GAF Timberline HDZ System
   •    GAF Timberline HDZ Shingles (Class 3 Impact Resistant)
   •    GAF Z Ridge (standard ridge cap)
   •    GAF StormGuard Ice & Water Shield (valleys & penetrations)
   •    GAF FeltBuster Synthetic Underlayment
   •    GAF Pro-Start Starter Strip
   •    Proper ventilation evaluation (reuse or upgrade if needed)
   •    Code-compliant installation & flashing details