Reinstall any trim you removed, adding shims as needed around door and window jambs to raise the trim level with the wall paneling. Nail trim to joints between paneling sheets, if desired, to cover edges. Tip Run a level across your walls before attaching furring strips, if applicable. Use...
Apply a thin layer of adhesive to the back of the panel. Set it in place and nail the panel to secure it lightly while the glue sets. Finish nailing along the seams, top and bottom edges. Step 5 Finish by replacing the wood strips and moulding at the top, bottom and seams. Reference...