To start construction of the framing, measure 3-3/4" from an existing end wall, and use a long straightedge to mark 6' away from the mark on both sides. Snap chalk lines to indicate placement of the walls. Mark out the sole plates. Mark the stud location 16" on-center.
Cut the lumber and assemble the first wall with a framing nailer before anchoring it to the existing wall.
Build the second wall the same way, but add framing for the door, as well as a header and some blocking.
The last wall is simpler than the first two, because it just spans the area between the two other walls and has no special features to be measured and cut. Position the final wall and secure it to the other two.
Plan the dividers for the interior of the room. These dividers will allow separation of clothing and equipment and can house a shelf and clothing rod. Frame the dividers the same as the other walls (image 1), anchoring it to the existing interior wall (image 2). Then anchor it to the concrete floor with masonry screws.
With the walls framed, use drywall to cover both the inside and outside studs. To save time, the cover the inside walls with beadboard. Finish the outside with joint compound and paint. To install the drywall, start two nails at the edge of a sheet of drywall. Lift the drywall with one hand, sliding it into place, and using the other hand to sink the nails and secure the sheet (image 1). Add the drywall for the long wall and check for plumb and square. Add a long diagonal brace (image 2). Remove the brace once the entire wall is covered by drywall.
With the drywall in place, use a rotary tool to remove the drywall from the doorway.
Apply joint compound to the seams and nail holes on the exterior drywall. On each seam, apply a layer of joint compound, followed by tape and another coat of mud. Use a wide putty knife to smooth the compound after application.
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