Waste pipe from bath/sink goes slighly uphill? New install

[gcltd]

Hi,

I've had a bathroom installed and the waste from the bath/sink runs along the wall and in to the waste pipe.
The run from the bath to the waste pipe is around 4-5ft but as it get closer to the waste pipe, I can see that the pipe goes slighly uphill then it connects to the waste so the whole run isnt at a downward gradiant - plus the gradiant it does have is very slight.

Plumber advised this isn't a problem but I'm not sure.

Is this a problem or will this cause me a problem in the near future?

Any advise is appreciated.

Thanks

 

[Bosswhite]

It all depends on what you consider is a "very slight gradient"

18mm fall for every metre run is recommended to stop water (and muck) collecting in waste pipe.

 

[Tibbot]

To me, waste running uphill is unacceptable.

 

[RigidRaider]

Absolutely hopeless, shower water will lie in the pipe, which will soon block with hair and scum. You need a good clean fall from shower to soil stack to get everything out. See my post on the other thread here about low-level shower trays.

 

[gcltd]

Hi,

Thanks for replying, I'll measure the total drop.

I suggested he raised the bath to give it a drop but insists he cant see a problem?

I'll check out the total drop based on the 18mm posting and get him to sort it out.

Thanks