Thread: Any plumbers here?

Start googling "sump pumps" - you'll find them in a lot of basements in the US to do exactly what you are looking for. They come in two variations - a submersible pump that sits at the bottom of the sump that kicks in once the water reaches a certain level, or a surface mounted pump that sits above the sump and does the same thing.

And yes, you'll obviously want to dig out a sump and line it before tiling.

Plumb your floor waste to a rubble pit outside. Much simpler and cheaper.

Originally Posted by jc109

Plumb your floor waste to a rubble pit outside. Much simpler and cheaper.

How do I do that when outside is about 8" higher?

Ive not seen it so hard to say, but you could run a long pipe to lower ground, or maybe dig a deep pit with higher than normal sides so that surface water doesn't pool in it. And if this didn't fix the problem outright you could still whack a pump in there. I would think it better than running the pump inside if you didn't have to.

Originally Posted by Ranga

How do I do that when outside is about 8" higher?

It's hard to propose an exact solution not being able to see what surrounds your house, but if your ground offers good soakage then you can dig a soak pit about six or seven feet deep and fill it with rocks or gravel - we used to drill holes in a 50 gallon drum and bury that, then fill it with rocks as it stops the soil backfilling it. Then dig a trench from the soak pit to the edge of the house and go underneath the wall. As long as the trench is deeper than 8", you'll be able to run a pipe in that is lower than the floor, and plumb a drain to that. However, depending on the terrain outside, and rainfall catchment, you run the risk of water from the outside flooding the basement...

Where is the washing machine draining to??? At some stage outside the house it must be draining lower than the basement floor, otherwise you'd have a washer half full of water all the time...

Cutting the floor, digging a sump and lining it is good and fine. Adding a small submersible sump pump is also a good idea... however...you need to power the pump safely (in water!) and also (somehow) run a drain again across the top of the floor which people in their rush to clean up won't trip over....

FWIW: Try a different approach: If the washing machine is in a corner or next to an external wall, you could build a 6" hob (like a shower recess) in the corner, slightly larger in area than the footprint of the washing machine, but place the machine just behind the front edge of the hob, mounted on 4 besser blocks.

Excess water pools within the bunding provided by the hob. The pump sits on the "floor" behind the machine and its waste pipe could run through the external wall and out onto the grass or into a rubble pit as suggested by jc109. Take the power for the pump from the GPO which serves the washing machine. This way if the machine overflows, the water is all contained under it and you don't have soapy leaking all over your expert tiling job!

You may need a non-backflow valve in the waste pipe... alternatively, if the pump pushes the waste say 30cm (a foot) "uphill" to/through) the wall and once outside it's all downhill, then most of the waste water will syphon itself out...

Unless you will use gravity to drain the laundry, you don't need an external pit. The pump in the washing machine currently drains into the waste water outlet, your sump pump can do the same.

Re: submersible pumps , buy a bilge pump and float switch from a marine store and power it from a 12V transformer or car battery type supply. I kept a basement dry for a year that way before I could afford to dig a looong drainage ditch to a lower outside level.