moving soil pipe in bungalow

[jimst]

Hi - need some advice....I need to move a bathroom to a different location in a bungalow with a solid floor. The hot/cold can go up through the roof void and down stud walls but I can't decide what to do about the soil pipe.

Option 1: Break/dig a trench in the floor approx 4m long and connect to pipe used by existing WC. Hard work and I am concerned about re-instating the dpc membrane....would this be a problem? I can't see how it would be possible to join it or overlap in a trench.

Option 2: Connect to an underground pipe at the front of the property and run 8m around the front/side of the house....more digging but might be less work overall as the pipe can go through the wall above ground level.

Advice please.....

 

[tony1851]

Although a longer run externally,it would be a far better option than trying to do it internally. You would never be sure the dpm was properly sealed, and the dust/mess would be considerable.
If memory serves me correctly, you may have to put a vent pipe in if the branch to the drain is >5m long.

 

[Hugh Jaleak]

Make sure you can get an adequate fall over the distance. Rule of thumb is 1:40 or 25mm per m, although may get away with slightly less.

Chamber needed at any change of direction in the drain.

 

[jimst]

Although a longer run externally,it would be a far better option than trying to do it internally. You would never be sure the dpm was properly sealed, and the dust/mess would be considerable.
If memory serves me correctly, you may have to put a vent pipe in if the branch to the drain is >5m long.

thanks.....not too worried about the mess, but could do without future probs with damp.....! Awaiting visit from building control.

 

[jimst]

Make sure you can get an adequate fall over the distance. Rule of thumb is 1:40 or 25mm per m, although may get away with slightly less.

Chamber needed at any change of direction in the drain.

It would have to go round a 90 deg corner so would I need a proper manhole or just a chamber for rodding etc?

Fall is ok.....20cm over 8m which I can get fairly easily.

 

[noseall]

Outside run - hands down.

Inspection chamber fitted at change of direction and fit another outside the proposed bathroom.

Build a stack and connect the loo into it, then into the new IC. This will need venting 900mm above any openable window within reach. Stick a balloon grate in the top.

At the same time fit a gully to collect the bath/basin/shower waste or boss into the stack if convenient.Again connect into one of the inlets on the new IC.