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How to Restore a Composite Door Composite doors are constructed of 17 layers of laminated wood and a solid core. They are designed to keep you warm and safe. These doors are susceptible to damage from burglaries or force. Common problems are cracks, misalignment of the door, and gaps around the frame. Luckily, the majority of these issues are easy to fix! Cracks Composite doors are known for their strength and durability. However, they may develop cracks or splits over time. These cracks and splits can b