Shower waste fall advice

[Oscart]

Help guys, on with the waste first fix and going to sol weld everything, clean up existing etc and go from there. The lhs boss I am going to use for a bath but I need two showers to go into the one facing us. Can I do this? Do I need to add any anti siphon bits in? Also shower 1 is only a 80cm run away so scared my fall will be too steep… any advice welcome

 

[ShaunCorbs]

I would use 2” upto the first tee off eg for both showers

And at the end I would run a 11/4 to somewhere accessible and Install an aav just incase

As for the fall as it’s just water you will be fine but you can always use a 45 etc to lessen the fall

 

[Ben-gee]

I would use those two for the two showers and add another boss above the floor for the bath, unless the bath waste needs to be below the floor- eg freestanding.

 

[Oscart]

I would use 2” upto the first tee off eg for both showers

And at the end I would run a 11/4 to somewhere accessible and Install an aav just incase

As for the fall as it’s just water you will be fine but you can always use a 45 etc to lessen the fall

Thanks Shaun

The two showers will come 1 from left and 1 from the right, so I’ll do a butt of 2” out the stack then can I get a double swept tee? To take it right and left from there

 

[ShaunCorbs]

2 inch - 50mm Solvent Weld Swept Cross Tee

2 inch - 50mm Solvent Weld Swept Cross Tee A solvent weld cross tee with three sockets and one spigot for 2 inch ABS / PVC waste pipe and available

www.plumbers-mate-sales.co.uk

 

[Oscart]

I would use those two for the two showers and add another boss above the floor for the bath, unless the bath waste needs to be below the floor- eg freestanding.

Yes the bath requires under floor waste as freestanding

 

[Oscart]

Thanks Shaun. Just the ticket! And just tee off a 11/4 aav on one of the incoming shower wastes?

 

[ShaunCorbs]

Or take it off the pass through / straight through connection

 

[Oscart]

I have just calculated and I don’t have enough room between the soil pipe and joist for a 2 inch fitting, I have resorted to a 1 1/2 swept tee with the two showers coming into it. Where the two showers converge it’s right next to the stack… will this be ok?

 

[ShaunCorbs]

You can’t use a tee like that as the swept is wrong have to use two separate tees

 

[Oscart]

You can’t use a tee like that as the swept is wrong have to use two separate tees

Sorry Shaun, I was going to use the swept tee to come from one side then in the end of the tee come in through the joist with a male - female 90 deg connector to come from the other direction if you get me?

 

[ShaunCorbs]

That’s fine in that way was imagining using either side for drainage then out to the stack via the swept

 

[Oscart]

That’s fine in that way was imagining using either side for drainage then out to the stack via the swept

Ah nooo I know what you mean though I was just concerned the two showers where going into the 1 1/2 tee not the 2” we discussed previously… also I am just installing 1 aav as close to the stack as possible for the two showers?

 

[ShaunCorbs]

It’s one of them if you can’t install 2” 11/2 will have to do

As for aav needs to be on the end of the run eg after last shower or tee etc

 

[Oscart]

It’s one of them if you can’t install 2” 11/2 will have to do

As for aav needs to be on the end of the run eg after last shower or tee etc

Hmm yeah I might be worrying about nothing? I do have the other boss which is for a bath I could use a swept 2” tee on that at the stack and take 1 bath and 1 shower into that? Leaving the lower boss for 1 shower only

Ok so the aav as close to the stack as possible then?