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Guest Bath 3 Insulation and Backing

In working on the Guest Bath, insulating the walls was a given. Bathrooms are neck and neck with kitchens in being the noisiest rooms in most houses. In opening up the walls, we decided early on to replace the drywall on the back wall of the bathroom. It shares a wall with the guest bedroom, and is across the hall from the master bedroom.
Walls
The bathroom has three distinct wall thicknesses. The wet wall is 2×6, the long tub wall is 2×4 flat on the slump block, and the bath/guest bedroom party wall is 2×4.

Insulation
The wet wall is 5 1/2 fiberglass. the dry wall is 3 1/2 fiberglass and the long wall is 1 inch styrofoam.
The Styrofoam at 1 inch leaves a small air space, but compensates for the uneveness of the slumpblock and the mortar joints that were not cleaned up. Trying to flatten walls that have foam that is higher than the stud plane is a recipe for disaster. Not only will your fasteners ‘pop’, but your walls will not be flat. Since this is going to be tiled, this is really important.

It is already very quiet. We are also replacing the window with a dual pane slider unit.

Backing
Bathrooms get more abuse than almost any other room in the house. It pays to install backing for cabinets, fixtures, and towel bars. This photo shows 3/4” plywood as backing for a shelf above the the toilet, and backing for the back of the pedestal sink.
Backing installed to provide secure area for screwing bars and fixtures
We also installed backing on the dry wall for the towel bars. I made the backing wide and tall to give the client latitude for the shelf and to have enough for bolting the sink to the wall.