TPO Counter Flashing: Essential for Commercial Roofing

TPO flashing refers to components made from Thermoplastic Polyolefin used to seal perimeters, penetrations, and transitions on a TPO roofing system. It is heat-welded to the main TPO membrane to create a monolithic, waterproof barrier against the elements.

WEATHERCAP® is made from a soft lead composition. This material is chosen for its flexibility and ability to deform with building movement without failing. This ensures a permanent, elastic seal that protects the underlying sealant and prevents moisture intrusion in masonry joints.

It is primarily used for weatherproofing masonry joints in new construction and historic restoration. Common applications include protecting joints on copings, parapets, cornices, belt courses, window sills, and around door frames on landmark buildings across the United States.

Yes, WEATHERCAP® can be painted to match surrounding masonry or architectural details. If left unpainted, its surface naturally oxidizes to a neutral grey color that blends in well with most stone and masonry, which is ideal for historic preservation work.

It acts as a protective shield, covering the sealant to reduce its exposure to UV radiation, weather, and physical stress. This significantly extends the life of the sealant and prevents premature failure, such as margin checking, ensuring the joint remains waterproof for longer.

Type A is a flat cap for joints between masonry units on the same plane, like on copings or lintels. Type B is a 90-degree cove cap used for right-angle joints, such as where a horizontal stone sill meets a vertical wall or at corner and fillet joints.