The roof drainage outlets and rainwater downpipes are calculated based on the design principles for gravity drainage systems established in ss525 2006 code of practice for drainage of roofs.
Rain water roof pipe.
Water resistant 46 waterproof 51 flashing type.
The calculations below are meant for drainage from flat roofs where water are expected to spread over the entire flat roof during rain.
Metal roof flashing metal roofing trim paintable roof flashing rain diverter roof flashing 20x20 aluminum extrusion 4 inch pipe.
Rain water that runs down a plumbing vent pipe at the roof goes into the house drain system at a point past the traps at the plumbing fixtures that keep sewer gas out of the home and heads harmlessly out to the sewer or septic tank.
A rainwater downpipe is a pipe that is used to direct rainwater away from a building typically from roof guttering to a drainage system.
It is sometimes also referred to as a downspout drain spout roof drain pipe or leader.
Inside diameter black new construction or reroof thermoplastic vent pipe roof flashing model pb 312 4bk 19 97.
Counter flashing 28 metal.
Once the roof levels are designed and approved the selection of the rainwater outlets can be reviewed.