Untied Expansion Joints: Types, Uses, and Installation Tips

WEATHERCAP is a patented soft lead strip, available in flat (Type A) or 90-degree (Type B) profiles. It's installed within a sealant-filled masonry joint to protect the sealant from environmental damage and accommodate building movement. This extends the life of the joint seal and prevents moisture penetration.

They are designed for horizontal and vertical masonry joints in applications like copings, cornices, belt courses, window and door perimeters, and balustrades. They are ideal for both historic restoration projects and new construction where long-term joint durability is critical for building integrity.

Yes, our lead joint caps can be painted to match the surrounding masonry or architectural elements. If left unpainted, the soft lead surface quickly oxidizes to a neutral grey color that naturally blends in with most stone and masonry, making it visually unobtrusive for historic and modern buildings.

The soft lead construction has a low elastic modulus, allowing it to remain flexible and creep into new positions as the building settles or moves. Unlike rigid solutions, it doesn't shear or tear, providing a continuous, permanent seal that adapts to changing joint configurations over time without failing.

Absolutely. WEATHERCAP is specified in the U.S. General Services Administration (GSA) Historic Preservation Technical Procedures. It has been used on dozens of national landmarks, making it a trusted and proven solution for protecting the integrity and longevity of historic masonry structures across the country.

We offer a range of stock sizes for Type A (flat) and Type B (cove) caps to fit joints from under 3/8 inch up to 1 1/2 inches. All caps are supplied in standard 6-foot lengths for easy handling on site. Custom sizes and configurations can also be manufactured upon request for unique project requirements.