Roof Drains Per Square Foot

50 000 4 400 11 36.

Roof drains per square foot.

Use the following formula to determine g p m. We also stock many of the top selling drains and parts onsite so most orders ship same day. Measuring the square feet of the roof along with knowledge of local rainstorms is invaluable when. Divided by the 4 600 sq.

Divide total roof area by area found in step 3 to obtain the number of drains required example. Gallons per minute r rainfall intensity inches hour a roof area square feet 0104 conversion factor g p m sq. The next step is to consult table 1106 3 figure 2 to learn the required size of pipe. And then determine from the chart below how many roof drains you require.

Equals 32 6 or 33 drains required. For example a 3 inch per hour rainfall will build up to a 3 inch depth on a flat roof in one hour at the rate of 1 87 gallons per hour sq. 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. For 1 one inch hr.

0 gallons 0 cubic feet. Using a 10 000 sq. 0104 x r x a g p m. Each 4 drain size in a 6 hourly rainfall area will accommodate drainage of 3 070 sq.

0 cubic feet per second cfs peak runoff volume. 0 submit your design let nds evaluate and help you with preparation of your submittal drawings and specs. The result is the number of drains needed. Take the roof s total square footage and divide by the total square footage handled by one drain.

They come in a variety of shapes tubes chains etc but their goal is to prevent gutters from overflowing and give water somewhere to go. Sizing data for conventional drainage. If you need help finding a drain ask our drain wizard or call to speak with our roof drain expert. This reveals that the minimum size for the leader pipe is 5.

Round spee d catch basins. Drainage pipe required minimum diameter. The drains should be equally spaced and located symmetrically about the roof. Or 0312 gallons per minute sq.

The downspout is the portion of the gutter that drains water away to a safe place on the ground. The speed at which the rain collects at the drain. Or 12 drains required. Each drain can handle 4 600 sq.

The number of roof drains shown should be verified with local code requirements. Therefore the 100 000 sq. 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. Hy tech is an authorized distributor of all roof drain manufacturers so you can find what you need when you need it.