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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.

As long as you do it carefully, you can sand and restain hollow core doors. However, it’s risky because the veneers on hollow core doors are so thin that sanding and restaining might cause damage to the doors. If you do move forward with this project, sand the doors lightly with a medium-grit sandpaper.

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. 

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.