Cut two two-by-six studs to fit between the floor and the top of the post. Use treated lumber or cut a bottom plate out of treated lumber whenever contacting a concrete floor with framing members. Cut the studs a little long so that friction will help you hold them in place while attaching the L-brackets.
Apply construction adhesive liberally with a caulking gun to the side of the post. The adhesive helps to hold the stud firmly against the post and keeps the stud from bowing out and cracking the drywall.
Wedge the two-by-six in place and align it with the beam above. Use your level to set it plumb.
Attach the top of the two-by-six to the framing above with 8d framing nails or 2 1/2-inch drywall screws. If using screws, drill a pilot hole to keep the lumber from splitting.
Slide an L-bracket up to the bottom of the post and attach it with 1 1/4-inch drywall screws. If your brackets are narrow, install a bracket about 3/4 inch from each side.
Drill through the brackets into the concrete with a rotary hammer drill and a 1/4-inch masonry bit, then drive in the concrete anchors. Verify that the framing is set exactly vertical or plumb.
Install the other two-by-six on the opposite side of the jack post as described in Steps 2 through 6.
Install 1/2-inch drywall around the post. Run a corner bead with the caulking gun, finishing with joint compound, and sand smooth.
Things You Will Need
- Circular saw
- Rotary hammer drill
- Construction adhesive
- Caulking gun
- 2 two-by-six studs
- 8d framing nails or 2 1/4-inch drywall screws
- 1-inch concrete drive-in anchors
- 1/4-inch masonry bit
- 1 1/4-inch drywall screws
- 1/2-inch drywall
- Joint compound
- Corner bead
- 100 grit sandpaper
- Sander pole or sanding block
- To keep the finished post as narrow as possible, cut the studs to a width that is about 1/2 wider than the jack post. This allows you to set the post exactly vertical if it is not already. In some applications, you may need to attach L-brackets to the two-by-six studs and the beam above to firmly hold the post in place.