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How to Restore a Composite Door Composite doors are constructed of 17 laminated layers that are paired with an unbreakable timber core to help keep you safe and warm. However, these doors may suffer from damage due to break-ins and forces exerted on them. Cracks, misalignment and gaps around the frame are all common problems. Fortunately, the majority of these issues are easy to fix! Cracks Composite doors are known for their strength and durability. However, they could develop cracks or splits with time.