What is Material Warranty?

Definition

A manufacturer's written promise to repair or replace roofing materials that fail due to defects in manufacturing during a specified period. For architectural shingles, material warranties range from 25 years to "lifetime" (prorated after the first 10-15 years). Enhanced warranties (e.g., GAF System Plus or Owens Corning Platinum) require installation of the complete manufacturer system including underlayment, starter strip, and ridge cap. Warranty coverage reduces significantly after year 10-15 due to proration.