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A door swells up when there’s a lot of moisture in the air. Wood doors are porous, and the elements can cause them to expand with humidity and contract with dry air. Prevent swelling by coating the door in weather-resistant paint, which creates a barrier to seal out moisture. Otherwise, go with a water-repellent finish after the fact. On the plus side, this problem will go away once the weather changes.

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.

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.

Most modern, standard doors are 1 ⅜-inches thick, so you should aim for this thickness unless you're building a door to replace an antique door or fit into a non-standard wall opening. Thickness varies when installing a pocket door or sliding barn door, so a good rule of thumb is to measure your existing door, if possible. For standard doors, you can also measure from the inside of the door to the door stop to gauge the proper thickness.