Eliminates Field-Fabrication Errors

Inside and outside corner rubber tie-in wings, along with L, T and Z transitions, are factory-assembled, removing the risk of field-fabrication errors and ensuring consistent, reliable waterproofing continuity.

Industry-Leading Return-to-Service

Willseal® MSS delivers faster return-to-service cycles than traditional epoxy or mortar-based competitive products, reducing project downtime.

Complete Waterproofing Continuity

Integral rubber tie-in wings maintain the integrity of the split-slab waterproofing membrane, providing leak-free protection of the structural slab throughout the system's service life.

Traffic-Rated and Fuel Resistant

The factory-applied sealant facer on the Willseal 250 foam is traffic-rated and fuel-resistant, ensuring reliable performance in demanding vehicular and pedestrian applications.

Arrives Kitted and Labeled

All required components, including the foam expansion joint, expansion joint accessories and concrete anchors, arrive at the job site kitted and labeled for smooth, efficient installation.

Versatile Joint Size Range

Willseal® MSS accommodates a wide range of split-slab construction conditions and project requirements.

Proven Foam Core Technology

Built around Willseal 250, a fully monolithic ±50% movement precompressed acrylic-impregnated hydrophobic foam joint, the system delivers long-term watertight performance under high-movement conditions.

Made in the USA

Willseal® MSS is proudly manufactured and assembled in the USA using domestic and imported components, supporting quality assurance and reliable supply chain performance.