Build Floating Shelves What is needed for the jobSupplies 1 – 2 x 4 x 8 1 – 18-in. wide hollow core door 1/4-in. x 3-1/2-in. lag screws 1-in. brads Masking tape Tools Hammer Tape measure Circular saw Stud finder Level Glue Straightedge Table saw 40-tooth carbide blade Related LinksClick here to learn how to build floating shelves.