Roof Gutter Drain Pipe Size

If a roof s various drainage areas call for different size gutters go for the biggest one k style.

Roof gutter drain pipe size.

5 inch 5 520 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. 6 inch 3 840 square feet. For the vast majority of rains gutter and downspouts sizes considerably less than recommended will do the job.

6 inch 7 960 square feet. Many factors can effect the proper size of gutter. Most of all is location and your average rainfall during a large downpour. 5 inch 5 520 square feet.

If a roof s various drainage areas call for different size gutters go for the biggest one k style. Roof drain connected to a 6 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. 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.

5 inch 2 500 square feet. A house in chicago has a roof whose actual drainage area is 1 000 square feet. My roof is about 1500 sq ft and this will be draining about half of the roof. I will be collecting water from 2 or 3 downspouts and sending it around the house to the street.

Use this downspout extension to divert water away from the foundation or connect to drainage pipe and catch basin to control drainage. For example a 4 in. Problems with gutter sizing. Primary cause for water spillage is debri in the gutter.

For example in the u k. 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. Or less in diameter the piping will be larger in diameter than the roof drain.

The roof drain or gutter or drain piping or downspout leader size diameter other size constraints e g. Following this logic it is possible that for roof drains 6 in. How do i figure how much each pipe can handle. I plan to use 3 corrugated pipe but would 4 inch be better.

For larger roof drains the pipe may be smaller such as a 10 in. Then use the information below to see what size gutter you need. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. 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.

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