Construction Specialties Expansion Joint Covers Guide

There are two primary configurations. Type A is a flat cap designed for same-plane masonry joints, such as those found on copings or belt courses. Type B is a 90-degree cove cap intended for right-angle joints, like where a projecting lintel meets a wall, at window sills, or around door frames.

Absolutely. The system is ideal for historic preservation and is specified in the U.S. General Services Administration's Historic Preservation Technical Procedures. Its ability to protect vulnerable masonry joints has made it a trusted solution for numerous national landmarks, state capitols, and historic university buildings across the country.

The soft lead material has a low elastic modulus and is designed to slowly 'creep' into new joint configurations as a building settles or moves. This flexibility prevents the cap from shearing or failing under stress, allowing it to maintain a continuous, protective seal over the caulk joint for the long term.

Yes, the lead caps can be painted to match surrounding masonry or other architectural details. If left unpainted, the lead surface will naturally oxidize to a dead neutral gray color, which blends in seamlessly with most stone, brick, and concrete surfaces, making it visually unobtrusive in restoration work.

WEATHERCAP® is used to protect sealant in a wide range of masonry applications, including joints on copings, parapets, cornices, belt courses, water tables, and balustrades. It is also highly effective for weatherproofing joints around window sills, door frames, and projecting stone lintels in both new construction and restoration.

All WEATHERCAP® joint covers are supplied in standard 6-foot lengths, allowing for easy handling and cutting to size on the job site. We maintain a full manufacturing and supply chain, and materials are typically shipped from our facility within 48 hours of an order being placed to locations across the United States.