铝合金实木结构的车库门，由于木材的特性受气候湿度等环境影响，开裂是不可避免。虽然可以通过烘干、油漆等工艺减小开裂，但不能做到完全避免。而铜质车库门，采用外包铜皮和内充聚氨酯的结构，这两种材料都非常稳定，不会出现变形的情况，因此维护保养非常方便。有的用铜皮取代门板聚氨酯发泡门板两面的彩钢板，外观古朴高贵，适用于高档别墅的车库门。
Because of the influence of climate and humidity on the characteristics of wood, the crack of garage door with aluminum alloy solid wood structure is inevitable. Although the cracking can be reduced by drying, painting and other processes, it can not be completely avoided. The copper garage door adopts the structure of outer copper skin and inner polyurethane, both of which are very stable without deformation, so the maintenance is very convenient. Some use copper skin to replace the color steel plate on both sides of the polyurethane foam door panel. The appearance is simple and noble, which is suitable for the garage door of high-grade villa.