My new walk in shower draining slowly but not all the time. Is it an airlock?

[Caz]

Ask the "builder" if he fitted one of these.

It is poor practice to tee basin/shower wastes together as it can result in basin waste entering the shower - to combat this "builders" often fit these one way valves - causing the problem you are experiencing.

I have spoken to the plumber the builder used on the job. He said he’s confident the 90 degree turn and the T junction do not affect the flow. The drainage pipes from the shower are 1.5 inches in diameter. Maybe our best bet is to get a camera down there ....

 

[Riley]

Must be at their cost. You won’t have blocked it in that time

 

[rpm]

IF the op was to put plugs in basin(s) and tape over the overflows and then finds the shower doesn`t drain would that help pin point the problem area?
(Just asking).

 

[Mrb]

I’m like a broken record but builders build plumbers plumb I wish people would start taking note

But I’m a plumber but I can also paint, walls that is not like Mozart, what’s that about?

 

[Riley]

But painting shouldn’t cause any detrimental affect to a system if you don’t have a clue. It will just look crap

 

[SimonG]

Riley's in the house