Yes, a properly installed thatched roof is remarkably waterproof, relying on a combination of steep pitch—usually at least 45 degrees—and the unique physical structure of tightly packed natural reeds. When rainwater falls onto the roof, the steep angle causes the water to run rapidly down the outer surface along individual stems rather than soaking straight through. The overlapping layer of reeds forms a continuous shedding channel, and the outer fibers swell slightly when wet to create a natural seal against further moisture penetration. As long as the roof is maintained with adequate thickness and pitch, the interior remains completely dry.
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