ASTM D5957 provides a guided methodology for testing the water-resistance of waterproofing installations on horizontal surfaces with a slope no greater than .
: Used for horizontal surfaces with a slope of 2% or less, such as plaza decks and parking garages. astm d595798 pdf free
This inconsistency led to disputes — an installer claimed “we followed standard practice,” while the owner insisted flood testing was inadequate. ASTM Committee D08 formalized consensus from contractors, manufacturers, testing labs, and owners, resulting in D5957-98. For over 25 years, it has served as the go-to reference. ASTM D5957 provides a guided methodology for testing