General Rubber Expansion Joints Overview and Specifications

The primary benefit is extending sealant life by protecting it from UV rays and weather. The soft lead is flexible, allowing it to creep and adapt to building movement without tearing. This prevents margin checking and moisture leaks. The material also resists corrosion and mold, oxidizing to a neutral grey that blends with masonry.

Type A is a flat cap designed for joints between masonry units on the same plane, such as the top joints of copings or cross joints on a cornice. Type B is a 90-degree cove cap used for right-angle joints, like where a horizontal surface (e.g., a window sill) meets a vertical wall. The correct type depends on the joint's geometry.

Yes, absolutely. While it is widely used in historic restoration, the system is also specified for new construction to ensure durable, long-term joint protection from the outset. The A-2 Type A Flat Joint Cap, for instance, is designated specifically for new construction installations. Proper joint design ensures superior performance.

The soft lead construction makes the caps flexible and easy to work with. They are installed as an adjunct to standard caulk or sealant application. As it is a lead product, installers must follow safety protocols outlined by OSHA (29 CFR 1910.1025), including using gloves and proper hand washing, to ensure safe handling on the job site.

Yes, WEATHERCAP® joint caps can be painted to match the surrounding masonry or architectural details. If left unpainted, the soft lead naturally oxidizes to a neutral grey color that blends in well with most stone and masonry, providing a discreet and aesthetically pleasing finish. This makes it versatile for both visible and concealed joints.

All WEATHERCAP® products are supplied in standard 6-foot lengths, which can be cut to size on-site. We maintain a full manufacturing and supply chain, and materials are typically shipped within 48 hours of order placement, ensuring your project stays on schedule. Custom and large-size caps are also available upon request to meet specific project needs.