HELP, let down by plumber, correct advice needed asap!

[David Lowth]

Hi, i have unfortunately been let down and need to get some work completed before saturday that will comply with building regs. Being a novice i hope someone can help.

I Need to do first fix for 2 bathrooms on ground floor using block and beam. The soil pipes come in to the middle of the walls from the outside and not in the corners where the toilets will be. Its block and beam floor, whivh will have 100mm celotex then screeded on saturday.

1. Should i cut the soil pipes near the wall and put a 90 110 elbow to move it along the wall then another 90 110 elbow to bring it verticle through a block into the room for each toilet

2. What is the best way to run the waste pipes? Each room has sink and bath / shower which needs to connect to this soil stack. And one room will have a dishwasher coming through an internal wall to join one of the sinks.
Should the wastes go straight under the floor and join the soil pipe using y bends and a boss adapter? Or should they go on top of the block and beam under the celotex and join the soil pipe in the room itself?

3. Whats the best way to join the 40mm waste pipes to the soil stack? And i assume the sink will be a 32mn pipe, do i just want an adapter to make it 40mm somewhere ?

Any help really appreciated.

Thanks

 

[Burger]

You probably need to post some photos, and possibly contact one of the plumbers on here? Maybe post where you’re located?

 

[David Lowth]

Ok thanks, Ill be able to post a floor plan shortly, cant get actual pictures of jib till the morning unfortunately.

Im confident i will be able to do it myself, i just need a pro to tell me what will comply with building regs and what type of boss or do i need a manifold and have seperate pipes. Are you allowed the wastes under the block and beam flooring?

Its ringwood near bournemouth.

 

[David Lowth]

Heres a floor plan to give you some idea. The soil pipes coming in where the pen lines are

 

[ShaunCorbs]

Sounds like the waste has been put in the wrong place

110mm straight into the toilets then take everything through the wall into the outside stack

 

[Harvest Fields]

As above. I do not do first fix often but even I can see the wastes are in the wrong place. You may get away with the one by turning the toilet 90 degrees

 

[David Lowth]

Ah ok, thanks.

Ill move the one toilet 90* and look at getting the other soil pipe moved, although its all back filled with access gulleys outside. Ill get the shovel out.

The bath and shower ill see if they can go straight through the outside wall. ( is it normal for a shower to go through an outside wall?) Im guessing you guys have probably seen this?

As for the sinks and washing machine.. where would you take them to? Over the block and beam and under the celotex also to an outside wall? Or something else?

 

[David Lowth]

The sinks will be cabinet style sinks with cupboards underneath. It obviously wouldnt look as neat but would you think boxing and running one behind the bath to the outside wall, and one boxed in and under the shower to get to the outside wall that way?

If theres a way without boxing in that would be the preferred method

 

[ShaunCorbs]

Yes normal, shortest route

Phone building control up and get them out and ask them how they want them run as there siting it off, saves any surprises when they don’t like something

 

[ShaunCorbs]

Will draw something up later

 

[David Lowth]

Ok great stuff, thankyou. Yes good idea to check with him as he needs to sign it off.

I just realised i didnt mention the soil pipes on the diagram are coming in under the block and beam floor at present and simply capped off

 

[Harvest Fields]

Will draw something up later

I have no idea how you get the time mate.

 

[ShaunCorbs]

If there below can you put a 45 or 90 elbow on the left one ?

 

[Harvest Fields]

If there below can you put a 45 or 90 elbow on the left one ?

Or can you swap the basin and the bath around. Then move the toilet to where the soil pipe is? (Just brainstorming).

 

[ShaunCorbs]

as requested how i would do it

you can do this below but depends how much height you have / how far off the beams the 110mm is

 

[ShaunCorbs]

Or can you swap the basin and the bath around. Then move the toilet to where the soil pipe is? (Just brainstorming).

would say its a bit close to the basin then but unsure

 

[Harvest Fields]

would say its a bit close to the basin then but unsure

I thought that. But also thought I’d better say it😀

 

[Burger]

Building regulations document H might give you some pointers, it states maximum waste pipe runs etc. Free to download just google it and should come up with planning portal (gov) website

 

[David Lowth]

Thats fantastic. Thanks so much for your help.

Yes the soil pipe is on the floor and probably 20cms gap before the underside of the beams.

So could you either have the 50mm pipe effectively pouring into the grill on the gulley, or does it need to be bossed into the stack?

The left hand soil pipe could go through an internal 90* bend and then another 90* bend to bring it verticle up to the toilet, or does that sound like too many bends to you? There is a good 15- 20cm between top of soil pipe and bottom of beams as it stands.

Ideally under the floor is best for it all if i can. Loving what you have done above. Tomorrow afternoon i will see if i can replicate that under the block and beams, obviously ensuring it has the necessary runs etc to comply with regs, and just have verticle pipes running through holes in the block at bath, shower / basins etc.
And get some anti vac sink traps

 

[ShaunCorbs]

Correct but I normally hole saw the great

Depends on bc

 

[David Lowth]

Oh of course, hole sawing the grate gives a much better finish.

Going to be busy tomorrow afternoon then... the only issue i now forsee after your help is moving the left hand soil pipe with limited bends...

Only just fully clocked what you said i think. Yes..
I will see if like you said a 90 and then a 45 can be used to get it in the correct place without snaking the soil pipe uneccesarily all over the place using multiple 90s..

 

[David Lowth]

One final question if anyone knows..

The kitchen has been redesigned and the blue mains water pipe needes extending by about 3 meters. It has already been reduced to 22mm or possibly 15mm cant remember at the moment, but it has a brass stopcock on the end at present in one of these pipe sizes.

To extend it do i need to use a straight coupler on the blue pipe and extend it in same diameter blue pipe, or can i use the 15 or 22mm size pipe it currently is and extend the extra 3m in this 15 or 22mm pipe to the new stopcock location? If that makes sense?

How would you do this?

 

[ShaunCorbs]

If you need to move the stop tap use blue

If you just need to re arrange 22mm pipe and re do the stop tap eg new

 

[David Lowth]

At moment it pops out of a block under the sink and ends here with a brass stopcock on it, however it needs to end where the red dot is. If i connected under the floor as is in 22m pipe say, then would have to leave this stopcock open as it couldnt be accessed under screed etc.

Yes that doesnt sound right...

Ok ill find out what size the blue pipe is, and find a coupler that size to extend it. I assume you can get straight couplers for these mains water pipes

 

[ShaunCorbs]

Yea if it’s blue it will be either 20mm alk which I think yours is or 25mm alk