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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.

Many doors can be cut to size, but it depends on the door material. Solid wood doors are relatively easy to trim to a specific size, while hollow core and metal doors are trickier and can usually only be shaved down a little before you risk damaging them. If your door needs a lot of adjustment, it's best to order a custom size or have a pro do the resizing to make sure it holds up over time.

WD-40 can temporarily silence a squeaky door hinge, but it is not recommended as a long-term solution. While it is effective at breaking down rust and grime, it contains very little lubricant and evaporates quickly. Using WD-40 can also attract dirt and dust to the hinges, which may cause more wear and tear over time. For a more lasting fix, after cleaning the hinge, apply a true lubricant. Better options include silicone spray, white lithium grease, metal or plastic lubricants, or oil-based products like petroleum jelly.

You should hire a licensed and insured door contractor with prior experience installing folding doors. Installing these doors is much more complex than installing a standard sliding door; don’t leave this work to a general handyperson or attempt to install it yourself.