InsulationAny of a variety of materials designed to reduce the flow of heat from or into a building. See thermal insulation.Related Articles:Commercial Roofing Project: The #1 Best Cover Board4 Interior Signs of Roof Damage and LeaksThe 4 Best Options for Repairing or Upgrading EPDM Roofs - Part IBest Commercial Roofing AtlantaWhat is a Built-Up Roof System?« Back to Glossary