Roof Gutter Drain Pipe Size

The 6 in 12 pitch factor 1 1 multiplied by 1 000 yields an effective area of 1 100 square feet.

Roof gutter drain pipe size.

If a roof s various drainage areas call for different size gutters go for the biggest one k style. 5 inch 5 520 square feet. How do i figure how much each pipe can handle. 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.

Multiply the drainage area by the roof pitch factor and rainfall intensity to find out the adjusted square footage. 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. A house in chicago has a roof whose actual drainage area is 1 000 square feet. Problems with gutter sizing.

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. Designers specify compliance with bs en 12056 3 2000 that includes a calculation for the allowable capacity of the rainwater pipes. Roof drain connected to a 6 in. 5 inch 5 520 square feet.

6 inch 7 960 square feet. Then use the information below to see what size gutter you need. Roof drain connected to an 8 in. Following this logic it is possible that for roof drains 6 in.

6 inch 3 840 square feet. I have enough slope but not sure what size drain pipe to use. For larger roof drains the pipe may be smaller such as a 10 in. 6 inch 7 960 square feet.

The roof drain or gutter or drain piping or downspout leader size diameter other size constraints e g. I will be collecting water from 2 or 3 downspouts and sending it around the house to the street. 5 inch 2 500 square feet. 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. I plan to use 3 corrugated pipe but would 4 inch be better. For the vast majority of rains gutter and downspouts sizes considerably less than recommended will do the job. Many factors can effect the proper size of gutter.

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

My roof is about 1500 sq ft and this will be draining about half of the roof.