35mm Copper Waste for Bath - Connection Help/Advice?

[1TT1]

I am in the middle of fitting a new bathroom. The current waste pipe for the bath is 35mm copper, which I know is below the minimum requirement of 40mm for building requirements. The house is really old and was built in the 60’s and hasn’t been touched since so the current system has worked up until now.

Without taking the current waste pipe out and reinstating new pipe work, and with bath wastes nowadays being 1 1/2 is there any way around making this connection?

Would reducing from a 1 1/2 waste down to 1 1/4 to then make a connection with my 35mm waste pipe be that bad? I know reducing waste pipe is not ideal but I don’t know what else I can do?

Any help here would be absolutely brilliant and thanks in advance

 

[terryplumb]

Fit a compression reducing coupler between the two pipes.

 

[1TT1]

Fit a compression reducing coupler between the two pipes.

Thanks for the reply terry!

So would this reduction cope okay with the amount of flow coming from a 1 1/2 bath waste? Just wanting to make sure before I buy my parts. Cheers

 

[terryplumb]

The coupler won't alter the flow thru your existing waste pipe. Even if it did ,would it bother you if it took a few minutes longer to empty the bath !

 

[Hugh Jaleak]

Reducing a bath waste isn't too major a deal in the grand scheme of things. The main problem arises with washing machines etc, where the waste is pumped out, and if the pipework cannot handle the flow, it gets messy.