You are adding the curb because in a previous post you admitted to pouring the slab with no curb. Cmon now, fess up. You can, and should add a level curb If it were me, I would hammer drill holes around the perimeter about every three feet to receive No 4 (1/2") rebar that sticks up about 7 inches. Form by Riping 2 x 12 to the slope of your floor so the top is LEVEL. Make the curb about 8 inches wide. Have someone make up a Z metal pan that has a 2 inch upturned lip inside, goes across under the curb, and turns down the outside of the slab about 2.5 inches with a drip. cut holes for the rebar and install pan by setting in urethane sealant NP1 is good, as is Bostic Chem calk 900. Ring rebar. Set that pan working fro low to high. Door to back of garage.
Put skewback on top of form to form 45 at top. pour curb with 3400 PSI concrete, and tap all around with hammer to remove honeycombs. Trowel top smooth. Use redhead anchors to secure PT sole plate over termite shield.