Deck Pressure Washing in Vancouver: Before, During, and After (With Real Photos)
The deck hadn't been cleaned in four years. The wood underneath was in better shape than anyone expected - because we caught it in time.
The deck hadn't been cleaned in four years. The homeowner knew it - she'd been watching the gray deepen and the surface checking spread across the cedar boards every summer. She kept putting it off because she wasn't sure if cleaning would help or if the deck was already too far gone.
The wood underneath was in better shape than anyone expected. Because we caught it in time.
The Process
Deck pressure washing isn't just pointing a wand at the boards. The process matters - especially with cedar, which is softer than pressure-treated lumber and more susceptible to surface damage from improper technique.
We start with a pre-treatment: a deck cleaner solution applied with a low-pressure sprayer and allowed to dwell for 15-20 minutes. This breaks down the gray oxidation layer and lifts embedded dirt before the pressure wash begins. Then the pressure wash itself - always working with the grain, at a distance that cleans without raising the grain or damaging the wood fibers. For cedar, we use a fan tip at 1,200-1,500 PSI. Pressure-treated lumber can handle more; cedar cannot. [1]
After washing, the deck needs to dry completely before any sealer or stain is applied - typically 48-72 hours in spring weather. Applying sealer to wet wood traps moisture and causes the finish to peel within one season.
What the Cleaning Revealed
Two boards near the stairs had surface checking that had progressed further than the rest of the deck - worth monitoring, but not structural. One post base showed early moisture staining on the concrete below it, suggesting the post base hardware may need replacement within the next year. The rest of the deck was in excellent condition. The homeowner had been worried for nothing - and now she has a baseline to compare against next spring.
We applied a penetrating oil-based sealer after the drying period. The deck went from weathered gray to warm cedar brown in about four hours of work.
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