A minimum 5 inch diameter drain on a 1 4 inch per foot slope is required.
Roof drain pipe design.
Different horizontal sloping will offer different drainage capacities.
Take the roof s total square footage and divide by the total square footage handled by one drain.
The result is the number of drains needed.
Watts drainage products rd 300 r series 4 in.
This reveals that the minimum size for the leader pipe is 5.
The published roof drain flow rate based on the head of water above the roof drain shall be used to size the storm drain drainage system in accordance with section 1106.
According to the chart for 1 8 slope per 12 of pipe for 5 000 square feet of roof area with a 6 per hour of rainfall the required pipe size is 8.
Rd rd 10 000 4 x 3 75 9 375 sq ft.
Section 101 5 of the ipc tells us not to reduce the pipe size in the direction of flow.
Pipe sizing is listed as amount of square foot roof areas served by the drains.
Enter table 1108 2 until you find a diameter pipe that will.
Section 1105 roof drains 1105 2 roof drain flow rate.
A 5 inch diameter pipe with a 1 4 inch per foot slope will carry 4 720 sq ft.
Hy tech is an authorized distributor of all roof drain manufacturers so you can find what you need when you need it.
To convert to an area for use in table 1108 2 do this.
Note that roof drain bodies and vertical conductors are sized utilizing a different table that a horizontally sloped storm line.
Code tables outline pipe slopes of.
But this isn t the whole story.
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.
Cast iron roof drain with 2 in.
50 000 4 400 11 36.
If you need help finding a drain ask our drain wizard or call to speak with our roof drain expert.
Buried or underground roof drainage downspout defects clogging overflowing holes corrosion leaks that cause wet basements or crawl areas proper installation of buried downspout extensions proper installation of french drains seepage pits at flat sites gutter downspout defects cause wet basements crawl areas questions answers about installing maintaining repairing buried roof.
Or 12 drains required.
The flexible design easily bends and holds its shape and can be extended from 25 in.
We also stock many of the top selling drains and parts onsite so most orders ship same day.
To size the vertical roof drain for the same parameters 5 000 square feet of room area and 6 per hour of rain consult table 1106 2 figure 3.
1 8 1 4 and 1 2 per foot.
Horizontal drain 10 000 sq ft.
