help with re-directing soil stack etc in extension

[kjacko]

Hi all,
i have a dilemma with my extension where i need to re-direct my existing soil stack and bathroom outpipes through the wall to the outside of my extension.
See pics:
View media item 7827 View media item 7828 View media item 7829 View media item 7830
So hopefully you can see that it all wants to fly out to the left through the new wall where the ladder is just above the boiler exhaust which you can just see sticking out to the right of the downpipe elbow.

Mission Objective:
1. take the existing soil/vent stack AND 'T' piece and move it on to the outside wall where the current guttering downpipe is (which will be moved)
2. Get rid of the existing iron bathroom water waste pipe altogether..(the one with the hopper on)
3. Rotate the remaining elbow 180° in situ and fly a 110mm waste pipe to the left and out through the wall to join into the newly situated 'T' piece.
4. Somehow connect the smaller bath and basin waste pipes into the 110mm soil pipe before it goes outside. I was thinking somewhere above the left hand top window opener to give each pipe a nice drop.

Does this make sense?

Now given that the waste pipe needs to have a drop on it, how will it connect into the 'T'piece on the outside that would be at 90° to vertical (if you know what i mean)

Any suggestions would be most appreciated.
Thanks

 

[gas4you]

I don't have anything to do with soil pipes etc, but a few basics.

When the extension was built, did you have a new underground drain put in for connecting the new soil pipe to the existing drain set up?

If not you have problems.

A soil tee piece although appearing to be 90d is actually a couple of degrees off the exact 90, so giving the required fall.

 

[kjacko]

gas4you, thanks for the reply.

ok, i didn't post the pic, but there is one in my forum album showing existing drainage, at the foot of the ladder on the outside there is a channel dug where i will 'T' into an existing drain with a manhole, so that's not an issue.

As regards the 'T' being slightly off 90, yeah i can understand that, and that there is a little 'give' when connecting such a long length of pipe. However there will be no give coming through the wall, unless i drill a hole quite a bit bigger than the pipe, allowing for plenty of movement.
That said, it may not be an issue at all, i'm just pre-empting i suppose.

 

[gas4you]

If it is just the pipe going through the wall, then a 5" core drill will suffuce. If there is a connecting piece then you will need a 6" bit to accomodate this.

Perhaps those qualified in plumbing/drainage can comment/help further.

Is this being signed off by BC, or are you using a plumber who is registered with a plumbing competent persons scheme to notify these works?

 

[kjacko]

The extension been inspected and passed at each stage so far. The inspector approved the intended plans for the drainage re-direct and obviously once done he will be invited back to approve it all.

 

[kittedup]

That flue looks to close to the corner to me.

Plus the downpipe but you say that is going.

kittedup

 

[swidders]

Assuming the soil stack can go where you intend and is far enough from the flue (buidling control or whowever fitted the boiler should be able to advise you of this) then you seem to have it in hand.

With regard to how to join the waste water pipes to the soil pipe - use boss adaptors.

 

[swidders]

oh, any by the way, when you are using plastic pipe, don't forget to chamfer the ends (i tend to do this by scraping it against concrete) an silicon lubricant, to make sure that you don't rip the rubber seals and give yourself a fighting chance!!

 

[kjacko]

Thanks for the replies so far guys.
Below is a pic of the intended re-direct plan
View media item 8099The blue blob is the existing boiler exhaust. It's not going to move and will sit approx. 300-450mm below the soilpipe 'T'. Would this pass regs?
Also the boss straps to accommodate the 40mm bath waste (left) and the sink waste (right). If the 40mm pipes run into the 110mm at an angle other than 90° how would that work as the boss has a lip on that would surely only allow a 90° pipe insertion?
Thanks again for your advice fellas.

 

[swidders]

No idea about the flue and pipe clearance (am not a gas man!!)

With reference to boss strap - why are you taking the pipes downstream so far. If you took the bath at 90 to soil pipe, so it slightly slopes to the right, and the sink as an S shape parallel to soil pipe before knuckling into boss, then this will be fine - gravity and the slope will do the rest, and the rubber seal into the boss will allow removal for servicing and rodding if needs be in the future

 

[kjacko]

Thanks swidders, that's what i wanted to hear.
Just really wasn't sure if i should be using extra joints, but thats cool, i'm now reassured.

Thanks

 

[kjacko]

so, does anyone know the regs stipulating how far the soil pipe can be from the boiler flue?
On looking at the pic in the op, the flue is 1 bricks length away from the corner. The BC has been out at each stage and not said anything about it so far. Of course, that doesn't mean he's actually paid any attention to it.

Also, it took ages and a specialist to 'try' and match the bricks to the house as near as he could. Then i found out from a neighbour that a previous owner, now get this.......wire brushed the entire brickwork of the house It looks completely different to his (my adjoining neighbour) and hence the trouble getting anything near the colour.
When you look closely at the bricks you can actually see the marks left my the wire bristles, lol.