The Seattle Aquarium Expansion is a transformative addition to the city’s iconic waterfront, connecting the vibrant Pike Place Market to the new Ocean Pavilion and the scenic waterfront.

Two local Washinton-based contractors, Snyder Roofing of Snohomish and Wayne’s Roofing of Sumner, were hired to waterproof the project’s elevated and winding walkways that extend over and around Seattle Aquarium’s newly constructed expansion.

Challenges on the 25,000-square-foot project included precision installation techniques for installing the waterproof membrane on the structure's sloped surfaces, installing complex expansion joints for a continuous waterproof barrier, and the need for constant coordination and communication with other trades for seamless integration.

Hydrorotech® Monolithic Membrane 6125® (MM 6125®) was chosen because it is a tough, flexible, self-healing, hot fluid-applied asphalt membrane for waterproofing and roofing applications. The membrane conforms and bonds to all surface irregularities and has been successfully used worldwide on all types of horizontal and vertical structures for more than 60 years! Beyond the waterproofing, the planters and green space were completed with Hydrotech drain mats and LiteTop growing media to further enhance the beauty of the aquarium. 

This single-source warranty was critical for the long-term waterproofing performance of this project on the beautiful, yet often rainy, Seattle waterfront.