The ASTM D5957-98 (reapproved in 2021) is the Standard Guide for Flood Testing Horizontal Waterproofing Installations. This guide establishes a methodology for verifying the watertightness of horizontal waterproofing systems—such as those on plaza decks and parking garages—before they are covered by final layers like pavers or soil. Core Technical Summary
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E. Maintain water depth for minimum 24 hours, replenishing as needed.
As the water began to pool over the plaza deck, Elias explained the stakes. They weren't just splashing around; they were creating a temporary pond to verify the watertightness of the new membrane before the heavy pavers were installed. According to the ASTM D5957-98 standard, the water had to sit for a minimum of 24 hours. "We wait," Elias said, "and we watch the ceiling below." The ASTM D5957-98 (reapproved in 2021) is the
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F. Inspect underside of deck for leakage at 2-hour intervals during first 8 hours, then at 24 hours. They weren't just splashing around; they were creating
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3.5 FLOOD TESTING