Indoor pool

2509.2 exception #2 The code states that water resistant gyp. brd. shall not be used in areas subject to high humidity.

I am doing a review of a 6 story hotel with an indoor pool.

Is this indoor pool area a high humidy area? They are specifying water resistant gyp. brd and a tile wainscot about 5 feet high but the rest is exposed painted water resistant gyp. brd.
Original Post
i'll agree with Jon but go one further...
regardless of what anyone might tell you, if you have an indoor pool you'd better 'assume' for design purposes that every surface and component will be subject to continuous high humidity conditions (even if the circulation system is top notch and the circulating air is dehumidified)... that is the only way you will be able to protect the building against premature deterioration... there is no effective 'alternate' design approach for an indoor pool

the owner also has to understand going in that he has to plan/budget for the intensive, expensive, time-consuming maintenance procedures attached to the high humidity environment (over and above the regular pool maintenance process)... and that any failure to diligently follow those procedures will also send his capital dollars down the literal drain...

Just to tag on to what has already been said, you need to remember that pool water is corrosive, even in a vapor state during evaporation, due to the chemical used. This means exposed surfaces need to be treated or be of a material not affected by the chemicals.
Water-resistant gypsum board or 'green board' per Section 2509.2, is not allowed to be used behind tile "in tub and shower areas', where there is high water exposure, BUT green board is allowed behind tiles in water closet compartments where it does provide effective resistance for a less severe moisture condition.

Note that Section 2509.3, location 1, does allow green board behind approved water-resistant finishes other than tile in the walls and ceilings of shower and bathtub compartments PROVIDED there is no vapor retarder installed on the inside face of the green board.

The 2006 IBC Code/Commentary indicates that the installation of water-resistant membranes on both sides of the green board traps water inside the wall and causes the gypsum board to decompose and fail.

Further, per Section 2509.3, location 2, the IBC Code/Commentary indicates that green board is not allowed in areas where there are extreme moisture conditions with direct water exposure to water or high humidity, such as saunas, steam rooms, gang showers or indoor pools.
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