Shim under the bottom plate to level it if necessary then nail it into the floor joists with 16d nails.
Framing out an attic.
Stand the front wall and align it with the marks on the floor.
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.
Plumb the corners with a level and brace them with 2x4s.
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.
Install the lower header with joist hangers figure a and assemble the front wall on the attic floor.
Collar ties are horizontal members that like rafter ties extend from rafter to rafter but.
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.