I recently bought a house and just noticed that the underside of the window seat is not finished. It looks like a regular sheet of plywood. Also, there is no flashing or caulk where the underside of the window seat meets the house. The exterior of the house is painted cedar shingle.
If anyone can help me out with what to do, I would appreciate it. Some questions:
1) Shouldn't this be finished?
2) I imagine that I would use a house wrap like Tyvek on the plywood.
3) What do I put over the Tyvek since no one will see this (i.e. on the underside of the window seat)? A sheet of aluminum?
4) How do I finish the right angle where the underside of the window seat (plywood) meets the house (cedar shingle)?