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 New Bathroom Shower Remodel Advice Needed
Author: solman (NY)


We are doing a total new bathroom remodel. When I went to the job site I noticed that the 2 PVC lines on the floor running up to the shower valve wall were different sizes? As I understand, all shower valves use 1/2 connections for Hot and Cold so shouldn’t both water lines also be the same 1/2 inch size? The Hot was smaller that the cold pipe.

I questioned the Contractor and his answer was that the Hot water is always a smaller size than the cold ?

Sounds rather strange to me but appreciate a Plumber’s answer.

Thank you guys.

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 Re: New Bathroom Shower Remodel Advice Needed
Author: packy (MA)

just to clarify...
PVC water lines are illegal inside the house.
CPVC are legal

as for size..

if your house has adequate pressure/volume and the shower is not a multi-function type controlling body sprays and /or other functions then 1/2 inch is OK.

so you can't just make a blanket statement about sizing because it all depends on the final product.

BTW.. shower valves are not all 1/2 inch. there are many 3/4 on the market.

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