MortarThePoint Posted September 8, 2023 Share Posted September 8, 2023 We're changing the layout of the bathroom (see images below) to move the toilet. There is a hole in the concrete floor that is poorly placed but needs to work. I originally planned to use a Double Branch (SP230) to route the pipes to the two toilets that need to be served by this stack. That was a bad plan due to the resulting size of the box-in, but we're looking to move one of the toilets now anyway. A Corner Branch (SP232) would work a treat, one socket heading to the wall and one along the wall, but the are fabricated to order. Even with the corner branch, the socket pointing at the wall would be a bit too long so need a large hole in the wall to work. What I have arrived at is in the diagram below. It's a bit weird in that it involves mounting a double branch at 45 degrees. The concern is around cross flow. Is this a crazy idea of something that happens? Room Layout Change: Original Plan: Link to comment Share on other sites More sharing options...
ProDave Posted September 8, 2023 Share Posted September 8, 2023 I think "swapped contents" is the issue. Much less likely as the 2 pans are not directly back to back. When I needed a corner branch I gone one off the shelf from someone on ebay. Looking again there are plenty there but some at silly prices. Link to comment Share on other sites More sharing options...
MikeSharp01 Posted September 8, 2023 Share Posted September 8, 2023 Why would you get cross flow at 45 Degrees it (the fluids / solids) will get broken up by the bends before they get to the drop, start to fall as soon as the bend starts and worst case they hit the bend lower down on the other side and anything that might 'stick' will be washed away by the next flush on the other WC plus you have great rodding access down the top hole of the three way SP230. 1 Link to comment Share on other sites More sharing options...
MortarThePoint Posted September 8, 2023 Author Share Posted September 8, 2023 (edited) 8 minutes ago, ProDave said: I think "swapped contents" is the issue. Much less likely as the 2 pans are not directly back to back. When I needed a corner branch I gone one off the shelf from someone on ebay. Looking again there are plenty there but some at silly prices. The toilet the other side of the wall would be after a couple of 90 degrees so I think unlikely to receive any gifts from the ne in this room. It's the other way that I'm more concerned about as the pan would be directly connected to the branch. It could have a small vertical offset though to help Edited September 8, 2023 by MortarThePoint Link to comment Share on other sites More sharing options...
MortarThePoint Posted September 9, 2023 Author Share Posted September 9, 2023 I guess this is a possible solution to cross flow. Rodents shouldn't be problem as we are having a sewage treatment plant so a closed system as far as a rate is concerned. Anti Back-Flow and Rodent Barrier Valve https://mcalpineplumbing.com/wc-connectors/wc-connector-accessories/arb-1-anti-back-flow-and-rodent-barrier-valve Link to comment Share on other sites More sharing options...
MortarThePoint Posted September 9, 2023 Author Share Posted September 9, 2023 This is where I am ending up I think. Not using the 45 degree double branch but a couple of single branches (SP190) instead. The one facing the floor is to be rotated 90 degrees to face sideways. This does increase the size of the box-in, will need to extend 820mm along the wall behind one of the toilets, 820(l) x 200(w) x 240(h) / 360(h) . If I need to I can attach a smaller AAV to the boss on the horizontal branch. It leaves the socket for the first toilet about 205mm plus the distance between the first branch edge which if I don't use a soil pipe offset or widen the hole is 70mm from the wall. If I then use a compact offset pan connector the toilet's spigot needs to be 205+70+31=306mm from the wall. That won't work with a Close Coupled toilet (unless a box-in behind toilet all the way up) so will have to be a more tradition style like the one below. If I don't use a soil pipe offset, there is possibly room for a 3-way boss to connect the other en-suite's shower/basin (40mm) to. If not it will mean I have to have an ungodly 3no. bend snaking to get it to a boss below the HCF. The side boss (facing the wall) of the first branch could have the macerator connected to it. I wondered about using an access 90 (SP169) but fear it would create turbulence in the flow from the second toilet which wouldn't be good. Hopefully a blockage there is unlikely(?) Plan View: Cove Low Level Toilet incl. Lever Cistern + Seat Link to comment Share on other sites More sharing options...
MortarThePoint Posted September 9, 2023 Author Share Posted September 9, 2023 An adaptation to move it closer to the wall. 210mm + 36mm for a 20mm or 40mm Offset Rigid WC connector (or MACFIT 20mm / 40mm) and minus ~16mm for plaster and tile give >=230mm for back of cistern to wc connector distance. That may allow some close coupled, but certainly plenty of traditional style options. (a straight option is unlikely to work but is MAC-1 . About 200mm between the centre line of the loo in this room and the higher part of the box-in. That allows the pan to be up to 400mm wide at that point which is unusual (most narrower than that at their widest). Still another boss to use for a 32mm pipe. Also a second new boss to use below the floor for a 50mm shower waste. Link to comment Share on other sites More sharing options...
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