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Question:

What type of insulation do I use in the bathroom ceiling?

I'm remodeling a bathroom, and I need to know the best insulation for sound/moisture? Also should I use the regular drywall or the green one on the ceiling?

Answer:

You can try egg shell foam or insulation rated for noise control. There are bathroom vents that are remotely located. The motor is located in the attic, Sorry, can't remember the name.
i have a drop ceiling in my bathroom and use fiberglass plastic coated tiles that give some insulation, are waterproof on the plastic surface and can be (have done this several time) painted after 4/5 years if you so desire or just put new ones in front of the old ones and now the insulation value has doubled. you can keep doing that till they're 3 deep. you can buy them and the tracks that they fit in at home depot. a small bathroom would be less than $100.00 to do. you need to keep in mind when doing those ceilings, always find the MIDDLE of the two connecting walls then measure 12 inches on both sides from the middle. that's where you put the runners. NOT IN THE MIDDLE. now the room is divided equally from the two middles. if you don't then one side will be larger than the other. it may not make sense to you, but believe me it's true. there's not a room in my house that i don't have this system. if you ever get a water leak you just clean up the tile or replace it. use a 2x2 system not a 2 x 4. all the tile comes 2 x 4 (actually a little less) find the exact middle and then cut them in half. not a days work involved. putting up the track is more than 1/2 the job. it must be level all the way around and from side to side some of my ceilings i actually have rolled r-19 insulation on top of those tiles. remember armstrong esprite plastic coated tiles NOT CARDBOARD once the cardboard gets wet it needs to be replaced. i'm not sure but i believe i've had this system in the bathroom for about 20 years now, and other parts of the house for over 30 years, you can paint them or buy new ones and replace them. sometimes that's the wiser thing to do. hope that helps you. greenwall is always better for the bathroom.
On new houses, they insulate the ceilings with fiberglass batts, and use regular drywall on the ceilings. When I remodeled our bath, I used green board everywhere and I tiled the ceiling of the shower. A lot of work, but worth it.

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