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While sliding glass doors are designed to be rainproof and weather resistant, they cannot be considered 100% watertight in conditions with heavy rain or winds. However, maintaining a door properly and ensuring that seals are tight can dramatically reduce risks of water intrusion.

To achieve the correct opening size for a 30-inch door, add 2 inches to the door width and 2 ½ inches to the door height. For example, if you have a 30-inch-wide door with an 80-inch height, then the rough opening would measure 32 inches wide by 82 1/2 inches high

A door frame is not the same as a door casing. A door frame is the framework surrounding the entire door that supports the area from which the door hangs. The frame is made up of multiple parts, including the door jamb, head, and sill.

Casing refers to the trim work located around the door frame. It connects the door frame to the wall with decorative trim.

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.