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53 20. What defects has your agency observed in the performance of waterproofing membranes on existing concrete bridge decks? Percentage Response a. Lack of adhesion between the waterproofing membrane and the concrete deck b. Lack of adhesion between the waterproofing membrane and the asphalt surface c. Punctured waterproofing membranes d. Membrane blistering e. Horizontal shear failure at the membrane f. Cracks in the waterproofing membrane g. Voids under the waterproofing membrane h. Reinforcement corrosion i. Moisture penetration through the membrane but cause unknown j. Other If Other, please describe briefly. Other defects included spalling and deterioration of the concrete deck below the membrane and insufficient thickness of materials. 10. REPAIRS 21. If your agency has requirements or specifications for repair of membrane systems, please provide details. Respondent Response Alaska When a waterproofing membrane is damaged, our procedure is to replace the entire waterproofing membrane. New Hampshire See Specification, Section 538. New York Each manufacturer has provided guidance to repairs needed during installation of their product and how to ensure it is prop- erly performed. See Materials Details for approved systems. Tennessee We don't repair membranes. We would replace them. Utah Utah DOT follows the repair recommendations provided by the manufacturers of each system used. Table continued on p.54