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While not strictly required, it is highly recommended to shim both sides of a door. Shimming both sides allows you to make minor adjustments for wall framing that isn't perfectly plumb, ensuring the door is level and hangs evenly. This practice helps the door swing open and close smoothly, reduces the chances of the frame warping, and can be used to center the door within the wall opening. If you are working alone, you may find it easier to remove the door slab to lighten the weight while supporting the frame and inserting the shims. With two people, the process is generally faster and easier, whether the slab is left in place or not.

Like many common door problems, warping can be caused by improper installation. When a door isn't installed correctly, there's a good chance that the poor seal is allowing moisture and drafts to seep through. When this happens, humidity will build up in the wood until it swells and warps.

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.