Flashing refers to thin strips of metal, typically aluminum or galvanized steel, installed at roof joints and transitions to prevent water from seeping into vulnerable areas. Common locations include around chimneys, skylights, and valleys. Damaged or improperly installed flashing is one of the leading causes of roof leaks.
Roof decking, also called sheathing, is the wooden board layer that sits beneath your roofing materials and forms the structural base of your roof system. During an inspection, contractors check for soft spots, rot, or warping in the decking that may indicate moisture damage or structural compromise. Compromised decking often requires replacement before new roofing materials can be installed.
Underlayment is a protective layer installed directly over the roof decking and beneath the outer roofing material, such as shingles. It acts as a secondary barrier against water infiltration if the outer layer is breached. Inspectors assess its condition to determine whether it provides adequate protection against moisture and weather events.
Granule loss refers to the wearing away of the small mineral particles embedded on the surface of asphalt shingles. These granules protect shingles from UV exposure and add fire resistance, so significant loss accelerates shingle deterioration. During a roof inspection, excessive granule loss in gutters or bare patches on shingles signals that a roof may be nearing the end of its lifespan.
