Concrete floor - installing waste pipe - will i damage dpm?

[steve3000]

Hi,
My first post here - I'm planning on installing a downstairs wc in the house this summer & want to do as much of the work myself. Can anyone help me with advice?

The house is a 15 year old terrace and has concrete floors downstairs. The wc will be in the centre of the house and won't be near an outside wall - so I'm planning to run a channel in the concrete floor for the 100mm soil pipe - through the adjoining room, to the outside wall and sewage drain.

I guess I'll have to dig out the channel to below the dpm and run the soil pipe below the concrete level? How do I reinsate the dpm afterwards? Is it possible to do this successfully - or would I be better off scrapping the idea and going for a macerator? (don't like these tho...)

Many thanks!
Steve

 

[mattysupra]

i would go with option 2 and scrap the idea. Plus as its a downstairs toilet i guess that it will be for jimmy 's and not number 2's so cant see a problem with fitting a master-bater

 

[steve3000]

Thanks for the reply!

Is it really going to be too difficult? I'd prefer to get a real soil pipe in there if possible (would potentially allow me to add an en-suite in the room above at later date...).

How easy is it to join up the dpm afterwards? Had a builder round yesterday (for a different job) but he said he would fill over soil pipe with gravel and hardcore, then concrete up to dpm level, put in a liquid dpm to join up with the old dpm, add more concrete and finally fill over with screed. Does that sound right?

Cheers,
Steve