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Interior door thresholds are usually attached using finish nails, and some contractors will also use construction adhesive under the threshold to hold it in place. Exterior door thresholds are more commonly screwed to prevent them from pulling up when people step on the raised edge on the outside of the door. Exterior doors also include caulk sealant on the inside to prevent water and air from seeping through.

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.

When choosing a door for the space between your garage and house, steel is your best bet for fire safety. While wood—and sometimes glass—doors are common, they have lower fire-ratings. Fire-rated steel doors can withstand flames for up to three hours—double what wood can manage (90 minutes). Glass, while non-combustible, can crack under extreme heat. Steel may cost more, but it also offers the best protection. Steel isn’t the most aesthetically pleasing choice, but as long as your door meets the International Residential Code (IRC) standards, it’ll do its job in protecting your family and home.

A prehung door is a door that comes ready to install, already mounted in its frame with hinges and stop molding included. Because everything is factory-aligned, installation is quicker, more precise, and convenient, as you don't need to drill or align the hinges yourself. This makes it a smart option if your current frame is damaged, uneven, or if you're working on a new build. Installation involves fitting the entire unit into the rough opening, shimming and leveling it, and then securing it. If you are replacing an existing prehung door, the process is even simpler, often just requiring you to swap the old unit for the new one and secure it with a few screws. Prehung doors typically cost only slightly more (around $20) than a door slab alone, making them an efficient choice.