Roof Gutter Drain Pipe Size

Roof drain connected to an 8 in.

Roof gutter drain pipe size.

Many factors can effect the proper size of gutter. For larger roof drains the pipe may be smaller such as a 10 in. For example in the u k. If a roof s various drainage areas call for different size gutters go for the biggest one k style.

Use this downspout extension to divert water away from the foundation or connect to drainage pipe and catch basin to control drainage. The roof drain or gutter or drain piping or downspout leader size diameter other size constraints e g. 5 inch 2 500 square feet. 6 inch 3 840 square feet.

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 will be collecting water from 2 or 3 downspouts and sending it around the house to the street. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. For example a 4 in.

If a roof s various drainage areas call for different size gutters go for the biggest one k style. Following this logic it is possible that for roof drains 6 in. Designers specify compliance with bs en 12056 3 2000 that includes a calculation for the allowable capacity of the rainwater pipes. 5 inch 5 520 square feet.

A house in chicago has a roof whose actual drainage area is 1 000 square feet. The 6 in 12 pitch factor 1 1 multiplied by 1 000 yields an effective area of 1 100 square feet. Then use the information below to see what size gutter you need. For the vast majority of rains gutter and downspouts sizes considerably less than recommended will do the job.

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 a 6 in. Or less in diameter the piping will be larger in diameter than the roof drain.

The flexible design easily bends and holds its shape and can be extended from 25 in. Most of all is location and your average rainfall during a large downpour. Primary cause for water spillage is debri in the gutter. How do i figure how much each pipe can handle.

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

Problems with gutter sizing.