How to Frame a Wall - Basements101.com
How to Frame a Wall on the Floor and Raise it into place.
Cut and mark the plates... Using your floor layout as a guide, mark and cut 2x4s for the top and bottom plates. Place them on edge beside each other and mark for the studs. The first stud will be at the end of the wall. The remaining studs should be 16 inches on center, meaning that from the edge of the wall to the center of each stud will be a multiple of 16. Make a mark every 16 inches; then with a combination or speed square draw lines 3/4 inch on each side of your first marks. Draw an X in the middle of the marks to show where to nail the studs.
Assemble the wall...Working on a flat surface, lay the studs on edge between the top and bottom plates. It helps to have something solid, such as a wall, to hold the framing against while you assemble and nail the wall. For speed, nail one plate at a time to the studs. Drive two 16-penny nails through the plate and into the ends of each stud. Because hammer blows tend to knock studs out of alignment, continually double-check your work while nailing. Keep the edges of the studs flush with the plate edges. If any of the studs are twisted or bowed, replace them.
Raise the frame...Framework can be cumbersome, so have a helper on hand. Position the bottom plate about where it needs to go and tip the wall into position. If the wall fits so tightly against the ceiling that you have to hammer it into place, protect the framing with a scrap of 2x4 as you pound. Tap both ends of the frame until it is roughly plumb in both directions. Instructions for Framing walls in place.
Snug the frame with shims...If the wall is a bit short in places, drive shims between the bottom plate and the floor or between the top plate and the ceiling joists. Have your helper steady the framework while you drive the pieces in place. Drive shims in from both sides, thin edge to thin edge, to keep the plate from tilting.
Fasten the frame to wall and floor...Once the frame is snug, recheck that the wall is plumb in both directions. Check both ends of the wall and every other stud. Fasten the top plate to the ceiling by driving in a 16-penny nail through the plate and into each joist. Fasten the bottom plate to the floor. Use 16-penny nails if the floor is wood; use masonry nails or a power hammer if the floor is concrete.
Tip...When you finish your concrete basement, be sure to use the right kind of lumber for the plates. The sole plate (the bottom 2X4 that sits on the floor) should be treated lumber. That way, it won´t be affected by any moisture that could leech up through the concrete floor. The rest of the wall (the upright 2X4´s and the top plate) are standard lumber.
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Common Framing terms and their Definitions:
Bottom Plate: The lower horizontal member of a wood-frame wall nailed to the bottom of the wall studs and to the floor. The bottom plate sets on the floor or subfloor