OK for waste to run uphill a short distance?

[trf0412]

Yes, that helps a lot - thanks!

Such a simple, elegant solution and one which easily allows the fall on the basin waste to be independent of the fall on the shower waste. (Now I've seen the suggested fix, I'm amazed why he didn't simply do this in the first place?!). However, this will only work if the pipe going across the joists doesn't start so high up as to rule out getting enough fall from the basin... if it does, then I'm not sure what we'll do.

So, in this set-up, would it be right to use the same tee that he already used (i.e. one that would direct the flow from the shower down to the right)?

 

[ShaunCorbs]

Makes me think he's not a plumber anyone can put pushfit pipe together And glue waste pipe

Doing it correctly is another matter

Should be more than enough might need to slot the joist the basin end but other than that should have a good fall on it

No as you can't unglue the fittings

 

[trf0412]

Makes me think he's not a plumber anyone can put pushfit pipe together And glue waste pipe

Hmm, maybe I should just take up floor and do it myself!

might need to slot the joist the basin end

Yes, I thought that might be necessary.

No as you can't unglue the fittings

Hehe! Sorry, I didn't mean reusing the exact same one, I just meant the same design.

 

[Chuck]

Hmm... I can try, but I know it'll be an awkward conversation. I already asked him whether he thought the lack of a fall would pose a problem and he basically said "it's fine how I've done it, just trust me please".

Tell your plumber that you have had your attention drawn to some defects that need rectifying. Make it clear that either he fixes it, and to a proper standard, or you will get another company who does understand what plumbing installed 'with reasonable skill and care' (use exactly those words) means.

Your only decision, which largely depends on how much you value your own time, is whether to try and get the person who installed the mess in the photographs to fix it or cut your losses and get someone else to do it again right.

I'm old enough to have learned you can't get blood out of a stone. In your circumstances I would write off any sunk costs to experience and get a reputable trader to redo the work to a more appropriate standard.

 

[ShaunCorbs]

Also you will need an anti vac trap on the basin

I wouldn't do it my self either plumber does it or he doesn't get paid for the waste pipe simple and if he choose not to change the design of it by by get another plumber in

 

[trf0412]

So, Chuck votes I sack him, Shaun votes I give him a chance to put things right. So far it's a tie!

I'll see how responsive he is to the idea of rectifying things and then guess I'll go from there, as generally speaking he has been quite willing to listen and do what I've asked. Having said that, I should point out that one of the things I asked him to do was reinforce the joists where he was cutting holes - if I hadn't asked him to he wouldn't have done that, so perhaps that's not a good sign either?

Another issue I have is where the pipes clash with the shower trap... instead of re-running the pipes to avoid this, which may have needed another small notch, he chose instead to cut out one massive notch! As it's now covered I can see how deep it goes, but I'd guess from the photo it's easily 50% of the joist height!

 

[ShaunCorbs]

Yep not good upto you tbh do you still trust him if you don't by bt there's the door if you do see if he will listen to your concerns

 

[Ric2013]

Look up the rules on joist notching and drilling. 50%! I'm going to stick my neck out and say you can push the boundaries a bit, as the joists could well be over-engineered in the first place (and sometimes there's no choice), but a notch should be 1/8 of the joist height maximum...

Shared waste:

Let's assume shared section is only used by one appliance at the time as you don't tend to shower while using basin. So it's okayish that both wastes can't flow properly at the same time. Most likely problems are that washbasin draining will throw a slug of water down which might cause pressure at the shower waste, pushing the foul air (and some water possibly) into the shower tray, particularly if the shared section is in any way restictive. Or one appliance could suck the water out of the trap on the other and foul air will enter the bathroom. Or, weirdly, both could happen.

 

[trf0412]

Look up the rules on joist notching and drilling. 50%! I'm going to stick my neck out and say you can push the boundaries a bit, as the joists could well be over-engineered in the first place (and sometimes there's no choice), but a notch should be 1/8 of the joist height maximum...

Yep, I've seen them which is why (i) I was so shocked to see what he's done and (ii) I insisted on him reinforcing the holes (no idea how much it will help, but it will certainly be better than nothing).

Shared waste:

Let's assume shared section is only used by one appliance at the time as you don't tend to shower while using basin. So it's okayish that both wastes can't flow properly at the same time. Most likely problems are that washbasin draining will throw a slug of water down which might cause pressure at the shower waste, pushing the foul air (and some water possibly) into the shower tray, particularly if the shared section is in any way restictive. Or one appliance could suck the water out of the trap on the other and foul air will enter the bathroom. Or, weirdly, both could happen.

Thanks for this explanation. Very helpful. So, in an ideal world, should each appliance have its own waste which runs all the way to the soil pipe? Or is it ok for them to join up further downstream?

 

[Guitarjon]

Cricky, I was going to write a long winded post about how many things look wrong with those pictures but it's been covered and not fair to bang on about it, especially as it's not the poster doing the work. Certainly no plumber with actually knowledge on regs or qualifications has done any of that. If it is somebody with conpentancy they need reporting and pecious work checking out.