Washing Machine Drainage Problems
When problems do arise with washing machines, it’s usually either because there is no convenient trap or waste pipe to break into, or because you need to fit a standpipe and the existing waste pipe is too high. The diagrams below show two possible solutions.
One is to run a new length of waste pipe out through the house wall to a nearby gully. For this, you’ll need a hammer drill and heavy duty masonry bit long enough to pierce the brickwork.
The other is to connect a new run of waste pipe to a nearby plastic soil pipe using a fitting called a strap-on boss connector. If you’re lucky, the soil pipe will be inside the house (though it may be hidden behind vertical boxing). If the soil pipe is outside, you’ll have to run the pipe through the wall. Old cast-iron soil pipes are not suitable for connection in this way.
Arrange for the new waste pipe to slope fractionally so that the water drains correctly. (The exact slope is not critical.)
At a gully, run the pipe down below the surface of the grille (old open type), or connect into the spare inlet hole (modern closed type).
At a plastic soil pipe, fit a strap-on boss connector. Mark where to break into the pipe, then drill a hole for the new waste pipe using a 38mm (1/2") hole saw attachment for an electric drill. Fit the connector in the hole, and tighten thesecuring the strap.