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WHO WE ARE The Waterproofing Contractors Association WCA is a trade association dedicated to advancingthe science of preventing leaks. The membership reads as a whos who in waterproofing expertise. Member companies of the WCA come together to exchange stateoftheart information on waterproofing see the latest developments in waterproofing technology and products and establish and renew personal relationships with colleagues in the field. Ournetwork and leadership is comprisedof manufacturers distributors contractors architects engineers working together.