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A slab door is a standalone door without a frame or hardware. A prehung door is a complete set that includes the door, frame, hinges, and sometimes the doorknob and lockset.

In most cases, a prehung door is the better and easier option to install, especially for DIY projects or exterior applications, as they often come pre-weatherproofed. They require fewer tools and less experience to install properly. Although prehung doors are heavier and have a higher upfront cost, the investment is often worthwhile for a complete upgrade that includes a new frame.

A slab door may be a better choice if you are on a tight budget, have a custom-sized wall opening, or only need to replace the door while keeping the existing frame. While the initial cost is lower, you will need to purchase all the hardware separately and do more DIY work to hang it, which may not result in significant time or money savings.

The best material for a patio door depends on several factors, including your budget, local climate, and priorities like style, security, and maintenance. Wood offers a classic, high-end look but requires regular upkeep. Vinyl is a popular choice as it's affordable, energy-efficient, and low-maintenance, making it a durable option for active households. Fiberglass is another durable material that stands up well to heavy use. For superior security, steel is a low-maintenance option, though with fewer design choices. Finally, lightweight aluminum makes doors easy to open and close, which is ideal for homes with children. The right choice balances durability, aesthetics, ease of use, and the amount of maintenance you're willing to perform.

The most common rough opening for a sliding glass door is 60 inches to 72 inches by 80 inches. A rough opening is the unframed space where your door will go.

The width of your door jamb should match your wall thickness exactly, so it depends on your wall. For standard door openings, the width is equal to the width of a 2-by-4-inch  stud, plus the width of the drywall on both sides—about 1/2 inch each—which comes out to 4 9/16 inches. Block walls and framed walls that use 2-by-6-inch framing require a door jamb that’s 6 9/16 inches. You should always measure your finished wall thickness to get an accurate width for your door jamb material.