The value of regular inspection and maintenance work on commercial roofs was never more apparent than on a recent project completed by Alliant Roofing Company. It involved a multi-tenant commercial building roof recover in a damp environment. While some building owners neglect to protect their investments with regular roof inspections, that was not the case on this project. Alliant had inspected, maintained and repaired this flat roof over many years. The life expectancy of a hot-tar roof (also known as hot mop roof) is about 20 years, and this roof was due for re-covering.