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The width of your door jamb should match your wall thickness exactly, so it depends on your wall. For standard door openings, the width is equal to the width of a 2-by-4-inch  stud, plus the width of the drywall on both sides—about 1/2 inch each—which comes out to 4 9/16 inches. Block walls and framed walls that use 2-by-6-inch framing require a door jamb that’s 6 9/16 inches. You should always measure your finished wall thickness to get an accurate width for your door jamb material.

Barn doors do not always require a bottom track, especially if a high-quality top track is used to stabilize the door. However, a bottom track is often recommended to ensure the door operates smoothly, prevent it from scratching the floor, and keep it from pushing inward or outward, which could cause damage. A bottom track also keeps the door more secure and properly anchored. In some cases, an interior barn door can hang solely from a top track without a bottom guide. If you do install a bottom track, it should be placed six to eight inches from the floor and be at least twice as wide as the door.

Start by checking the top or side edge of the door. Look for a certification label or metal tag stamped with details like the fire rating and information on the manufacturer. Even if it’s painted over, the tag should still be visible. Next, look along the edges for slim intumescent strips. They’re designed to swell up and seal gaps when exposed to heat. Finally, check if the door closes itself. Most fire doors have a self-closing mechanism, like an overhead closer or spring hinges. If none of these are obvious, contact a fire safety professional to help verify your door. 

You can use wood, metal, or plastic as a door shim, but keep in mind that wood will rot easier than the other two materials. Your local hardware store should have at least one type in stock. Alternatively, you can trim a piece of cardboard to fit underneath your door hinge and work as a temporary, makeshift door shim.