Access to tub faucet - size of hole in drywall?

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by AcidWater, Nov 7, 2012.

  1. AcidWater

    AcidWater New Member

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    How big a hole do I need to cut behind the tub faucet to replace it? Want plenty of working room.

    The valves are 24" above the floor, the spout about 19". 3 valve type with 8" spacing.

    the big question is: How much above & below that should I allow to get to the unions, if present? I want to cut a single piece of drywall out so I can replace it easily.

    Its in a closet so I can go large... stud indicator says there's a stud in the middle.
  2. MACPLUMB 777

    MACPLUMB 777 TROJAN WORLDWIDE SALES RP

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    Houston, Texas, United States
    Go stud to stud on the two outside studs that always does it for me
  3. hj

    hj Moderator & Master Plumber Staff Member

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    Getting to the unions is not the problem because they are right below the hot and cold stems. Piping to the new valve is where you may have problems. If you go below the tub spout, 6" above the hot and cold handles, and stud to stud, you should be fine.
  4. AcidWater

    AcidWater New Member

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    Okey Dokey. Hopefully the replacement will fit the existing unions.
  5. johnjh2o1

    johnjh2o1 Plumbing Contractor for 49 years

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    That's not going to happen. Most new three valves, if you can find one no longer have unions. Even if they did they wouldn't fit the old ones.

    John
  6. hj

    hj Moderator & Master Plumber Staff Member

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    26,691
    Location:
    Cave Creek, Arizona
    They MIGHT fit if the new faucet is the same make as the old one, but even then they sometimes change the patterns to make them "lighter", (i.e., cheaper).
  7. AcidWater

    AcidWater New Member

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    How do union joints differ? Are they brand proprietary?

    Gotta cut the hole in the wall today...
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