Unaflex Expansion Joint Catalog and Product Overview

The system uses a soft lead strip installed within a sealant-filled joint. The flexible lead moves and 'creeps' with the building's settlement or thermal expansion. This covers the sealant, protecting it from UV and weather exposure, which helps prevent the joint from failing or leaking over time and extends the life of the sealant.

Type A caps have a flat profile and are used for joints between masonry units on the same plane, such as cross joints on copings, cornices, or lintels. Type B caps feature a 90-degree cove profile, making them ideal for right-angle joints where a horizontal surface meets a vertical one, like a window sill joining a wall or a tread meeting a riser.

Yes, absolutely. While renowned for its role in historic preservation, the WEATHERCAP® system is frequently specified for new construction to ensure long-term joint durability from the start. Our A-2 Type A cap, for instance, is specifically designated for new-construction installations, providing proactive protection against future movement and moisture issues.

All WEATHERCAP® products, including stock sizes and custom orders, are supplied in standard 6-foot lengths. This allows for easy handling and transportation on the job site, where they can be field cut to the precise size needed for each specific masonry joint application. Most orders for stock items are shipped within 48 hours.

The caps are designed to be aesthetically neutral. The soft lead surface rapidly oxidizes to a dead neutral grey that blends seamlessly with most stone and masonry. For projects requiring a specific color match, the caps are fully paintable, allowing them to integrate perfectly with the building's facade without compromising the joint's protection.

Installation is a straightforward process for qualified masonry contractors. The lead cap's anchor is simply set into a joint filled with a compatible, high-grade sealant. We provide comprehensive manufacturer support, including CAD drawings, technical specifications, and detailed installation guidance to ensure a proper, long-lasting, and weather-resistant application.