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。
Aluminum alloy solid wood garage door, due to the characteristics of wood, affected by climate and humidity and other environmental factors, cracking is inevitable. Although the cracking can be reduced by drying and painting, it can not be avoided completely. The copper garage door is made of copper skin and polyurethane. The two materials are very stable and will not deform. Therefore, the maintenance is very convenient. Some use copper skin to replace the door panel, polyurethane foam door panels on both sides of the color steel plate, the appearance of simple and noble, suitable for high-grade villa garage door.
聚氨酯是导热系数极低的材料，广泛用于冰箱等需要隔热的场合，铜质车库门由于填充了5cm厚聚氨酯，保温性能要较实木车库门更好。
Polyurethane is a material with very low thermal conductivity, which is widely used in refrigerators and other occasions where heat insulation is needed. Copper garage door is filled with 5cm thick polyurethane, so its thermal insulation performance is better than that of solid wood garage door.