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Home In Seattle’s rainy climate, water management isn’t just a good idea, it’s essential. If you’re noticing musty smells, water stains, or even standing water in your basement or crawl space, the root cause might not be deep underground. Surprisingly, one of the most overlooked contributors to basement moisture is inadequate or missing downspout extensions. At All Seasons Waterproofing and Drainage, we’ve helped countless Seattle homeowners avoid costly waterproofing issues by improving one simple thing: where your roof runoff ends up. Why Roof Drainage Matters