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A door sill is the horizontal part of the door frame at the bottom, while a door jamb consists of the vertical parts of the frame on either side. The door sill serves as a threshold, sealing the bottom of the door, while the door jamb provides structural support and houses the hinges and latch. Both are essential components of a door frame, with the door sill acting as a transition point and the door jamb providing stability and functionality.

If a wooden door swells from temporary humidity or moisture, it should return to its original size as the environment dries out. However, if the door remains swollen due to prolonged exposure to moisture or water damage, it may not fully revert to its original shape and could require repairs or replacement. Using a dehumidifier and ensuring your doorway has good ventilation can help prevent and reduce swelling in wooden doors.

You should prime interior doors before painting for the best results. If you do paint directly on the wood, you could see some of the grain patterns show through the paint, in which case you’d need to apply additional coats. Priming the surface before painting will reduce the number of coats and can better cover the grain pattern for a clean, finished look.

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.