The new basement bathroom is framed and passed inspection. Ready to insulate and close. My first question is about the ceiling. We plan to use fiberglass batts between the joists in the ceiling. Above is a finished hardwood floor bedroom. In the framed walls we'll be using paper faced fiberglass, paper to the bathroom side.
I see different info on the ceiling. Looking for thoughts on whether there should be faced or unfaced fiberglass. Rockwool?
Thanks guys!
Best Answer
Consider if you need ceiling insulation at all. In a bathroom there's lot of extra moisture, and you don't want some to enter the space between floor and the fiberglass moisture barrier, and have trouble drying out.
Floor insulation helps with sound transmission a bit (though an STC rated ceiling is better). But in your case it might have more downsides than upsides.
This IS a good chance to insulated the joist bays from the outside, usually a weak place in standard home construction. Post photos. Research and remember some golden rules of insulation: seal air leaks first, never trap moisture between two vapor barriers, use the right insulation for your climate zone. Get a local expert, as climate matters a lot.