Roof Gutter Drain Pipe Size

Problems with gutter sizing.

Roof gutter drain pipe size.

5 inch 2 500 square feet. I plan to use 3 corrugated pipe but would 4 inch be better. Most of all is location and your average rainfall during a large downpour. For the vast majority of rains gutter and downspouts sizes considerably less than recommended will do the job.

If a roof s various drainage areas call for different size gutters go for the biggest one k style. Roof drain connected to an 8 in. Use this downspout extension to divert water away from the foundation or connect to drainage pipe and catch basin to control drainage. 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.

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. I have enough slope but not sure what size drain pipe to use. Designers specify compliance with bs en 12056 3 2000 that includes a calculation for the allowable capacity of the rainwater pipes.

A house in chicago has a roof whose actual drainage area is 1 000 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. 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. Following this logic it is possible that for roof drains 6 in. How do i figure how much each pipe can handle. 6 inch 7 960 square feet.

Then use the information below to see what size gutter you need. I will be collecting water from 2 or 3 downspouts and sending it around the house to the street. 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. Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage.

5 inch 5 520 square feet. Many factors can effect the proper size of gutter. 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.

My roof is about 1500 sq ft and this will be draining about half of the roof. The roof drain or gutter or drain piping or downspout leader size diameter other size constraints e g. For example in the u k. For example a 4 in.

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