Shingle warranty exclusion

Definition

The clause that voids a roof warranty if the roof is cleaned with pressure.

Why It Matters

Roof cleaning is the highest-priced work this trade sells to homeowners, and asphalt shingle manufacturers exclude damage caused by pressure washing from their warranties, which is why the trade moved to low-pressure chemical washing for roofs. A crew that pressure washes a roof can void a warranty worth more than the job, and the homeowner finds out years later when a claim is denied. Ask which method the book's roof work uses, whether the quotes say so in writing, and whether anybody has ever had a claim come back.