From entering the backing, however I did want something a bit more durable than green board if the unthinkable would occur. With regards to the ceiling, I chose green board for functionality and installation. The green board is coated in joint compound and covered with a two part epoxy sold by PPG. The epoxy is used in very humid applications like indoor pools, spas and saunas. I believe it will hold up fine over the years and give the room a less industrial look. The two shots below highlight the finishing on the OSB insulation and the beginning of the ceiling with green board which turned out to be a more complex job than anticipated and took two people.

Holding the board up at a height of fourteen feet was difficult, but not as difficult of working with the skewed angles formed by the room. The left hand wall runs perpendicular to the back of the house, but the right hand wall contains two angles which made the roof installation a nightmare. Instead of being able to run the right wall parallel to the left I had to taper it inward to follow the property line. A new zoning restriction was passed years prior to the windows being cut (see the prior page for window being cut).

Since I have shot these photos, the ceiling has been completely dry walled, covered with joint compound and I am ready for the FRP installation and the finishing touches on the room. I believe I will do the floor and three courses of block on the right with ceramic tile, which is a bit more appealing then the cement pad, but I'm sure a bit more slippery. This final shot shows one of the three skylights. The pane is pure glass allowing all the UV rays to enter the facility. I plan to install light tubes between the skylights to direct light to specific vessels of water.