Green City Construction | Best Fence Builders in Kirkland, WA

Kirkland's frequent rain and shade from surrounding trees create ideal conditions for moss and algae to thrive on fence surfaces. Moisture seeps into untreated wood, leading to dark stains and green patches. Poor drainage or fences placed too close to vegetation can accelerate this process.

Surface discoloration often appears as gray or black streaks from rain runoff, while moss forms soft, green patches that hold moisture. If the wood feels damp, has a musty odor, or shows signs of rot (soft spots, crumbling), moss may be causing deeper damage. A quick scrape test: if green material lifts off easily, it's moss; if it's embedded in the grain, it's likely algae or dirt.

Green City Construction uses a combination of gentle pressure washing with eco-friendly detergents to kill moss and remove stains, followed by a protective sealant or stain. For ongoing prevention, we recommend annual cleaning and applying a moss-resistant coating. Trimming back overhanging trees and improving airflow around your fence also reduces moisture buildup.