which thrives in the humid Pacific Northwest. Plan to wash your composite deck 2-3 times per year with a deck cleaner specifically formulated for composite materials. Areas with limited sun exposure are especially prone to algae growth and need more frequent attention.

A deck is beyond restoration when structural integrity is compromised—specifically when posts are rotted at ground level, the ledger board is failing, or more than 40% of joists show rot. Safety is paramount: if boards flex excessively, railings wobble, or you can see daylight through cracks in structural members, replacement is necessary. The cost of extensive structural wood repair often exceeds 70% of a new deck's cost, making replacement the smarter investment. Our team can assess your deck's condition and provide honest recommendations for repair versus replacement.

Western Red Cedar is the gold standard for PNW decks—it's naturally rot-resistant, locally sourced, and ages beautifully. Pressure-treated hemlock is a budget-friendly alternative with good longevity when properly maintained. For premium decks, exotic hardwoods like Ipe offer exceptional durability (30+ years) but come at a higher cost. We typically recommend Western Red Cedar for most Shelton and Olympia homeowners because it performs well in our climate, supports local forestry, and provides the best balance of cost, aesthetics, and longevity.

Yes, we offer annual deck inspection and maintenance plans starting at $499, which includes a spring cleaning and sealing service, fall drainage clearance, and a comprehensive safety inspection. Our maintenance contracts provide peace of mind and extend your deck's life by catching small issues before they become expensive repairs. Contract members also receive priority scheduling for any needed repairs and a 10% discount on restoration services. Contact us to learn more about our seasonal deck care packages.