Indoor hot tub

Discussion in 'Remodel Forum & Blog' started by Mrs.Jelinek, May 16, 2009.

  1. Mrs.Jelinek

    Mrs.Jelinek New Member

    May 16, 2009
    Hello building a structure for my hot tub to be indoor and I am having a problem. I need to know what I can use for the walls and ceiling for the hot tub room so it don’t get mold and will last. I don’t want to use cedar because it is very expensive and I’m on a budget. Can anyone help me out?
  2. jimbo

    jimbo Plumber

    Aug 31, 2004
    San Diego, CA
    If you are on a budget, forget the hot tub. Do it right or not at all.

    Mold is caused by moisture. The secret to avoiding mold is LOTS of ventilation. Other than cedar or teak, or ceramic tile, the only material left for the walls is FRP ( plastic panels like you see in public washrooms)
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  4. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona

    Why does everyone want to find some way to cut corners because they cannot afford to do the job correctly to start with. But then later somehow find the money to redo it correctly when the cheap job fails, and it costs extra because he has to take the old stuff apart first?
  5. Mrs.Jelinek

    Mrs.Jelinek New Member

    May 16, 2009
    it not that im not going to finish it i just need some ideas on what to use indoor for the hot tub. beside cedar...
  6. Mrs.Jelinek

    Mrs.Jelinek New Member

    May 16, 2009
    ok i never herd of teak. but i do want to finish it and i have a large room to do so cedar is out if the question. so i just wanted to know what else i can use for the space and i do have a lot of ventilation. from the top of the celing and im going to put a vent fan in as well

  7. Terry

    Terry Administrator Staff Member

    Aug 17, 2004
    Bothell, Washington
    Here is my experience with hot tubs or swimming pools indoors.

    I rented one home with a sunroom and hot tub.
    We had to keep the cover on it constantly to keep the moisture from dripping off the glass and wood structure.
    The repairs to the wood framing were a few thousand dollars.

    We looked at another indoor hot tub rental,
    it was downstairs in the basement, the whole house smelled of chlorine.

    Most hot tub rooms will have water dripping from the ceiling.
    To keep the air dry, you need an air to air heat exchanger.
    Otherwise, the cold air coming will condense the water vapor.

    Street of Dreams home near Bear Creek.
    This one had a swimming pool.
    The drywall kept falling off the ceiling.
    The contractor tried several ventilation systems,
    Problem was never solved as far as I know.

    Customer with indoor hot tub,
    This couple had a baseball field in their back yard in the city.
    That's how big their lot was. I thought it was a city park.
    They got so tired of fixing the house, that they sold it and moved to Pullman.

    Hot tubs are big water vapor producers.

    Have you ever swam at a public pool, and it feels like rain inside?
    That's all the moisture from the air, hitting the cooler ceiling and condensing into water.
    I can't think of too many public pools that still have wood structures over them anymore.

    Best method?
    Figure out how to remove the moisture.

    A roof seems fine, I'm not so hot on the "closing it in" part.

    When I go to Whistler Blackcomb and stay at the Crystal Inn, I use their outdoor swimming pool and hot tub.
    The temperature is below freezing, and it feels fine.

    The swimming pool and hot tub are on the left, on the first floor roof.
    Yes, that's snow on the ground too. It snowed every night.
    Last edited: May 17, 2009
  8. Scuba_Dave

    Scuba_Dave Extreme DIY Homeowner

    Jan 5, 2009
    Used to be in IT
    South of Boston, MA
    Both of my hot tubs at both houses have been outdoors
    My current house the tub is tucked into a corner
    Sunroom on one side, house on the back, greenhouse blocks wind on a 3rd side. Lattice on the greenhouse side gives privacy
    IMOP - don't do it, but if you do:
    The entire room would need to be cement board with vapor barrier to keep moisture in the room. Use tile or the plastic FRP sheets as suggested EVERYWHERE
    You will need an exhaust fan (heat exchanger a great idea) to vent the moist air outside. Best bet is to close this room off with doors from the rest of the house. Installation in a basement is a no go due to the fact they are usually damp to begin with. Be prepared to spend a lot of electric to heat the tub. And expect your heating bill to increase in the winter when you need to vent moist air outside. If you are in an area that is humid & you use AC expect the AC to work harder (?) to pull moisture out of the air. In addition a dehumidifier or two would be a needed additionto keep humidty levels down

    We have a "swing" umbrella that we can swing over out hot tub if it is raining, other then that I like to see the sky & stars. We were out in single digits weather in the hot tub for 5 hours. Alternating between in the tub, sitting on the edge, running for more beers, or going to the bathroom :D
    To me, the best part of a hot tub is being outside, especially in the winter

    There is no inexpensive solution to installing a tub inside to do it right
  9. Gary Swart

    Gary Swart In the Trades

    Sep 1, 2004
    Yakima WA
    If you can't afford cedar, then don't even look at teak. I think an indoor hot tub is a foolish idea for all of the reasons others have noted. If you can't afford to do the job right, don't do it at all. because the corners you cut will come back to haunt you later. If you go ahead with this project, I predicate within 3 years you will either just drain and discontinue using the tub, or you will remove it entirely.
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