Plumb the corners with a level and brace them with 2x4s.
Framing out an attic.
The plywood will create a smooth strong ceiling without having to apply drywall tape and mud to the ceiling.
Use screws to attach sheets of birch plywood to the angled ceiling over the insulation making sure to drive the screws into the ceiling joists.
Collar ties are horizontal members that like rafter ties extend from rafter to rafter but.
Stand the front wall and align it with the marks on the floor.
This is the full view of the attic.
It s got a 2x4 stringer running down the middle of the attic space on the floor as well that i d like to remove in order to have a flat subfloor all the way across.
Run the plywood down to the top of the knee wall.
If you want your attic space to have a flat ceiling you ll need to add collar ties to the framing.