I'm trying to work out the best way to solve our drainage needs.

We have a slow radius bend at the base of our stack in the corner of where our bathroom will be.

At the moment, due to drainage level constraints outside, the base of the slow radius bend at the bottom of the stack is level with the bottom of our 150mm Hardcore layer.

So we have a build up of 150mm Hardcore, 3 x 100mm EPS layers, and then a 150mm slab. This slab will be our finished bathroom floor. We'll have a small kerb on the shower and the shower floor will be raised slightly by about 20mm or so, to accommodate the grid, tile and waterproofing measures that might be needed.

I need to get my drainage planned right (amongst other things) before the slab is poured.

I would like to run my shower waste pipe from the grid, directly down through the slab, and then have a P trap to stop smells, and run my 50mm pipe along through the top layer of insulation until it meets the soil pipe from the WC.

I would like to do similar with the WC. take it down below ground and along.

Again the sink could drop down into the floor to join the shower pipe.

Is it ok to put waste pipes below concrete slab?

I'm going to be cutting it fine to have my lowest connection point above the 450mm minimum connection height. I mean it might be nearer 400? is that likely to be an issue?

I could raise it higher, but then it might be pushed up within the concrete slab, which i don't like the idea of, wouldn't it weaken it?

any better ideas out there?

thanks!

this is what our foundation build up looks like.

bit reluctant to chop away at the ICF wall insulation, although we do have 100mm internal to play with. would it be wiser to run the pipework in the wall?

Posted By: phil303I would like to run my shower waste pipe from the grid, directly down through the slab, and then have a P trap to stop smells,

Shower wastes normally include traps that are accessible from within the shower. P traps are normally accessed externally. It sounds like you're designing an arrangement where you won't be able to clear the trap when necessary.

Also, don't forget rodding arrangements if you're putting bends under the slab.

It goes up through the ceiling, along within the floor, and then meets another WC in the floor above.

Make sure you have designed all the pipe runs in the floor in advance for the WC and whatever other wastes have to join the soil pipe. I didn't and we've ended up with the soil pipe running on top of the first floor because of all the other wastes and ventilation ducts that are in the ceiling void. Luckily, it's the plant room that has the pipe running through it, and a durgo in the corner, so it doesn't matter.

re Klargester Bio Disc System - possibly the wrong thread....but ......

We used one of these for over 12 years at our last place.
It was brilliant - emptied once or twice a year, serviced and replacement of bearings once last year.
Survived being powered down when a contractor went through the power supply and didn't tell us - motor submerged for 48 hours at least - emptied/cleaned, powered up and worked OK.

Quiet, not at all smelly, and worked a treat.

So, just to bring balance, we liked ours very much and are about to instal one at our new place.

<blockquote><cite>Posted By: Yanntoe</cite>re Klargester Bio Disc System - possibly the wrong thread....but ......

We used one of these for over 12 years at our last place.
It was brilliant - emptied once or twice a year, serviced and replacement of bearings once last year.
Survived being powered down when a contractor went through the power supply and didn't tell us - motor submerged for 48 hours at least - emptied/cleaned, powered up and worked OK.

Quiet, not at all smelly, and worked a treat.

So, just to bring balance, we liked ours very much and are about to instal one at our new place.</blockquote>

Hi Yanntoe

Thanks for the heads up. I am about to add further evidence why the Klargester bio disc System is not fit for purpose in a more technical format. I am are not saying all their systems are not fit for purpose only the model I have which a BD Model!

I am very pleased to hear that your system proved its worth. However there are a number of these systems around mine happens to be a BD model which is designed to cope with up to a population of 25 and up to 4 households.

To clarify matters could you please confirm your model number and motor. The motor installed in my model is IP rated 54 which is recommended by Klargester for this BD system. However the motor manufacturer quotes in its technical data and I quote "Installation outdoors or in wet areas is not permissible without special protective measures"

Any motor that has been installed initially and subsequent emplacements have not been submerged in water or been left idle without power or operation whilst left in situ.

I have attached a photograph of the motor as it was removed. You can see how new it is.

I look forward to hearing from you with regards to your Bio Disc and motor Model