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Water penetration through concrete and masonry structures causes more construction failures and maintenance expenditure than almost any other single mechanism in the built environment. Basement walls that leak, bathroom waterproofing that fails within three years, flat roof waterproofing that cracks under thermal cycling, and tunnel linings that allow groundwater ingress all represent failures of the waterproofing mortar system at a material or application level. VAE Redispersible Polymer Powder is the additive that determines whether a cementitious waterproofing mortar system performs over its design service life or fails prematurely under the combination of hydrostatic pressure, thermal movement, and substrate cracking that waterproofing systems must resist in service.