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You can’t gauge the lifetime of a fire door like you could, say, an engine. Fire doors should be checked at least once every six months to ensure there are no signs of degradation like leaks, holes, water damage, termite damage, or anything else that might compromise the functionality of the door’s fire resistance. Check your smoke detectors while you’re at it.

You can use any wood to make an interior door, provided it’s the right thickness. Common options for painted doors include pine or poplar for the stiles, rails, and mullions, and paint-grade plywood for the panels. You can also opt to make your own panels out of pine or poplar if you intend on staining the door instead. Opting for oak, maple, or another hardwood is another great option for a high-end door that will last for decades, but the wood will cost significantly more.

You should hire a licensed and insured door contractor with prior experience installing folding doors. Installing these doors is much more complex than installing a standard sliding door; don’t leave this work to a general handyperson or attempt to install it yourself.

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.