Drainage run questions

[Vijay]

Morning,

 

Just looking at my drainage runs and wondered a few things:

 

My drainage runs are inside the envelope. Is there any reason I couldn't connect downstairs toilets to the stacks that drop down from upper floors?

 

For a kitchen island, would that need it's own 110 waste pipe or could I run a 50mm waste pipe from the island and join it to the 110 waste pipe that serves the kitchen sink and utility room? 

 

Cheers

 

Vijay

[Mr Punter]

Fine to connect downstairs WC to stack that goes to upper floors.  Make an access at the base of the stack for rodding downstream.

 

50mm is fine for kitchen waste.

[Vijay]

Cheers

 

Do you mean something like this for rodding access? http://www.buildbase.co.uk/hunter-soil-s309-110mm-grey-100008825-2811452

 

Sorry, do you mean 50mm is fine for the waste from a kitchen island?

[Mr Punter]

Yes, or this http://www.screwfix.com/p/floplast-access-pipe-110mm/42197

 

Yes, the kitchen sink waste needs to be min 40mm but I think bigger = better.  Others here know far more than me.  I hate plumbing.

[PeterW]

50mm from the island, use a swept tee at the point it runs into the slab and bring the other end of the tee up with a 45 degree bend and a screwed access plug on it. That way you can get a rod into it with care...!

[Vijay]

Cheers Peter. So you mean the actual 50mm pipe would go through the slab at 45 degrees?

 

Would the 50mm drainage pipe for an island run under the beam and block floor like the other drainage or would it be put say within the floor insulation?

[Steptoe]

2 hours ago, Vijay said:

Cheers Peter. So you mean the actual 50mm pipe would go through the slab at 45 degrees?

 

Would the 50mm drainage pipe for an island run under the beam and block floor like the other drainage or would it be put say within the floor insulation?

The 50mm to the island is vertical off the swept T , the 45 just has a short piece coming up at an angle to allow for rodding in future if required. 

In my understanding,

which is quite a good idea imo..

 

[Vijay]

Penny finally clicked! lol thanks guys.

 

So, would the 50mm drainage pipe for an island run under the beam and block floor like the other drainage or would it be put say within the floor insulation?

[PeterW]

2 hours ago, Vijay said:

Penny finally clicked! lol thanks guys.

 

So, would the 50mm drainage pipe for an island run under the beam and block floor like the other drainage or would it be put say within the floor insulation?

 

I would put it into the insulation and then screed over it. 

[Onoff]

My 50mm bath waste was part recessed into the 150mm PIR then came up at an angle into the slab. All made good with gun foam before the slab went down:

 

 

[Vijay]

Brilliant, thanks chaps