Adding a parapet wall makes a flat roof far safer than leaving the roof s edge exposed.
Parapet roof drainage design.
Limit the number of parapet walls.
Watch for clogs blockage at the roof drain or scupper.
This would be in situations where a retaining wall or parapet prevents direct access to the roof s edge.
Install a drain at most 50 ft.
Provide adequate flashing for parapets openings walls joints skylights etc.
Roofs of this design will have one or more roof drains or scuppers installed.
With a parapet wall it is possible for a roof to retain or pond water should the primary roof drainage system fail.
Keep the distance between drains to at most 200 ft.
This kind of drainage system is most common on small flat roofs where water volume and buildup isn t extreme.
1503 4 non hvhz size per asce 7 and 1617.
Manually adjust roof planes to have a negative pitch to create a parapet wall structure with a center drain.
P1106 5 design and install per fbc plumbing.
It s also sometimes used in tandem with scuppers.
Install a drain at most 50 ft.
Appendix b in the ipc provides rates of rainfall for various u s.
At page top and at left our photos show a low slope roof surrounded by a parapet.
Hvhz so the code does allow scuppers as primary elements.
From the edge of a valley.
Working with manufacturers will help develop your understanding but don t delegate your design responsibility to them.
However these days parapets add a lot more to a flat roof than just a cosmetic detail.
Looking at a building from the ground a parapet may seem to simply be a design choice that adds little more than a characteristic look to a building.
Cities based on inches per hour that may fall during a storm of one hour duration and a 100 year return period.
Architectural home design software all content support videos chieftalk forum.
Parapet and valley gutters are treated differently because they have a higher risk of failure.
If a building has roof access that residents use regularly for whatever reason adding a parapet greatly decreases the chance that someone could fall over the.
They can be used in conjunction with gutters and downspouts to divert the flow to the desired location.
Select number of roof drains and calculate the roof area sloped to each drain.
Parapet wall roof drainage scupper location shall comply with the florida fire prevention code.
On larger and more complex schemes specialist consultants may be employed to design the rainwater drainage system.
Size horizontal storm drainage piping.
Scuppers are used to provide an outlet through parapet walls or gravel stops on flat and built up roofs to allow drainage of excess water.
Size vertical storm drainage piping.
