What are these walls?
DW and I are preparing her mother's house for an estate sale. The house was built in 1929. The walls are not plaster and lathe - nor are they drywall. They seem to be a stiff thin material - something like masonite or homasote.
There are vertical cracks - where the panels butt up against each other. How do I fix these? Paper tape and spackle?
All replies welcomed.