Last revised in 2018, ASPE 45 is the only design standard that establishes the minimum performance specifications for siphonic roof drainage systems to help manufacturers, engineers, and inspectors properly design and test engineered siphonic roof drainage systems.
All too many times a bid is turned in only to be told, “We need to look at VE options.” There are plenty of mechanical units that can be downgraded, architectural features that can be sacrificed, or peel back every division to see what can possibly be optimized for that extra dollar.