Jointmaster Expansion Joint Systems for Building Movement

Type A is a flat cap for joints between masonry on the same plane, like top joints on copings and lintels. Type B is a 90° cove cap used for right-angle joints, such as where a window sill meets a vertical wall. The choice depends entirely on the geometry of the masonry joint being protected. Both types are designed to provide a continuous, flexible seal against the elements.

WEATHERCAP joint caps are made from a soft lead composition. This material is chosen for its flexibility and ability to 'creep,' or slowly deform to adapt to building movement without failing. It naturally oxidizes to a neutral grey that blends well with masonry and resists corrosion and mold growth on the covered sealant, ensuring long-term performance and aesthetic compatibility.

Yes, WEATHERCAP systems are highly effective for new construction. By incorporating the system into new masonry joint details, architects and builders can proactively prevent common points of failure from the outset. This extends sealant life, reduces long-term maintenance costs, and protects the building's envelope integrity. The A-2 Type A cap is specifically designated for new construction installation.

WEATHERCAP protects sealant in two ways. First, it physically covers the sealant, shielding it from UV radiation, rain, and other environmental stressors that cause degradation. Second, it absorbs stress from building movement. Its soft lead construction accommodates shifts, reducing strain on the sealant and preventing the 'margin checking' or tearing that leads to leaks and premature failure.

Yes. While we offer a wide range of stock sizes to fit common joint dimensions, custom solutions are available. For oversized masonry joints, non-standard restoration details, or unique architect-specified conditions, we can provide special-order larger sizes and custom designs. Contact our technical team to discuss your specific project requirements and we can develop a solution to match.

All WEATHERCAP products, including both stock sizes and custom orders, are supplied in standard 6-foot lengths. This uniform length is convenient for transport and handling on the job site. It allows for efficient field cutting and fitting to the specific, varied dimensions of the masonry joints being protected across a project, minimizing waste and simplifying installation.