Most of us welcome the summer sun after a cold winter, but commercial building owners need to be attentive to the potential roof damage that can be caused by severe heat. Under normal conditions, Mother Nature is not always kind to flat roofs. Regular inspections are a cost-effective way to prevent big expenses due to weather damage. Commercial roofs expand and contract in prolonged high temperatures, and any flat roof system is vulnerable to damage. While most roofing systems are designed to have some movement, extreme temperature swings put any roof to the test.