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To support the upper countertop, install six 3"x12" steel plates along the top of the wall.
Use a circular saw to cut several grooves into the top of the 2x4 wall, and chisel out the thin ridges so the plates will sit flush to the top.
Ensure that the plates are installed over the stud locations to create even more support. Set in the first of two pieces that will create the lower countertop. Get help carefully lifting and positioning the heavy granite.
Carefully set the other half in place, and slide up and over beside the first piece, making sure the seams are even.
Use a 1/16" plastic shim to level the two tops. Fill the gap with silicone latex caulk. To set the granite backsplash, apply caulk to the back surface and press onto the drywall.
Use longer screws to raise the electrical outlets flush with the new backsplash. Turn the power back on when finished.
To make sure the upper countertop sits evenly, place plastic shims across the top of the wall using silicone caulk to prevent sliding.
For areas with larger gaps, use pieces of 1/4" luan as spacers. Apply a generous amount of caulk along the top of the wall, and set the first piece of countertop into position.