Roof Drain Pipe Design

Or 12 drains required.

Roof drain pipe design.

Note that roof drain bodies and vertical conductors are sized utilizing a different table that a horizontally sloped storm line. Enter table 1108 2 until you find a diameter pipe that will. Section 101 5 of the ipc tells us not to reduce the pipe size in the direction of flow. A minimum 5 inch diameter drain on a 1 4 inch per foot slope is required.

Rd rd 10 000 4 x 3 75 9 375 sq ft. 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. A 5 inch diameter pipe with a 1 4 inch per foot slope will carry 4 720 sq ft. We also stock many of the top selling drains and parts onsite so most orders ship same day.

This reveals that the minimum size for the leader pipe is 5. To convert to an area for use in table 1108 2 do this. The flexible design easily bends and holds its shape and can be extended from 25 in. The flow rate used for sizing the storm drainage piping shall be based on the maximum anticipated ponding on the roof.

1 8 1 4 and 1 2 per foot. Watts drainage products rd 300 r series 4 in. 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. Section 1105 roof drains 1105 2 roof drain flow rate.

Different horizontal sloping will offer different drainage capacities. But this isn t the whole story. The result is the number of drains needed. Use this downspout extension to divert water away from the foundation or connect to drainage pipe and catch basin to control drainage.

Cast iron roof drain with 2 in. Pipe sizing is listed as amount of square foot roof areas served by the drains. Take the roof s total square footage and divide by the total square footage handled by one drain. Code tables outline pipe slopes of.

Horizontal drain 10 000 sq ft. 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. If you need help finding a drain ask our drain wizard or call to speak with our roof drain expert. Hy tech is an authorized distributor of all roof drain manufacturers so you can find what you need when you need it.

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.