System Plus The System Plus Limited Warranty offers all the features that the first guarantee offers, only with longer periods. Its 100% coverage on material defect is good for 50 years, and the labor reimbursement lasts a lifetime. Once the non-prorated period is up, GAF will shoulder 20% of the labor on repairs in years 51 and beyond. In addition, this mid-level warranty covers the workmanship and misapplication of certain flashings on your replacement roof in Dallas Texas, for two years. Also, it includes the tear-off costs for material defects.