The New Construction Roofing Timeline: When Each Step Happens
The Quick Answer
On a new construction home, the roof is installed in stages that track the overall build: framing and trusses go up first, then the deck sheathing, then the dry-in (underlayment and ice and water shield), and finally the shingles and flashings. The roof should be dried in as soon as the deck is complete to protect the structure, and the final shingle installation typically happens after the exterior finishes are underway but before final grading and closing.
Building a new home is a sequence of dependencies, and the roof is woven through that sequence from the very first week of framing to the final walk-through. Understanding the new construction roofing timeline helps you know when to inspect, when to ask questions, and when a delay is normal versus a red flag.
Here is the stage-by-stage breakdown of how a roof comes together on a custom home build in Central Alabama.
Stage 1: Framing and Trusses
The roofing timeline begins before any roofing material is on site. Engineered roof trusses (or site-built rafters) are set on the top plates of the framed walls. This is the structural skeleton that determines the roof's shape, pitch, and load capacity.
This stage matters to the roof because the truss spacing (16 or 24 inches on center) dictates the decking thickness required by the IRC — a decision that is locked in here and cannot be changed later without re-engineering. If you plan to upgrade to heavier luxury shingles or a standing-seam metal roof, the trusses must be designed for that load from the start.
Stage 2: Deck Sheathing
Once the framing is set, the deck sheathing — OSB or plywood — is installed and fastened to the framing per the IRC's fastening schedule. As we explain in our decking requirements guide, the panel thickness must match the truss spacing, and the deck must be structurally sound for the manufacturer warranty to be valid.
Watch For
Bare decking left exposed to rain will swell at the edges and lose its structural integrity. The deck should be dried in within 24 to 48 hours of sheathing installation.
Stage 3: Dry-In (Underlayment and Ice & Water Shield)
"Drying in" is the most weather-critical step in the entire build. The underlayment (ideally synthetic rather than basic felt) is rolled across the deck, and self-adhering ice and water shield is applied to the eaves, valleys, and around penetrations. The IRC addresses underlayment in Section R905.1.1 and ice barriers in R905.1.2.
Once the roof is dried in, the interior of the home is protected from rain, and the builder can proceed with plumbing, electrical, insulation, and drywall without fear of water intrusion. This is why the dry-in is often the gating step for the rest of the interior schedule.
Stage 4: Shingles, Flashing, and Ventilation
The final roofing installation — starter strip, shingles, hip and ridge, step flashing at walls and chimneys, pipe boots, and ridge ventilation — typically happens once the exterior finishes are underway. This is also when the attic ventilation components (ridge vents and soffit vents) are finalized to ensure balanced airflow.
Proper nailing is non-negotiable at this stage. Overdriven or improperly placed nails are the leading cause of wind warranty denial, and they are invisible from the ground. This is why the installer's certification matters so much — see our warranty registration guide for why only certified contractors can lock in the strongest coverage.
Stage 5: Final Inspection and Warranty Registration
After the shingles and flashings are complete, a final inspection confirms that the installation meets both code and the manufacturer's specifications. If the installer is certified, the enhanced warranty is registered with the manufacturer within the required window (commonly 30 to 60 days). The registration confirmation and warranty certificate should be handed over before closing.
The Roofing Timeline at a Glance
- Framing & trusses — sets shape, pitch, and load capacity.
- Deck sheathing — OSB or plywood fastened to the framing per IRC schedule.
- Dry-in — underlayment and ice & water shield protect the structure.
- Shingles & flashing — final roof covering, ventilation, and penetrations.
- Inspection & registration — final inspection and warranty registration before closing.
When to Schedule an Independent Roof Inspection
We recommend an independent roofing inspection at two points: once after the dry-in is complete (to confirm the underlayment and ice and water shield were installed correctly while they are still visible), and again after the final shingle installation and before closing. A pre-closing inspection documents the as-built condition of the roof — which is invaluable if you ever need to file a future storm damage claim or pursue a warranty issue.
The Bottom Line
The roof is not a single event in the build — it is a staged process that runs from the first truss to the final registration. Knowing when each stage happens lets you catch problems while they are still easy and inexpensive to fix, and it ensures the strongest possible warranty is in place before you close.
Frequently Asked Questions
Building a Custom Home in Central Alabama?
We handle staged roofing installation, pre-closing inspections, and warranty registration for new construction builds across the River Region.