I'm remodeling a bathroom on the upper level of our house and have a couple of questions about attic insulation as it relates to (a) humidity from the bathroom and (b) the rain shower head pipe that will be installed in the attic such that the shower head protrudes from the bathroom ceiling.
I pulled the old drywall and cleaned out the old cellulose insulation that didn't fall when I dropped the ceiling and when done, I'll put greenboard up on the ceiling. I don't want the shower head piping in the attic to freeze in winter, so my plan was to put in a 3.5" layer of insulation between the rafters, then wrap the shower head pipe, then put another layer of (maybe 5.5" or more) unfaced insulation on top of the first.
The result would be that the shower head pipe would be wrapped and then sandwiched between the two layers insulation.
Faced insulation is readily available in the qty I need but unfaced insulation is not, so my intention is to pull the face off of my second layer.
So here are my questions:
Should the first layer of 3.5" insulation between the studs, be faced or unfaced (ie: should I remove the face on my first layer)?
If faced, should the paper be down against the drywall or up into the attic? I've found articles that say both (ie: the bathroom is conditioned vis a vis the attic and that the attic is conditioned vis a vis the outside).