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You have several options when choosing the best lumber for your door jamb. Pine is the most common material due to its resistance to swelling. Fir is strong and durable. You could also go with birch or alder. Any wood with a tight grain will work for this project.

Generally, hinged French patio doors are considered more secure than sliding glass doors. French doors typically feature a more robust, solid frame that can support multi-point locking systems and deadbolts, securing the door at several points and making them harder to break into. In contrast, sliding doors often rely on a single lock and operate on tracks, which can be a security vulnerability. While you can add security bars and other features to enhance a sliding door's security, a well-made French door is often more secure on its own. Ultimately, the overall security of any patio door depends on the quality of its materials, the locking hardware, and proper installation.

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.

Start by checking the top or side edge of the door. Look for a certification label or metal tag stamped with details like the fire rating and information on the manufacturer. Even if it’s painted over, the tag should still be visible. Next, look along the edges for slim intumescent strips. They’re designed to swell up and seal gaps when exposed to heat. Finally, check if the door closes itself. Most fire doors have a self-closing mechanism, like an overhead closer or spring hinges. If none of these are obvious, contact a fire safety professional to help verify your door.