Texas Roofing Installation Information and Certification for Reduction in Residential Insurance Premiums is a program offered by the Texas Department of Insurance (TDI). It provides homeowners with information on installing roofs with the proper materials and techniques to reduce the risk of damage from wind and hail. The program certifies roofing contractors and provides homeowners with a certificate to prove that their roof has been installed according to the TDI’s standards. This certification can then be used to decrease insurance premiums. There are two types of Texas Roofing Installation Information and Certification for Reduction in Residential Insurance Premiums: Class 4 certification and Class 5 certification. Class 4 certification is for roofing projects that use asphalt shingles, and Class 5 certification is for roofing projects that use other materials such as metal or slate. Both types of certifications require that the roofing contractor has met TDI's requirements and provided the necessary documentation.