Thresholds

A door threshold bridges the gap between the door bottom and the floor, keeping out drafts, water, and debris while providing a smooth transition between surfaces. Height and width are the critical measurements — too tall and the door drags, too short and you lose the seal. Aluminum and hardwood are the most common materials, with aluminum holding up better on exterior doors exposed to weather and foot traffic, and wood offering a cleaner look on interior thresholds or finished entryways. M-D Building Products is a reliable name for standard residential threshold replacements in most common sizes.