A thatched roof keeps rain out through a combination of steep pitch and the unique physical properties of tightly packed natural reeds or straw. The roof is installed at a steep angle, usually no less than 45 degrees, which allows rainwater to run rapidly down the outer surface rather than soaking deeply into the material. The individual stems are layered tightly together with an overlapping structure that creates countless tiny, continuous channels directing water downward toward the eaves. Because the outer layer swells slightly when wet, it seals itself against further moisture penetration, while the underlying layers remain completely dry and protect the interior of the building.
1 votes
Marked as accepted