We replaced an aging concrete tile roof with a premium, long-lasting roofing system featuring: ✅ Westlake Citadel Plus self-adhered base underlayment for added superior, watertight protection ✅ Westlake Tile Seal HT self-adhered underlayment over base underlayment for maximum, watertight protection ✅ Westlake Barcelona 900 Concrete Tile—engineered for exceptional durability, high performance, and lasting curb appeal