Thoroughly read and follow the instructions as well as local building codes. is plumb, level and square with proper clearance. ABSTRACT: Use this site prep guide in conjunction with the Sliding Door Automatic Control Site Prep Instruction. Operate hand/power tools safely and follow the. To install a sliding door, measure precisely, prepare a square and level opening, fit the frame with shims, slide in panels, seal edges, and adjust rollers. Installing a sliding door isn't just about looks—it transforms how your space feels and functions. Sliding patio doors, also referred to as patio doors, are typically made of durable glass and steel, aluminum, vinyl or wood frames. Installing one in your home can seem daunting, but with the right preparation and tools, it's a doable DIY project for a handy homeowner.