Allthegearnoidea

Sorry, I've just realised that isn't too clear. This is what it would look like from inside the bathroom, so under 3m of 40mm from the bath. I'm just unsure about the transition into the 110mm, as I haven't seen it done this way before...

Hello All! We have a ground floor extension underway, and I need to get the drainage from the existing upstairs bathroom sorted before the roof can go on. We're adding a new W/C downstairs which has necessitated moving the soil stack over a few meters. (The underground drainage is already in place and signed off by building control with the upstairs W/C connected temporarily.) Moving the soil stack leaves me with the problem that the bath waste is now more than 4m away. I understand the max run for 40mm waste is up to 3m, and 50mm is up to 4m. This is what I have in mind. Blue = 40mm bath waste Green = 32mm basin waste Red = 110mm I was thinking it would be sensible to put rodding points in at A & B (with inspection covers internally). I'm planning to use one of these (or similar) for the 40mm to 110mm connection. Here's the house / extension in profile, so you can see that most of this pipework will be boxed in internally. So you can see the full picture, this is the arrangement of the upstairs W/C, showing what it would look like if 40mm pipe was used for the full run. The last diagram also shows the boiler condensate which I need to re-route into the bath waste. I plan to get this particular bit done by a Gas Safe registered plumber, but I'd still like to have a vague understanding of what needs to happen here so I can plan the other pipework accordingly - I'm not sure it's quite as simple as plumbing the condensate drain into a tee below the bath. Does the arrangement look OK (ie., compliant with building regs), and does anyone have any clues on what needs to happen to plumb the condensate drain into the bath waste? Thank you for any advice!

Hi All, I'm glad to have stumbled upon this fantastic resource, as we've started a single-storey extension and I have a lot of questions! Fingers crossed I'll be mostly OK once it's watertight, but everything up to that stage is all new to me. After having some proposals done by an architect we know, we approached various builders for pricing and at that stage realised we would need to contract individual trades, do as much as possible ourselves, and have a lot of patience to be able to do this on our budget. To date, the groundworks are complete (although, the drainage installer forgot the connection to the new W/C and is now having to dig up part of the slab) and walls are up. I spent most of yesterday covering up the cavities to stop the insulation getting wet over what remains of the winter. I'm waiting on advice from a structural engineer on building the roof, as the low pitch has made things a bit difficult and I have only millimeters to spare. I'm currently struggling with making sure the drainage from the existing upstairs W/C is building regs compliant, and making myself very confused...thread pending. I'm pretty good with AutoCAD and Google Sketchup, and being able to visualise things in CAD has been a real help.