4 inch run

[jaydebruyne]

Went to look at a job last week - leak from a sanipro unit on the first floor.. turns out that the unit is defective. When I investigated the pipework the installer has run the waste outlet from the macerator into a rainwater pipe outside!!!

I advised the lady how bad this was and that it needs to be rectified asap.

Anyway, she wants me to see if I can connect her bathroom to the main waste system. As far as I could see there wasn't a stack, just a 4inch elbow sticking out the floor on the ground floor for the downstairs loo connected to a run of 4 inch under the floor.

What I'm going to do on Monday is open up her celiling to see if there is enough height to run some 4inch under the 1st level flooring, open up the floor where this 4inch run is on the ground floor and tee into it.

But this would need to be vented wouldn't it? I need to check if there is a vent which serves a few houses (terraced) - as far as I can remember from college there can be one vented stack per 6 houses I think.

The more I think about this job the more I just don't want to do it.

What's the min fall for about 4 meters of 4inch before a vertical drop to the pipework under the floor? Is it even possible to tee into horizontal 4inch with a vertical branch? (Is the tee swept?)

 

[jaydebruyne]

So here are some pics of what I want to achieve -

Basically, behind the wall behind the toilet is where the extension begins. I have 8 inches room in total for about a 3m run which is plenty room (the empty run pictured).

It will then come out the right side of the utility room (where all the coats are) at ceiling level, I'll have to do a 90 from there to other side and then down to the collar sticking out the ground (where the flexi/elbow are going into).

The only real issues I have are:

1. I also need to run a basin and shower into this run behind the toilet which are currently plumbed into the sanipro unit behind the toilet. Not sure how I'm going to do this regarding space.

2. Going from the toilet into the cavity in the ceiling.. How am I going to get past the wall & joist?

Ay help would be fantastic!!

 

[jaydebruyne]

Is it possible to install a durgo aav (the ones you can fit below the flood level) next to a toilet inside some boxing - it'll be used to vent that bathroom and toilet on floor below.

 

[rpm]

Think McAlpine do one.

 

[jaydebruyne]

Think McAlpine do one.

But it is possible? To tee off after the toilet for the AAV to vent both toilets?

 

[jaydebruyne]

Also, since when did shared vents become illegal??