Trap Under Floor

The trap arm that connects horizontally from the vent pipe to the p trap must have a slope of 1 4 inch per foot sloping up toward the drain.

Trap under floor. The issue here is that the trap would be more than 24 inches. All traps must be installed on the same floor as the fixture served with the exception of tubs and showers. One acceptable variation which allows putting the p trap under the floor is to take a horizontal run of about a foot to slow down the force of the water hitting the trap under the floor. In any case putting it below the floor would violate the maximum length of the stand pipe code which is 30.

You can probably find that code bit in the dwv section not necessarily under washing machines. Care has to be taken to prevent installation of traps that are exposed to freezing conditions. There is no exception to the rule that every rule has an exception james thurber writer and cartoonist 1894 1961. There are usually limitations that the total length of pipe from the bottom of the sink to the trap must not be more than 24 or 36 inches.

What is the preferred method for hooking a dishwasher drain just under the floor. Can i install a p trap just 12 under the floor next to the foundation then into a y into a 1 1 2 pvc line. A trapdoor in the floor provides you with a quick and convenient method of moving between floors a closeable door in the floor of a loft or a way to access a crawlspace beneath your floor. This is used with kitchen sinks lavatories and laundry sinks.

Trap seal is the maximum vertical depth of liquid that a trap will retain measured from the crown weir and the top of the dip of the trap. I have heard that s traps are illegal so the only other option is to put a p trap just below the floor accessible from the basement. And 95 mm grating size provided at the top of floor trap with 8 mm diameter holes. As is stands i have a hole in the floor for directly below the sink.

The length of floor trap is 310 mm with minimum 80 mm diameter at the inlet end 30 mm diameter near outlet end and 73 mm diameter outside the outlet of floor trap. The trap must be accessible not hidden in the wall or between floor and ceiling etc but i don t see a prohibition specifically addressing the trap being under the floor. Making the trapdoor is just like creating any doorway in a wooden frame. If the sink has a pop up drain the tailpipe will need.

What fittings can i use from the flexible dishwasher drain hose to the 1 1 2.