Waterproofing repairs on concrete roof slabs need to be done regularly to extend the life of the structure and save on costs, said Edgar Vargas, a senior engineer at GENIVAR, a global engineering company. Concrete roof slabs on old parking garages often lack waterproof membranes, exposing the structure to damage from chloride and deicing salt, according to this article. "Do the waterproofing repairs and masonry that is required and it will last as long as the building," Vargas said.

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