Roof Gutter Drain Pipe Size

Roof drain connected to a 6 in.

Roof gutter drain pipe size.

Then use the information below to see what size gutter you need. A house in chicago has a roof whose actual drainage area is 1 000 square feet. How do i figure how much each pipe can handle. 5 inch 2 500 square feet.

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. Problems with gutter sizing. 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.

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. Primary cause for water spillage is debri in the gutter. 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. If a roof s various drainage areas call for different size gutters go for the biggest one k style.

Or less in diameter the piping will be larger in diameter than the roof drain. For example in the u k. 6 inch 7 960 square feet. The 6 in 12 pitch factor 1 1 multiplied by 1 000 yields an effective area of 1 100 square feet.

6 inch 3 840 square feet. I plan to use 3 corrugated pipe but would 4 inch be better. Use this downspout extension to divert water away from the foundation or connect to drainage pipe and catch basin to control drainage. If a roof s various drainage areas call for different size gutters go for the biggest one k style.

6 inch 7 960 square feet. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. For example a 4 in. Most of all is location and your average rainfall during a large downpour.

5 inch 5 520 square feet. Designers specify compliance with bs en 12056 3 2000 that includes a calculation for the allowable capacity of the rainwater pipes. The flexible design easily bends and holds its shape and can be extended from 25 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.

I have enough slope but not sure what size drain pipe to use. Following this logic it is possible that for roof drains 6 in. 5 inch 5 520 square feet. The roof drain or gutter or drain piping or downspout leader size diameter other size constraints e g.

Many factors can effect the proper size of gutter.