Construction Performance Guidelines
STANDING WATER ON A FLAT ROOF
Flat roofs shall be installed to drain water. Standing water on roofs designed for water retention is acceptable.
One-Year - Work and Materials
Roofs not meeting the acceptable condition shall be repaired.
Flat roofs typically are slow to drain and should be constructed to handle exposure to standing water over short terms. Municipalities can require flow control devices to be installed on roof drains. Some standing water is normal and should generally dissipate after a few days.