Hello,

I am consulting on an addition to house an indoor swim spa or endless pool. I am getting all kinds of feedback from the different insulation companies about what type of insulation to use. I don't want to recommend something that might be prone to rot in the future, however the spa company has no real guidelines in this area. Their only suggestion is to install a bath fan in the room. If the drywall is sealed with bathroom paint and the drywall is caulked impeccably, is moisture in the insulation cavity even an issue?
I can find no one for whom excessive moisture with one of these things has been an issue. Is blown in cellulose an option here? I hate batt insulation because getting a good install is so difficult. Anyone with some insight would be greatly appreciated.