Best practice for insulation in exterior wall of bathroom
I have a project here in Columbus Ohio where we are adding a bathroom in the attic space. So we are gutting everything to the stud. The existing house has aluminum siding over the old cedar clap boards, over 1x planks. Due to budget constraints, we are using fiberglass batt insulation in the walls. 2/3rds of the exterior wall will be covered with a cement backer board, the Schluter-KERDI waterproofing membrane and ceramic tile. The remainder of the wall will be Dens Armor Plus paperless drywall.
The intent was the kraft facing on the batt insulation was going to be our vapor retarder. However the installers removed the kraft facing in the bathroom exterior walls only. Stating the building inspector will not approve the kraft facing in the bathroom. Can anyone explain the inspectors logic and what would be a best practice for insulating an exterior bathroom wall in an existing home?
GBA Detail Library
A collection of one thousand construction details organized by climate and house part