Phase 1 — DECK: Sheathing installed and inspected per structural plan. Plywood/OSB: H-clips at unsupported edges, 1/8 in gaps at panel edges. Verify flatness and nail pattern. Phase 2 — DRIP EDGE: Install at eaves first (under underlayment), at rakes last (over underlayment). Phase 3 — UNDERLAYMENT: Ice & water shield at eaves (min 24 in past interior wall line), valleys, around penetrations. Synthetic underlayment or #30 felt on remaining areas. Horizontal laps 4 in, vertical laps 6 in. Phase 4 — FLASHING: Step flashing at walls (4×5 in min, interweave with courses), valley (W-metal or woven), pipe boots, vent caps, skylight curbs. Counter-flashing into masonry reglets or under siding. Phase 5 — FIELD ROOFING: Start from eave, work up. Stagger courses. Follow manufacturer exposure/overlap. Phase 6 — RIDGE/HIP: Cap shingles or ridge vent with cap. Ridge vent: cut deck 1 in each side of ridge, install vent, cap over. HOLD POINT: pre-roofing inspection (deck, underlayment).