Double Sphere Expansion Joint Types and Benefits Explained

WEATHERCAP is a soft lead cap installed over a sealant-filled joint. It shields the sealant from UV exposure, weather, and physical stress. This protection extends the sealant's life, prevents it from drying or cracking, and reduces margin checking, ensuring a long-lasting weatherproof seal.

Yes, it is ideal for both. In historic restoration, it preserves the integrity of aging masonry, and it's specified in GSA Historic Preservation Technical Procedures. For new construction, it provides a durable, long-term solution to prevent joint failure from building settlement and movement.

WEATHERCAP is primarily available in two configurations. Type A is a flat cap for joints on the same plane, like coping or balustrade tops. Type B is a 90-degree cove cap designed for right-angle joints, such as where a cornice meets a wall or at the base of a window sill.

Yes, WEATHERCAP can be painted to match the surrounding masonry or architectural design. Its surface also naturally oxidizes to a neutral grey color that blends seamlessly with most stone and masonry, providing an unobtrusive and aesthetically pleasing finish without any coating.

The soft lead construction has a low elastic modulus, allowing it to remain flexible and 'creep' into new configurations as the building moves or settles. Unlike rigid materials, it absorbs stress without tearing or shearing, maintaining a permanent, elastic seal against moisture penetration.

All WEATHERCAP products, including stock sizes and custom orders, are supplied in standard 6-foot lengths. This allows for easy handling and field cutting to fit specific joint dimensions on-site. Most orders for our stock items are shipped from our facility within 48 hours.