Loft bathroom conversion

[Coybro]

HI can i pick some brains please....... I've got a loft conversion which was completed a few years ago which is one bedroom and a separate storage room which Is now wanted to be converted into a shower room.
The roof is pitched and studed off down the length of the rooms so there is a crawl space either side and the length of the rooms.
The storage/shower room is at one end and I'm trying to work out the waste from toilet basin and shower.
It is a three storey property and there is a stack that serves two bathrooms on lower levels which vents in the crawl space in the loft conversion.
It is 4-5 meters away from the proposed shower room.
So my questions are is it possible to use this stack?
Am I doing anything wrong connecting all this via the top of it?
Can I connect this room to the top of the stack and put an air valve on top of that?
I have from the top of the joists (where it vents) to the height of the back of the toilet for the fall but how would I support the pipe height in the crawl space for this fall?
And best way to waste these three appliances together?
Have thought about a saniflo but in my experience they are not a great idea.


Any thought appreciated thanks

 

[stevetheplumber]

just put the soil pipe clips on blocks of dimishing sizes to get a fall or if between joists suspend on patent band strapping

 

[iiplumbing]

Hi coybro

what water system have you got to run supplies up there?

if its pressurised unvented then your ok, if not where is the storage tank?

i have converted my 3 story to a 4 story. Master bedroom with en suite. Loft had two stacks one in a corner the other in middle down one side, lots to consider here, will respond more fully when I get the chance

russ

 

[rpm]

Only use a macerator or any pump system when you have no other choice. I work on them every day and that is my honest advice.