Low height bath trap?

[Justice League]

Having a new bathroom fitted and the old bath. It's a terraced house with a single story kitchen to the back. The bath waste pipe runs through the roof of the kitchen and then out to the side. There is no access from the kitchen into the roof area above.

The floor of the bathroom is about 5cm below the top of the kitchen roof where it meets the house wall. The toilet and wash basin both exit the wall and run along the top of the kitchen roof next to the wall and then to the gutter.

The bathroom fitter has suggested we raise the bath by 10cm so that would give enough clearance to run the pipe out of the wall and run it above the kitchen roof.

Would a low height bath trap work?

 

[oz-plumber]

A low height bath trap may save you raising the bath by 10cm - but not by much.
Maybe 5cm.

I would be more concerned about the height of the bath and getting into it.
Is the bath fitter going to install a step for access?
Is there not a regulation on the height of the bath above floor level?

I would tell the bathroom fitter to keep the bath at the same level and work out how to get the waste out.
They obviously quoted the job and would have made allowances for discrepancies.

His suggestion is to make his life simple at your expense / grievance at a later date

 

[snowhead]

I think I prefer to have to cut a hole and patch the kitchen ceiling rather than be stuck with a bath that's too high.

 

[Ben-gee]

Why can’t you reuse the existing pipe?

 

[Justice League]

Here are pics of the inside of the bathroom and the outside. You can see the original lead bathroom waste pipe that goes out through the kitchen roof.

 

[king of pipes]

Better to drop through the flooring either into the kitchen ceiling void below or maybe through it and run the bath waste on the surface out the wall connecting into the soil pipe via a strap on boss and box it in ? I would not raise the bath any higher than the bath panel allows. Kop

 

[oz-plumber]

I think the pipe you are referring to in the pic is an old basin waste.
Hope that is being replaced

 

[Justice League]

I have added some notes. I will measure the height from the bottom of the toilet soil pipe to the floor.

[automerge]1598695213[/automerge]
The old bath waste pipe is some thick lead pipe. The fitter suggested to use a solder fitting onto that as its still in situ. But I was thinking its better not to use that?

 

[oz-plumber]

You're paying to have a bathroom refitted.
Why would the bathroom installer contemplate using 50+ year old waste pipes.

I personally would not contemplate using any of the existing if it wasn't PVC.
I would also renew the hot and cold water in the area of the bathroom.

 

[Justice League]

You're paying to have a bathroom refitted.
Why would the bathroom installer contemplate using 50+ year old waste pipes.

I personally would not contemplate using any of the existing if it wasn't PVC.
I would also renew the hot and cold water in the area of the bathroom.

The cold and hot pipes seem to run from 15mm to 22? and then back to 15mm when they reach the bathroom. Not sure why that is.

I really don't want to take the ceiling of the kitchen down as the kitchen is fairly new.

 

[Ben-gee]

In that case drop the bath waste down through the ceiling of the kitchen and then run it to where it needs to go in a boxing just below the ceiling. Or if it is convenient, run it just above the kitchen cupboards - with a small upstand to conceal it.
None of this is that unusual to do , admittedly it is more common when replacing a bath with a low level tray or a wetroom, but the principle is the same.
Surely your bathroom fitter has come across a similar situation before?

 

[Justice League]

In that case drop the bath waste down through the ceiling of the kitchen and then run it to where it needs to go in a boxing just below the ceiling. Or if it is convenient, run it just above the kitchen cupboards - with a small upstand to conceal it.
None of this is that unusual to do , admittedly it is more common when replacing a bath with a low level tray or a wetroom, but the principle is the same.
Surely your bathroom fitter has come across a similar situation before?

I gave the whole house project to a builder / PM who brings in his own tradesman - saves me the time and hassle of managing it all. However it seems that the bathroom fitter seems to want to do everything rushed - I don't know why as I need to discuss this with the builder who I need to meet next week to resolve a few issues.

I believe that when the builder took on the project he just assumed it was an easy connection to the existing waste but the fitter now possibly has to work within a requirement that is not appropriate?

It's why I was looking for advice as I really don't want a botched job.

 

[Ben-gee]

If it was all hidden away and therefore unseen, you should tell them you want it doing as we’ve described and that you realise an extra cost is involved- which you should then agree a ballpark figure on.
If the builder has agreed a price to the bathroom guy and it turns out more complicated than foreseen there is no reason why he should swallow the cost.

 

[Justice League]

The clearance under the bath is a minium 10cm and could possible be more if I can raise the feet on the bath by one inch. But would that give me enough height to fit a bath waste and trap where the outlet pipe was no lower than the floor.

The run from the bath waste through the wall is about 50cm.

 

[king of pipes]

You must be well above the lead flashing ?? It looks pretty close to me , one of these traps will give you a bit more clearence a small pilot hole will tell ?? You could measure down from the existing pipes as a guide ?? . Kop

 

[oz-plumber]

Is there not a void under the tiles?

Can you not run the waste in the void and connect directly to the stack?

Does the builders quote state ' Connecting to existing waste pipes' If not, then they have to make the installation work.

Some of the things they are expecting you to wear will be to your detriment and your expense at a leter time when things go wrong.
Connecting to lead wastes will be one of them

 

[Justice League]

You must be well above the lead flashing ?? It looks pretty close to me , one of these traps will give you a bit more clearence a small pilot hole will tell ?? You could measure down from the existing pipes as a guide ?? . Kop

Yes the floor of the bathroom is above the flashing. The toilet waste pipe exits above the flashing as well.

https://www.NoLinkingToThis/p/mcalp...mm/21158#product_additional_details_container

Has anyone experience of Mcalpine combined bath trap and clicker waste?

[automerge]1598952500[/automerge]

Is there not a void under the tiles?

There is a void under the tiles but the kitchen ceiling has no access - to push the pipe through the void would mean ripping the recently plastered kitchen ceiling.

 

[oz-plumber]

Yes the floor of the bathroom is above the flashing. The toilet waste pipe exits above the flashing as well.

There is a void under the tiles but the kitchen ceiling has no access - to push the pipe through the void would mean ripping the recently plastered kitchen ceiling.

Can you not lift the roof tiles to gain access to the void?