We are about to install a bathroom in a new location at the front of a Victorian terrace (to regain rear bedroom) & as such we will be running a new soil pipe.
The plan is to chase it in to the wall slightly in the hallway downstairs, 'hiding' it within the lobby door lining design, using acoustic soil pipe to reduce chance of noise problems. Next door neighbour is on board with it, building control say there is no reason not to (although unusual), and structural engineer is happy. I've considered and mocked up many alternative routings, but getting it across the hallway would mean too many un-roddable bends.
The main issue is getting it past the first floor joist which I would rather not cut and trimmer joist for strength reasons, hence I have designed in two 45* bends as you will see from the video animation of my sketchup model :
The second issue will be the fact that the outside inspection chamber will be at too low a level & therefore would have a gradient of much greater than 1in40 - 1in80. I have therefore mocked up a backdrop shaft. There is a risk this will end up too close to the to-be-constructed new wall of the extension (with mini-pile foundation) - the only way to reduce this risk would be to have the backdrop shaft running parallel to the back wall of the house, but this will introduce more 'bends' - although admittedly at easily roddable areas (but I'd prefer to have a design least prone to clogging up in the first place!)
Potentially 5 inlets are needed in the chamber before the backdrop shaft - the main bathroom (plus loft bathroom), the understairs toilet/washing machine, the kitchen sink/dishwasher and one or two rainwater inlets from guttering (it's a combined sewage/rainwater victorian sewer)
Anyway, how does this look? Any thoughts/suggestions?
One big question is which fixed point to we work from when installing this... from the bathroom, dropping down, getting the rest bend situated then digging the correct gradient in the subfloor towards the inspection chamber then setting the height of the new access chamber/inspection chamber then fitting the backdrop shaft between the two chambers? Or the other direction? Any thoughts from those with more experience would be massively appreciated since I feel like its one of those things you could paint yourself into a corner with and no matter which way I think it through, I can't come up with a definitively obvious answer!
Here's a model of the house (current and proposed rough future design) for reference :
Edit : A Mascar bowl has previously been suggested but I get a sense they aren't used much or liked. Is this purely cost, or are they bad for blockages?
P.S. I also hope to bring the bath trap above the floorboard level to avoid cutting the original floorboards. Please ignore the pipes that don't quite meet - it is difficult to model in sketchup & is just to give a rough visualisation!
The plan is to chase it in to the wall slightly in the hallway downstairs, 'hiding' it within the lobby door lining design, using acoustic soil pipe to reduce chance of noise problems. Next door neighbour is on board with it, building control say there is no reason not to (although unusual), and structural engineer is happy. I've considered and mocked up many alternative routings, but getting it across the hallway would mean too many un-roddable bends.
The main issue is getting it past the first floor joist which I would rather not cut and trimmer joist for strength reasons, hence I have designed in two 45* bends as you will see from the video animation of my sketchup model :
The second issue will be the fact that the outside inspection chamber will be at too low a level & therefore would have a gradient of much greater than 1in40 - 1in80. I have therefore mocked up a backdrop shaft. There is a risk this will end up too close to the to-be-constructed new wall of the extension (with mini-pile foundation) - the only way to reduce this risk would be to have the backdrop shaft running parallel to the back wall of the house, but this will introduce more 'bends' - although admittedly at easily roddable areas (but I'd prefer to have a design least prone to clogging up in the first place!)
Potentially 5 inlets are needed in the chamber before the backdrop shaft - the main bathroom (plus loft bathroom), the understairs toilet/washing machine, the kitchen sink/dishwasher and one or two rainwater inlets from guttering (it's a combined sewage/rainwater victorian sewer)
Anyway, how does this look? Any thoughts/suggestions?
One big question is which fixed point to we work from when installing this... from the bathroom, dropping down, getting the rest bend situated then digging the correct gradient in the subfloor towards the inspection chamber then setting the height of the new access chamber/inspection chamber then fitting the backdrop shaft between the two chambers? Or the other direction? Any thoughts from those with more experience would be massively appreciated since I feel like its one of those things you could paint yourself into a corner with and no matter which way I think it through, I can't come up with a definitively obvious answer!
Here's a model of the house (current and proposed rough future design) for reference :
Edit : A Mascar bowl has previously been suggested but I get a sense they aren't used much or liked. Is this purely cost, or are they bad for blockages?
P.S. I also hope to bring the bath trap above the floorboard level to avoid cutting the original floorboards. Please ignore the pipes that don't quite meet - it is difficult to model in sketchup & is just to give a rough visualisation!
