Roof Gutter Drain Pipe Size

How do i figure how much each pipe can handle.

Roof gutter drain pipe size.

I plan to use 3 corrugated pipe but would 4 inch be better. For example in the u k. The flexible design easily bends and holds its shape and can be extended from 25 in. My roof is about 1500 sq ft and this will be draining about half of the roof.

For the vast majority of rains gutter and downspouts sizes considerably less than recommended will do the job. Problems with gutter sizing. 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. The roof drain or gutter or drain piping or downspout leader size diameter other size constraints e g.

Primary cause for water spillage is debri in the gutter. Roof drain connected to a 6 in. Most of all is location and your average rainfall during a large downpour. Or less in diameter the piping will be larger in diameter than the roof drain.

Designers specify compliance with bs en 12056 3 2000 that includes a calculation for the allowable capacity of the rainwater pipes. Following this logic it is possible that for roof drains 6 in. Many factors can effect the proper size of gutter. 6 inch 3 840 square feet.

5 inch 5 520 square feet. 5 inch 2 500 square feet. I have enough slope but not sure what size drain pipe to use. Roof drain connected to an 8 in.

I will be collecting water from 2 or 3 downspouts and sending it around the house to the street. 6 inch 7 960 square feet. A house in chicago has a roof whose actual drainage area is 1 000 square feet. For example a 4 in.

If a roof s various drainage areas call for different size gutters go for the biggest one k style. 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. 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. Then use the information below to see what size gutter you need.

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. If a roof s various drainage areas call for different size gutters go for the biggest one k style. The 6 in 12 pitch factor 1 1 multiplied by 1 000 yields an effective area of 1 100 square feet. 5 inch 5 520 square feet.

For larger roof drains the pipe may be smaller such as a 10 in.