Blocked — Gutter Downpipe

Asphalt shingles shed granules over time due to weathering and UV degradation. These granules are heavy and settle at the bottom of gutters and inside downpipe elbows. Over time, they create a concrete-like sediment that hardens within the pipe, severely restricting flow diameter.

Keep an eye out for these signs:

The immediate consequence of a blocked downpipe is the spectacle of water overflowing the gutter’s edge. This overflow is not merely dramatic; it is destructive. Instead of being directed safely to the ground and into storm drains, water is discharged directly against the building’s façade. This constant wetting accelerates the decay of mortar, rots wooden fascia boards and soffits, and stains brickwork and siding. More insidiously, water finds its way behind cladding and into wall cavities, where it fosters the growth of toxic black mold—a health hazard that can permeate interior living spaces. In colder climates, the standing water in a blocked pipe freezes and expands, literally splitting the metal or PVC pipe from within, leading to a complete system failure that requires replacement, not just cleaning. blocked gutter downpipe