Fence Builders Brush Prairie WA | Call Fencing services

The main cause is moisture absorption combined with temperature swings—common in our Pacific Northwest climate. Boards swell and shrink, leading to warping. We prevent this by using pressure-treated or naturally rot-resistant woods, leaving proper expansion gaps during installation, and applying a high-quality weatherproofing sealant. Regular staining also helps lock out moisture.

Look for dark green or black spots, a slimy texture, or a musty smell, especially in shaded or damp areas. Mold not only looks bad but can weaken wood over time. Our solution is to clean the fence with a mold-killing wash, then seal it with a stain or paint that contains mildewcide. We also recommend improving airflow around the fence by trimming back vegetation.

Start with proper installation: use ground-contact rated lumber, set posts in gravel for drainage, and leave gaps between boards. Then apply a penetrating wood sealer or a high-quality exterior stain every 2–3 years. For extra protection, choose a stain with UV blockers and mold inhibitors. Our weatherproofing service includes both cleaning and coating to give your fence a fighting chance against Brush Prairie’s wet winters.