This is why we use Owens Corning Shingles- youtube.com/watch?v=cC53VdEI…

Sheathing decay-Poor ventilation and moisture in your layers of roofing materials is the decay of sheathing/called decking the layer of plywood that forms the foundation of roof. Sagging ceiling, broken gutters, leaks or missing patches of shingles, sheathing may be damaged.

Ceiling and wall stains Leaks from outside the house or moisture trapped inside it can cause stains and possibly mold or mildew.

Blistering or peeling paint Poor ventilation may cause moisture to get trapped in your house, which may cause exterior paint to peel and blister.

Attic leaks Check your attic after severe weather. A leak could mean some shingles are damaged, the underlayment — a protective barrier between your shingles and the plywood of your roof — has failed, or flashing — the material that seals joints on your roof — has deteriorated.

Vanguard Roofing, LLC Professional Appearance, Courteous. Customer Satisfaction Guaranteed 434-484-2372