Kwang San Expansion Joint: Types and Applications

We offer two primary configurations. Type A is a flat cap for joints on the same plane, like copings and lintels. Type B is a 90° cove cap for right-angle joints, such as where walls meet cornices or around window frames. Both are available in stock sizes and can be part of custom application-specific systems.

Absolutely. WEATHERCAP® is ideal for historic preservation and is specified in the U.S. General Services Administration's (GSA) Historic Preservation Technical Procedures. Its soft lead construction is gentle on historic masonry and has been successfully used on landmarks like the Washington Monument and the Smithsonian Institution.

Yes, WEATHERCAP® can be painted to match the surrounding masonry or architectural details. If left unpainted, its soft lead surface naturally oxidizes to a neutral grey color that blends seamlessly with most stone and masonry, providing a discreet and effective seal.

The system is made from soft lead, which has a low elastic modulus. This allows it to remain flexible and slowly 'creep' into new joint configurations as the building settles or moves. Unlike rigid materials that can crack or shear, WEATHERCAP® maintains a continuous, weather-resistant seal, protecting the underlying sealant.

The WEATHERCAP® system is made from a soft lead composition. This material is chosen for its flexibility, durability, and weather resistance. It effectively protects underlying sealants from UV degradation and moisture. As a lead product, standard safety precautions like wearing gloves should be followed during handling, per OSHA regulations.

All WEATHERCAP® products, including both Type A and Type B configurations, are supplied in standard 6-foot lengths. This allows for easy transportation and handling on the job site, where they can be cut and fitted as needed for specific joint requirements. We typically ship materials within 48 hours of order placement.