Roof Drains Per Square Foot

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Roof drains per square foot.

Each 4 drain size in a 6 hourly rainfall area will accommodate drainage of 3 070 sq. 50 000 4 400 11 36. Equals 32 6 or 33 drains required. The number of roof drains shown should be verified with local code requirements.

Divide total roof area by area found in step 3 to obtain the number of drains required example. We also stock many of the top selling drains and parts onsite so most orders ship same day. The next step is to consult table 1106 3 figure 2 to learn the required size of pipe. This reveals that the minimum size for the leader pipe is 5.

The roof drain calculator below is based on the maximum amount of rainfall in inches per hour of the hypothetical worst storm in the past 100 years and which has a two percent chance of occurring in any given year. Measuring the square feet of the roof along with knowledge of local rainstorms is invaluable when. 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. Round spee d catch basins.

Using a 10 000 sq. 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. Therefore the 100 000 sq. Sizing data for conventional drainage.

The speed at which the rain collects at the drain. Each drain can handle 4 600 sq. If you need help finding a drain ask our drain wizard or call to speak with our roof drain expert. Area roof will require 100 000 3070 32 5 or 33 roof drains for ideal drainage.

0 gallons 0 cubic feet. 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. Divided by the 4 600 sq. Drainage pipe required minimum diameter.

The downspout is the portion of the gutter that drains water away to a safe place on the ground. Use the following formula to determine g p m. 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. The drains should be equally spaced and located symmetrically about the roof.

0104 x r x a g p m. Roof area the 3 inch rainfall will produce 18 700 gallons in one hour at the rate of 312 gallons per minute. 0 submit your design let nds evaluate and help you with preparation of your submittal drawings and specs. Gallons per minute r rainfall intensity inches hour a roof area square feet 0104 conversion factor g p m sq.

And then determine from the chart below how many roof drains you require. The result is the number of drains needed. For 1 one inch hr. Or 12 drains required.