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When wet leaves sit on your concrete, they release tannins that penetrate the porous surface within hours.

After the first heavy fall storm, you’ll want to inspect your roof from the ground using binoculars, checking for missing, curled, or cracked shingles, lifted flashing, and sagging sections.

Fallen leaves and moisture accelerate algae and biofilm growth, creating an invisible layer that strips traction from concrete, pavers, and wood.

Portland’s wet fall climate turns your gutters into a trap. Rain saturates fallen leaves, compressing them into dense, waterlogged mats that block drainage fast.

October gives you the last stretch of dry, mild weather before the Pacific Northwest rainy season shuts everything down. Once November hits, consistent rainfall saturates surfaces.

Before Halloween guests arrive, you’ll want to tackle several key areas around your Portland home. Pressure wash your front entry, driveway, and fence to remove grime, moss, and slippery algae buildup.

Forest Grove’s dense urban canopy of oaks, maples, and Douglas firs deposits far more organic debris onto your roof, gutters, and siding than you’d see in less-wooded areas.

Before Aloha’s rainy season hits, you’ll want to act fast. Start with a professional pressure wash to remove moss, algae, and built-up grime that accelerate surface damage.

Cedar Mill’s mixed canopy drops debris in overlapping waves throughout October, so your gutters never get a break between accumulation cycles.

Aging siding absorbs rainfall quickly, allowing moss, algae, and mold to take hold while cracked paint and failed caulk let water penetrate deep into sheathing and framing.