This method works with 1-inch thick steaks. If you have a half-inch thick steak you will end up overcooking it if you use this method. Most grocery store butchers will happily cut a steak to an inch for you. Also, most bulk warehouse shopping clubs sell steaks already cut to 1-inch thicknesses. As a rule of thumb, the thicker the steak, the longer you will need to cook it on the indirect side of the grill after the high heat sear.
For example, a 1.5-inch thick steak will require three minutes of searing over high heat on each side followed by approximately four minutes on each side for indirect grilling. As steak thickness increases, the amount of time required on the indirect side of the grill also increases.