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Happy New Year everyone!. After moving the tub to FL, new heater, rebuilding motor and fixing a leak, we're up and running. Regarding the leak, we had to pull most of the soaked insulation out the back and some of the sides. Now we have to reinsulate and after using a couple cans of great stuff spray foam, it hasn't made a dent in filling the void. It kind of settles on it's self. Can we put nonfaced insulation to take up some of the room and then use the spray foam to fill in? Any suggestions greatly appreciated.
If you have an air blower that produces bubbles, or even air venturri's that suck air into the jet stream, you will be injecting small bits of fiberlass fibers. I don't think it is a very good idea. You should be looking for expanding foam insulation. A and B chemicals mix during application and expand, similar to the what you used, but you will need 100 to 200 board feet.