If you’ve come across the search term “ASTM D5957-98 PDF” , you’re likely involved in construction, building inspection, waterproofing, or forensic engineering. This standard, though formally withdrawn, remains a frequently referenced document for understanding how to properly test horizontal surfaces—such as plaza decks, roof terraces, and below-grade waterproofing membranes—for water tightness using flood testing. What is ASTM D5957-98? Published in 1998 by ASTM International, ASTM D5957-98 provided a standardized guide for conducting flood tests on horizontal waterproofing installations. The goal was simple: simulate actual water ponding conditions to verify that a waterproofing system would perform as intended before being covered by wear surfaces, pavers, or soil.