Several ordinary decisions void roof warranties, and homeowners usually find out **at the moment they file a claim.**
The most common causes:
– **Inadequate attic ventilation.** This is the top offender in Houston. Manufacturers specify minimum ventilation, and a roof that cooks from underneath falls outside coverage. It’s also frequently the builder’s original shortcut, not yours.
– **Pressure washing.** Stripping granules is treated as owner-caused damage.
– **Installing anything that penetrates the roof** — satellite dishes, solar mounts, new vents — without proper flashing or manufacturer-approved methods.
– **Overlay installations.** Roofing over existing shingles reduces or voids many material warranties.
– **Unapproved repairs.** A patch by an uncertified contractor can end coverage on the whole roof.
– **Mixing manufacturers.** Using one brand’s shingles with another’s underlayment or ridge cap breaks system warranties that require matched components.
– **Failure to register.** Enhanced warranties usually require registration within a set window after installation.
– **Ponding water** on any low-slope section.
Before you add solar panels or a new vent, check what your warranty requires — a short conversation beforehand is much cheaper than discovering the exclusion later.