MM Systems Expansion Joint Solutions for Architectural Needs

The primary benefit is durability. The soft lead construction is flexible and has a low elastic modulus, allowing it to move with the building and prevent the sealant from tearing or checking. This extends the life of the joint sealant by protecting it from environmental exposure. It also resists corrosion and mold, oxidizes to a neutral grey that blends with masonry, and can be painted to match aesthetic requirements.

The main difference is the shape, which corresponds to the joint's geometry. Type A is a flat-cap configuration designed for joints where masonry units are approximately in the same plane, such as the top of a coping or a balustrade. Type B is a 90-degree cove-cap configuration used for right-angle joints, such as where a window sill meets a vertical wall or a projecting cornice joins a parapet.

Yes, WEATHERCAP® is suitable for both new construction and restoration projects. While it is widely specified for historic preservation, its ability to protect masonry joints from movement and environmental stress is highly beneficial for new buildings. In fact, the A-2 Type A flat cap is designated specifically for new-construction installation only. Other profiles are selected based on the architectural joint details.

All WEATHERCAP® products are supplied in standard 6-foot lengths, which can be cut and fitted on-site to meet project requirements. Materials are typically shipped within 48 hours of an order being placed, ensuring quick turnaround for construction and restoration schedules. Note that all sales are final, and returns of material are not accepted, so careful planning and measurement are important.

Absolutely. WEATHERCAP® is a premier solution for historic masonry preservation and is a key application for the product line. It is specified in the U.S. General Services Administration (GSA) Historic Preservation Technical Procedures. The system has a proven track record on dozens of national landmarks, including the Washington Monument and U.S. Supreme Court, making it a trusted choice for protecting architecturally significant structures.

Yes, WEATHERCAP® products can be painted to match the surrounding masonry or architectural color scheme. If left unpainted, the soft lead surface naturally oxidizes to a dead neutral grey color that blends in seamlessly with most stone and masonry, providing a discreet and aesthetically pleasing finish. This versatility makes it suitable for a wide range of architectural styles and preservation standards.