What is the proper slope/grade for waste pipe?

Question

This is for when I am putting a sewer pipe between my house and a sewer line.

Answer 1

2" pipe and smaller 1/4" per foot
3" - 6" pipe 1/8" per foot
The bigger the pipe, the less fall required. To much pitch water flows to fast and leaves solids behind eventually causing a blockage. To little pitch, the solids will eventually accumulate, causing a blockage. Or so they tell me..........

Answer 2

1% per code is the usual, or 1/4" per foot.

In reality, you will have a set elevation where your sewer comes out of your house, to a set elevation in the street for the sewer line, and as long as it is over 1%, or 1 foot drop for every 100 feet horizontal, it will flow properly.

Answer 3

For quick solution, put small level on pipe and keep the bubble up hill at each joint, most answer are right , put find your sewer pipe , how deep it is and bubble on the high side and you shold be fine ( put the bubble in the middle of the high side)

Answer 4

When I built my kitchen/bath addition, code required slope of 1/4" drop per foot. Some levels will have a vial with pitch marking so you can be sure of the slope.

There is nothing wrong with giving more pitch if you are unsure.

Answer 5

Usually it is one inch drop per foot length of pipe but this could change depending on the overall length and diameter of the pipe. To play it safe, I suggest you check with your city's or county's engineering department.

Answer 6

1/4" drop per foot.minimum

Answer 7

1 cm. per meter. abrupt sloping would leave the solids behind.

Answer 8

1/4 inch a foot, depending on where you live.

Answer 9

complex thing. look into at yahoo. this might help!