When a floor is uneven the best way to frame a new wall is to set the floor and ceiling plates first.
How to frame a wall on uneven concrete floor.
In this video i show you the method that i use to attach basement framing to a concrete floor.
Walls are built from the ground up.
Use an impact driver to drive a 3 tapcon screw through the wood and into the floor.
Use a long level or a laser to mark straight up from the bottom plates to the ceiling.
Fasten your top plates to the ceiling.
Measure all the studs individually and toe nail them into the plates.
Cut pressure treated 2 x 4 boards to length and lay them along the chalk line.
Snap chalk lines between each set of marks to guide the wall installation later.
Mark the length of the new wall on both the adjoining wall and floor.
Tape a one foot by one foot square of plastic sheeting plastic kitchen wrap will do to the concrete wall in your basement with duct tape and leave it in place for 24 hours.
Slip shims under the low end of the 2x4 rail until it s perfectly level then use a scribing tool to transfer the unevenness of the floor onto the rail.
Use a hammer drill with 3 16 masonry bit to drill a hole through the wood and into the concrete floor.
To resurface an uneven concrete slab begin by laying a long straight 2x4 wooden rail across the concrete slab floor with one end positioned on the high point in the room.
Then remove the tape.
Measure and cut two two by fours one of.