Roof Drain Pipe Slope

Cleanouts in draining systems cleanouts provides access to the sewer for rodding.

Roof drain pipe slope. Pipes must slope slightly downhill to drain properly. Larger lines such as 8 pipe actually require less pitch due to the larger circumference of the pipe. In general plumbing codes require pipes less than 3 inches in diameter to slope a 1 4 inch per foot of run. 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.

Laying drainage pipes is a job for professionals but diyers can try their hand at less extensive drainage systems. Note that i said the drain pipe must be sloped rather than the french drain. Same logic with 1 8 slope 1 16 slope etc. A slope of less than 1 4 inch per foot will cause constant drain clogs and a slope of more than three inches will allow the water to drain without the solids.

Smaller pipes are more likely to experience blockages than larger pipes and therefore require a steeper slope. According to plumbing code drain pipe has to be sloped a minimum of 1 4 inch per foot and a maximum of three inches per foot or vertical. Sanitary drainage systems the purpose of a sanitary drainage system is to remove effluent discharged from plumbing fixtures and other equipment. The term slope is also frequently used and has the same meaning as pitch.

Ss525 2006 code of practice for drainage of roofs. Usually 1 8 per foot is plenty for drainage this is the same as the commonly recommended 1 slope. It is generally accepted that 1 4 per foot of pipe run is the minimum for proper pitch on a sewer line. Drain waste and vent pipe hanger spacing support of drain waste and vent dwv pipes.

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. The flat roof must have sufficient slope to allow water to flow towards the roof outlets. Tips on calculating drain pipe slopes use the longest level possible for your application for the best accuracy when the bubble on a level is about 1 4 of the way past the line it is about a 1 4 slope. All of your drain pipe with one exception must slope slightly downhill.

Slope of drain and waste pipes drainpipe sloping requirements vary according to the pipe s diameter. The standard slope is anywhere from inch to 3 inches per foot. An accurate calculation is essential for properly functioning plumbing.