Headroom is defined as the available space over the door height. Depending on the product selected required headroom for a standard installation is typically between 12 and 18 inches.

Normal Thickness: Typically, garage doors are between half an inch to 1 inch thick. This is thick enough to provide some separation between you and the external environment. However, in the end, it's only a small sheet of material. Thus, it tends to be susceptible to dents.

The most common radius sizes are 18” and 21”. For example, a 7' tall garage door typically comes with four 21” panels. Whereas an 8' tall garage door comes with three 18” panels and two 21” panels. Most homeowners will never notice the different size garage door panels.