Apron flashing is a type of flashing that is used to seal the joint between a roof and a vertical surface, such as a wall or chimney. It is typically made of metal, such as aluminum, copper, or galvanized steel, and is installed along the lower edge of a roof where it meets a vertical surface.
The purpose of apron flashing is to prevent water from entering the joint between the roof and the vertical surface. It is installed by folding the flashing over the lower edge of the roof and up against the vertical surface. The top edge of the flashing is then covered by the next course of roofing material, such as shingles or tiles.
Apron flashing is an important component of a roofing system and is especially important in areas with heavy rainfall or where there is a risk of water damage to the building. It helps to protect the building from water infiltration and can prevent costly water damage and repairs.