Roof Gutter Drain Pipe Size

I have enough slope but not sure what size drain pipe to use.

Roof gutter drain pipe size.

Following this logic it is possible that for roof drains 6 in. I will be collecting water from 2 or 3 downspouts and sending it around the house to the street. I plan to use 3 corrugated pipe but would 4 inch be better. 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.

Roof drain connected to an 8 in. Many factors can effect the proper size of gutter. If a roof s various drainage areas call for different size gutters go for the biggest one k style. Smacna s new downspout and gutter sizing calculator enables the user to manually enter the design area of the roof or use the design area wizard for the calculation.

My roof is about 1500 sq ft and this will be draining about half of the roof. 6 inch 7 960 square feet. 6 inch 3 840 square feet. 5 inch 5 520 square feet.

For the vast majority of rains gutter and downspouts sizes considerably less than recommended will do the job. For example in the u k. Most of all is location and your average rainfall during a large downpour. Roof drain connected to a 6 in.

For example a 4 in. How do i figure how much each pipe can handle. The flexible design easily bends and holds its shape and can be extended from 25 in. Or less in diameter the piping will be larger in diameter than the roof drain.

For larger roof drains the pipe may be smaller such as a 10 in. This wizard makes it easy to calculate the roof design area by providing various shape calculations and the calculation for vertical walls area per international plumbing code ipc. 5 inch 5 520 square feet. Primary cause for water spillage is debri in the gutter.

The 6 in 12 pitch factor 1 1 multiplied by 1 000 yields an effective area of 1 100 square feet. 6 inch 7 960 square feet. Designers specify compliance with bs en 12056 3 2000 that includes a calculation for the allowable capacity of the rainwater pipes. The roof drain or gutter or drain piping or downspout leader size diameter other size constraints e g.

A house in chicago has a roof whose actual drainage area is 1 000 square feet. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. Use this downspout extension to divert water away from the foundation or connect to drainage pipe and catch basin to control drainage. 5 inch 2 500 square feet.

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.