Window Sill Corner Flashings and Tape

Yes, absolutely. Window sills are highly exposed to weather and are critical points for water intrusion. Proper flashing, like our lead caps, protects the sealant in the joint between the sill and the surrounding masonry. This extends the life of the sealant, prevents costly water damage, and maintains the building's structural integrity over time.

Our system is installed as an adjunct to sealant. First, the joint is prepared and filled with a compatible sealant. Then, the appropriate WEATHERCAP® profile is pressed into the uncured sealant. This method covers the sealant, reduces the effective joint opening, and creates a durable, weather-resistant barrier that flexes with the building.

Soft lead has a low elastic modulus, allowing it to remain flexible and 'creep' into new configurations as a building settles or moves. Unlike more rigid materials, it won't tear or shear under stress. It also oxidizes to a neutral grey that blends with masonry and is highly resistant to corrosion and mold, ensuring long-term performance.

Yes, our system is suitable for both historic restoration and new construction projects. Using WEATHERCAP® in new builds provides superior joint protection from the start, significantly extending the life of sealants and reducing long-term maintenance needs. Our A-2 Type A cap is specifically designated for new-construction installations.

Type A is a flat cap designed for joints between masonry units on the same plane, such as the top joints of a window lintel or a stone coping. Type B is a 90-degree cove cap used for right-angle joints, like where a projecting window sill or cornice meets a vertical wall. Both provide the same durable, flexible sealant protection.

It acts as a physical shield, covering the sealant to protect it from UV degradation, extreme weather, and physical damage. By being embedded in the joint, it also reduces the effective size of the joint opening, which minimizes the stress and strain the sealant experiences during building movement, thus preventing premature failure and checking.