MDPE pipe concrete slab

[anhartwa]

Hi, In the process of a new build and we have routed a MDPE pipe through a lintel in the DPC but unable to bend it to the correct location due to the bend radius. I have now made the bend radius suitable for the bend but the pipe has no support underneath. Will it be better to put in a 90 degree bend and then run vertically up the DPC to floor level or will this be ok as we need to put in the sand, insulation and concrete on top. I take it that the MDPE pipe will need some ducting over it?

The waste pipe for the toilet is also around 50mm from the rear of the brickwork is this adequate? The MDPE for the mains water is 400mm from the waste pipe.

Thanks

 

[ShaunCorbs]

Sorry don’t understand the question you want the mains on the left of the underground waste also no 50mm isn’t enough as you have plaster etc

Off a finished wall waste needs to be around 105mm for a stnd toilet to the centre you plasterboard could end up at 30-75mm

 

[anhartwa]

Hi, thanks for replying, I have annotated the drawing sorry for the confusion. The red arrow shows the gap between the wall and the pipe where it bends upwards towards the finished floor level. I'm not sure if over time this will put undue pressure on the pipe and cause it to leak at which point the concrete would have to be taken out to repair. This is where I was thinking a 90 degree bend under the type 1 would help.

The waste pipe is 600mm from the left wall so we don't have much room on that side to route the mains water pipe. For the 105mm are you referring the to the green lines in the updated diagram? The length of the bathroom is limited so I wanted to keep the pipe as close to the wall as is feasible.

 

[ShaunCorbs]

I see can’t you dig down more also pipe insulation is a must or a sleeve

Also ideally you want 400mm from a wall to toilets and yes green is 105 off finished wall

 

[anhartwa]

I see can’t you dig down more also pipe insulation is a must or a sleeve

Also ideally you want 400mm from a wall to toilets and yes green is 105 off finished wall

Thanks, if we did dig more out then the bend in red would be underground and be supported so that is a good suggestion.

 

[anhartwa]

I see can’t you dig down more also pipe insulation is a must or a sleeve

Also ideally you want 400mm from a wall to toilets and yes green is 105 off finished wall

sorry, to clarify is the 105mm to the centre of the 110mm pipe or to the edge of the pipe facing the wall?

 

[ShaunCorbs]

Centre of pipe from finished wall inc covering for a stnd toilet

 

[anhartwa]

Many thanks for your help