Hi folks
I'm redoing the downstairs bathroom. The bath and basin currently drain in to an old cast iron branch going in to a cast iron rainwater pipe (from the gutters). 32mm is connected in by badly done wrapping. I reckon the rainwater cast iron joins the main drain underground but seeing as redoing it all I'd prefer to connect via boss in to the main (pvc) soil stack.
See diagram of soil stacks. Thinking about connecting 40mm waste either in at point A (under the floor branched in to the internal soil pipe (from upstairs en suite) where it flows horizontally (slightly sloping obviously) under the floor before going out the wall and joining the main stack) or point B in to the main stack.
Questions...
1. I know you can't connect below 450mm of the base of a stack. Does that mean point A is not OK cos it's not above 450mm of the base of the en suite stack? Or does that horizontal bit running under the floor not count as the base of the stack because actually it carries on and connects as a branch in to the main stack outside which has a much lower base underground? (This would be easy connection running my 40mm waste under the floor from bath and basin straight in to the soil pipe with a boss near the top half of the horizontal pipe. It's only about 2m away which is ok with 40mm I think?)
2. If I can't do A, then I need to run my 40mm waste under the floor and core drill through the wall and then connect outside via boss to the exernal stack. (I've got 1.2m plenty space for leaving the minimum distance from another connection and 450mm above base at ground level). Anything wrong with this?
I know both would work it's just what meets building regs. (By the way I'm in Scotland. I'm looking at part h which is English but struggling to find anything detailed and reckon it's same idea in all of uk right?!) Don't want a headache later as plan to sell house sometime and all it takes is a fussy lawyer or surveyor....
Thanks all...!
I'm redoing the downstairs bathroom. The bath and basin currently drain in to an old cast iron branch going in to a cast iron rainwater pipe (from the gutters). 32mm is connected in by badly done wrapping. I reckon the rainwater cast iron joins the main drain underground but seeing as redoing it all I'd prefer to connect via boss in to the main (pvc) soil stack.
See diagram of soil stacks. Thinking about connecting 40mm waste either in at point A (under the floor branched in to the internal soil pipe (from upstairs en suite) where it flows horizontally (slightly sloping obviously) under the floor before going out the wall and joining the main stack) or point B in to the main stack.
Questions...
1. I know you can't connect below 450mm of the base of a stack. Does that mean point A is not OK cos it's not above 450mm of the base of the en suite stack? Or does that horizontal bit running under the floor not count as the base of the stack because actually it carries on and connects as a branch in to the main stack outside which has a much lower base underground? (This would be easy connection running my 40mm waste under the floor from bath and basin straight in to the soil pipe with a boss near the top half of the horizontal pipe. It's only about 2m away which is ok with 40mm I think?)
2. If I can't do A, then I need to run my 40mm waste under the floor and core drill through the wall and then connect outside via boss to the exernal stack. (I've got 1.2m plenty space for leaving the minimum distance from another connection and 450mm above base at ground level). Anything wrong with this?
I know both would work it's just what meets building regs. (By the way I'm in Scotland. I'm looking at part h which is English but struggling to find anything detailed and reckon it's same idea in all of uk right?!) Don't want a headache later as plan to sell house sometime and all it takes is a fussy lawyer or surveyor....
Thanks all...!