Moss and algae growth on slate and shingle roofs
Why it happens here
The Ohio River keeps humidity high in Bellevue year-round, and the north-facing slopes never dry out. Moss roots lift slate tiles and shingle edges, letting water underneath the surface where you cannot see the damage until it reaches the attic.
Our approach
We hand-clean slate and treat shingle roofs with a moss treatment that kills the root, not just the surface. During maintenance visits we check the underlayment on the affected slopes and replace any section that has gone soft.