Why do doors have a gap at the bottom?

Doors often have a gap at the bottom for various reasons. One of the main reasons is the need for adequate ventilation. The gap allows air to circulate and moisture to escape, helping to prevent mold growth and moisture damage. This is especially important in rooms such as bathrooms or kitchens, where moisture occurs more frequently.

Another reason for the gap is thermal expansion. Materials such as wood or metal can expand or contract with changes in temperature. The gap allows the door to move freely without warping or sticking.

In addition, the gap can also serve to compensate for uneven flooring. If the floor is uneven, the door can be opened and closed more easily through the gap without dragging on the floor or jamming.

It is important to note that the gap should not be too large, as this can lead to drafts and energy loss. Therefore, it is advisable to use a door seal to close the gap and minimize energy loss.

Overall, the gap at the bottom of the door serves various purposes such as ventilation, thermal expansion, and floor compensation.