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Thread: Drain size for tub/shower combination

  1. #1
    DIY Junior Member
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    Default Drain size for tub/shower combination

    I am reading that the tub drain should be 1 1/2" while a shower drain should be 2". If a tub/shower combo is installed, can a standard tub drain be used, or does that require a larger shower drain?

  2. #2
    Plumbing Designer FloridaOrange's Avatar
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    What do you mean by tub/shower combo? Tub with a shower head? If so the 1-1/2" drain will work. The idea is that the tub can provide holding space for water if the drain is slow, a shower doesn't offer much if any holding before you overflow the curb.
    Matt
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  3. #3
    Homeowner geniescience's Avatar
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    The smaller size drain works.

    It also works for showers too, and that used to be the size required by "Code" too. I think that bigger houses and longer distances are the reasons why its size was increased to 2".
    Quote Originally Posted by FloridaOrange View Post
    .... idea ... holding space for water if the drain is slow, a shower doesn't offer much if any holding...

  4. #4
    Journeyman/Inspector Inspektor Ludwig's Avatar
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    Yes, you can have an 1 1/2 drain for tub/shower combo.

  5. #5
    Moderator & Master Plumber hj's Avatar
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    Default 1 1/2"

    You are too young to remember when a shower was permitted to have a 1 1/2" drain. I am also.

  6. #6
    Plumbing Designer FloridaOrange's Avatar
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    Quote Originally Posted by hj View Post
    You are too young to remember when a shower was permitted to have a 1 1/2" drain. I am also.
    Florida used to require all under slab plumbing to be minimum 2". Now they don't, along with allowing CVPC (with joints) underslab....
    Matt
    Semi-professional plumbing designer
    Enjoying life in SW Florida

  7. #7
    DIY Junior Member plumbergreg's Avatar
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    Quote Originally Posted by geniescience View Post
    The smaller size drain works.

    It also works for showers too, and that used to be the size required by "Code" too. I think that bigger houses and longer distances are the reasons why its size was increased to 2".
    The sizes in the code are the minimum size not the required size
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