Hi all,

Had a plumber around to put in the sewer/drainage pipes for my new laundry extension. It will be double brick, with a slab floor. He has left me with a few questions on things that he assures me "will be fine" but I have my doubts. I wasn't sure if I should have this in the plumbing or structural thread, so hope I got the right one. BTW; all pipes are 100mm.

3 questions;

1; the pipes are on current ground level, with the finished floor level to be approx 400mm higher. He run the pipes across the ground, and then dropped vertically down into the trench I had dug for the footings. So when I pour the footings(450 wide by 600 deep), the pipe will be going right through the footing from top to bottom? Is this allowed/ should I let him away with it?

2; The pipe for the floor drain is set at such a level, that it will be recessed up into the bottom of the 150mm floor slab, thereby reducing the thickness of the slab to about 75mm. This will be most of the length of the slab, straight down the middle of the room. Therefore my slab will be only half the specified thickness in the middle of the room. He assures me "It'll be OK". This leaves me wondering why my structural engineer would specify a 150mm slab, when my "Not-So-Structurally" qualified plumber decides it only needs to be 75mm in the middle!! Is it time to get him back to lower the pipe to run below the slab?

3; I think I read somewhere that floor drain traps need to be 'refreshed' from the shower/sink/bath, to prevent the water from becoming stagnant. Is this correct? (Being 100mm pipe, I don't think I need to worry about it siphoning dry).

I have no desire to fall out with my plumber this early in the job, but he is starting to look fairly shonky. If he is, I DO desire to pull him into line this early in the job so he will be less inclined to keep doing shonky work.

Appreciate any advice you guys can give me here.

Assistance much appreciated.

BraveorFoolish?


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