
WEATHERCAP Joint Protective System (Lead Stone Flashing / Tee Caps)
- Soft lead flexes with building movement, no leaks
- Oxidizes to neutral grey, blends with masonry
- Protects sealant, extending joint service life
GSA Historic Preservation Specified
U.S. Patent 6991400 Protected
scanner Tee Caps, also known as the WEATHERCAP® Joint Protective System or lead stone flashing, are patented soft lead strips designed to protect horizontal and vertical masonry joints from moisture penetration. Engineered to flex with building movement, they extend sealant life, resist corrosion and mold, and blend seamlessly into stone and masonry facades.


A tee cap, also called the WEATHERCAP® Joint Protective System, is a soft lead strip interposed within masonry joints alongside caulk or sealant. It absorbs stress from building movement, reduces joint opening size, and prevents moisture penetration, extending the life of the sealant and protecting the structure from leaks and deterioration.
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Protects original masonry joints during restoration while meeting GSA historic preservation technical standards.

Used on parapets, copings, and cornices of federal buildings and monuments to prevent moisture damage.

Installed in new masonry joints to prevent sealant failure caused by building settlement and movement.

Protects masonry joints on university buildings and campus landmarks from long-term moisture penetration.
Talk to our experts for custom solutions and tailored guidance.
Our U.S. patented soft lead system permanently flexes with building movement, sealing masonry joints without cracking or tearing.
Installed at the Washington Monument, U.S. Supreme Court, and Smithsonian, our tee caps perform under the highest preservation standards.
Orders ship in 6-foot lengths within 48 hours, backed by a continuously operating manufacturing and supply chain.
Share your project details and our team will respond with technical specifications, pricing, and lead times within one business day.
For immediate assistance, feel free to give us a direct call at (985) 649-4000.
For immediate assistance, feel free to give us a direct call at (985) 649-4000.