Indoor Heated Pool - Condensation/ Corrosion Issues

mike1234_2006August 16, 2006

I am constructing a heated indoor lap pool. The water will be heated, but I'd like to avoid having to actively heat/ dehumidify the atmosphere in the enclosure. Dimensions are 55 feet X 8 feet X 5 feet deep. The walls will be mainly glass (North and South walls - along length) and Stone (East and West - at ends of pool).

I'd like to survey opinions and experience out there:

1. Will opening 4 doors (approx 6 feet wide) along the glass walls for a short period allow enough ventilation, after 2-3 hours use, to eliminate moisture and minimize condensation on walls and ceiling?

2. Will using a good quality pool cover, when the pool is not in use, reduce the evaporation rate sufficiently to eliminate the risk of chlorine/ corrosion damage to the aluminium framed windows and other structural elements of the building?

3. Can people suggest materials for the ceiling - obviously the main location of condensation. Will painted moisture resistant drywall board be sufficient (assuming ventilation as proposed above) or is there some other specialised material?

4. Would it be folly to assume the ceiling, if sealed conventionally, can prevent roof structural components above the ceiling to be protected from damp/chlorine. If not, would timber or galvanized steel be more appropriate?

Thanks all.


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    Bookmark   January 11, 2007 at 1:24PM
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In my experience you cannot have an indoor pool without dehumidifying/heating the space, I do not know what the weather in your area is like but I doubt you will be happy swimming in a rain forest where you cannot see across the pool through the fog.
to your points:
1. Unless the outdoor air temperature is at least 1* higher than your water temp opening your doors will make the condensation/moisture etc WORSE!
2.A cover will help keep condensation down and will lower the cost of heating/dehumidifying. Properly maintaining chemical balance will reduce corrosion to window frames etc.
3.If you are going to attempt to have an indoor pool without addressing the condensation problem please build your ceiling of cedar but be prepared for your deck to be stained from the water dripping from the ceiling.
4. Yes, it would be folly. I have personally seen 5 ceilings fall into indoor pools in my 18 years in the business.(none of which I built, thankfully)
Do yourself a favour and put in a dry-a-tron or similar unit.

    Bookmark   January 11, 2007 at 6:02PM
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Mike, would you (or anyone else) be able to give an update on what you came up with for your indoor pool?
We are building an indoor pool, and I know we should have had this all figured out before we started, and are wondering the best way to control the humidity. We live in the north and would only get 3 months at the most if we had not decided to go for an indoor pool.
Any suggestions from anyone would be appreciated.
Thanks, Jeanie

    Bookmark   July 19, 2007 at 5:20PM
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We looked EXTENSIVELY into an indoor pool while in the planning stages of our house.

Our home builder wouldn't even construct the area that we wanted to put the pool in. He wouldn't touch anything to do with the pool with a 10 foot pole because of humidity/corrosion issues. He didn't even want to warranty the room that he was building that *connected* with the pool area.

Being in Michigan with such a short season, this is something we really thought we wanted. So, we started getting bids from contractors to build an addition onto our new home. Then bids from pool builders to build a 24x16 indoor pool.

The brakes went on pretty fast when the lowest quote we got for the de-humidifying system ALONE was $65K. The unit, in an of itself was expensive but it was all the duct work and the blowers installed in front of all the windows to keep them from becoming fogged up and rotting was major, too. Then, nobody guarantees nothing. So we gave it up.

If I had an extra $500K to it up right: de-humidifier, cedar ceiling, top of the line windows/skylights/fans and then furniture that wouldn't mold/rot, I'd do it in a minute. It would be a dream come true.

Good luck!

    Bookmark   July 19, 2007 at 7:41PM
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of items I'd need to do it right: an automatic pool cover.

And a fireplace. Not because it would help with the de-humidifying process. But because I can't think of anything better than floating in an indoor pool next to a flickering fireplace while the snow falls outside on the pines. Sigh.

    Bookmark   July 19, 2007 at 7:50PM
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Hi Mike
Check out rollacovers at They are in CT and I am considering getting one. Depending on where your pool will be, they can use one wall of your building as a wall to attach the rollacover. They also make freestanding ones...
Good luck!

    Bookmark   July 20, 2007 at 11:53PM
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Looks like we might have "jumped the gun" on building an indoor pool - sounds like the expense of dehumidifying it might be very high.
Any other information from anyone would be appreciated, also.
Do any of you know if there is a forum online anywhere that is especially for indoor pools.
Thanks, Jeanie

    Bookmark   July 21, 2007 at 1:24PM
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You can find application notes from Desert Aire's web site. Look for AN10.

    Bookmark   February 20, 2011 at 11:15AM
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I work for a company in Australia offering pool de-humidification units for as little as $5000 Aus.

For Mikes pool it would be approx $30,000 Aus

    Bookmark   April 28, 2011 at 12:03AM
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