Step 2 · Install Wall Blocking for Support
A pedestal sink requires solid backing in the wall for support. Use a stud finder to locate the studs on either side of your drain pipe. Use a level and pencil to draw a rectangle on the wall where the sink will be mounted. The top of this rectangle should be at your desired sink rim height (typically 34-36 inches). Carefully cut out this section of drywall using a drywall saw. Measure the distance between the studs and cut a piece of 2x8 lumber to fit snugly. Position this blocking horizontally between the studs, centered at the height where the sink's mounting holes will be. Secure the blocking by driving wood screws through the studs and into the ends of the 2x8 block.