Flashings

In masonry and roofing, a flashing is a piece or strip (often made ofzinc, lead, aluminum, PVC, or mortar) designed to ensurea watertight sealbetween two elements of different materials. 

• Usage:It is typically used to seal the joint between a roof section and a wall, or around achimney stack
• Types:These may include a metal strip with a sealant joint, PVC, or analuminum profile