Thatched roofs can develop surface mold, algae, or moss, particularly in shaded, damp, or humid climates where moisture lingers on the exterior fibers. The organic nature of materials like water reed and straw means they naturally weather over time, often acquiring a dark grey or greenish patina due to microscopic biological growth. However, a healthy thatched roof is designed to shed water and dry out quickly in the wind and sun, which prevents destructive internal rotting and deep fungal mold. Regular maintenance, trimming nearby overhanging tree branches, and ensuring proper airflow across the roof surface help keep surface mold and moisture accumulation to a minimum.
1 votes
Marked as accepted