Soil Pipe Under Concrete Floor

Levelling the false floor on the unlevel concrete floor was a challenge but as i did it all myself i had the time to custom cut 24 wood supports to provide even support for the 1 marine ply floor.

Soil pipe under concrete floor. I ve dug up the concrete floor and laid a 4 metre 110mm brown soil pipe that runs to the back of the house and down to the main drain. From the picture attached it looks as if theres a clay downpipe with a 90 degree bend that takes it to the stack. There used to be a rule of thumb for pipe gradients in the old pipe sizes too. Raised floor also provides space for hiding hot and cold pipes serving the basin and cistern.

Considerations cutting through a concrete floor should be a last resort. 4 inch should be 1 in 40 6 inch 1 in 60 9 inch 1 in 90. That s if point b is supposed to be below point a else problems. If the drainage is already ventilated additional ground floor appliances eg.

Its known as the pipe invert level. To stop smells entering a building the open end of the ventilating pipe should be at least three metres to the side of or extended to 0 9m above any opening into a building. A peice of upvc pipe has been cemented on top of the clay pipe and the old pan connector was fitted to that. The centre of the soil pipe is 150mm from the wall see pic below.

Once the concrete is out you can dig in the remaining trench to remove the sand or soil before running the new plumbing. A wc and washbasin may be connected directly to the drain without a ventilating pipe. Soil pipe under concrete floor i m building a ground floor under stairs toilet. This sits about 100mm down from the floor level.

The builder is going to bring in 2 x 110mm soil pipes under the new concrete slab for the extension and then bring them vertically up through the slab and celotex insulation into the en suite via an elbow on each. I ve goolged it but i can t find a toilet cistern combo so that the cistern will sit against the wall. Under no circumstances should this pitch or grade be less than 1 8 per foot. The soil pipe should enter the house at least 1 foot below the finish grade of the basement floor and it should have a pitch of about 1 4 per foot towards the outside of the house.

The cement flange protrudes about 25mm above the floor level. So long as the invert level at point a is higher than point b water will flow.