On all the TV shows they say that shower drains should be 2", while all existing shower and bathtub drains are 1 1/2". The Plumbing Code states that for up to 2 fixtures that 1 1/2" is all that is required. Who is correct, the TV shows, or the code.
Do I have to change my drain size to 2" or is 1 1/2" allowed?
Also the Shower Drain Plate fitting is 2". Can I use a reducer to connect to 1 1/2" pipe if I don't have to change to 2" drain line?
Thanks in advance, I need my shower back.
Code isn't always the best guide as it usually means the "minimum" requirement.
Yes, 2" should be used for a much better flow. You can reduce it down to 1 1/2" if it's your only option, but I recommend using 2" all the way for much better performance. It's much easier to do it properly now while you have you apart.
Remember codes change all the time. So depending how old your house is, you might have a 1 1/2" drain. However all shower drains are now 2" as you know from your drain plate. If you can replace your drain pipe to 2" all the way to the stack, that would be best. If it's not possible, you can reduce the pipe size, but do it only on the vertical section of pipe. If you reduce the horizontal portion, your creating a clogg point.
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