I've seen metal doors that look fine, and you feel up underneath them and there's nothing there. Sometimes a door is installed without a threshhold. That's the wooden or metal plate at the bottom of the door. The bottom of the door should be at least one-half inch off the floor. Wooden thresholds also rot, but they are far easier and less expensive to replace than an entire door.
People always try to save money in the short run, but in the long run they're spending big bucks.
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