waste pipe for shower tray

[Phil1979]

Hi
started replacing a old shower in my en suite prepared the area and was about to start building the plinth when I thought I should check the waste pipe.

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• Phil1979
• 19 Jul 2013
• 1

now my problem is the waste pipe has no drop in it at all and emptys slowly when I pour water down it,it runs under the floor and im guessing joins to the waste running down from the sink the waste pipe also sags slightly in the middle.

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• Phil1979
• 19 Jul 2013
• 1

The waste pipe also doesn't drain completely and when I use a tap in the sink the waterlevel raises and drops a little.

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• Phil1979
• 19 Jul 2013
• 1

Do I need to replace this waste pipe if so any advice and as much detail as possible on what I need to do would be greatly appreciated
Thank you
Phil [/img]

 

[Charnwood]

If it were me I'd be running the shower waste pipe in 40 or even 50mm, getting rid of the sag and, if possible, introducing a fall. Beyond where the basin and shower waste pipes join I'd definitely be using 50mm.

I'd possibly consider a non-return valve on the shower waste pipe unless a decent fall can be introduced.