Roof Replacement Process
What a roof replacement looks like day-by-day — material delivery, tear-off, deck inspection, underlayment, flashing, shingles, cleanup, walkthrough. What to check before final payment.
A roof replacement is one of the more disruptive home projects a homeowner experiences: noise, debris, people on the property, and several days of weather risk. Knowing what happens at each stage — material delivery, tear-off, deck inspection, underlayment, flashing, shingle install, cleanup — lets you ask informed questions and recognize when something is being skipped. This guide walks through the standard sequence and the things worth checking before the final payment is released.
Before work starts
The day before crew arrival, expect: a permit posted visibly on the property (often on a window or front door), a delivery of materials (shingles, underlayment, flashing, fasteners) staged in the driveway or yard, and protective tarping along the perimeter of the house to catch debris. The contractor should walk through with you confirming the project scope, identifying landscape protection priorities (pool equipment, HVAC condensers, plants), and reviewing the timeline. Cars should be moved off the driveway. Pets should be planned for elsewhere during noisy hours.
Material delivery
Verify the materials delivered match the contract: shingle brand and line should be visible on the pallets, color should match what you selected, underlayment brand should match the contract spec, flashing materials should be present (not all reused). If something doesn't match, photo-document it and raise it with the contractor before tear-off begins. Material substitution is much harder to remediate once installation starts. The material-delivery payment milestone (commonly 30–40%) is the natural moment for this verification.
Tear-off
Tear-off typically takes the first day of a 2–3 day project. The crew uses shovels and roofing forks to lift shingles and underlayment, drops debris into a dumpster or onto tarps below, and works systematically across the roof slopes. The site is noisy and dusty. The deck becomes visible as tear-off progresses — this is when deck damage gets identified. Tear-off should not leave the deck exposed overnight; the crew should at minimum cover any in-progress areas with tarps before leaving for the day.
Deck inspection
Once the deck is exposed, the crew inspects for rot, soft spots, and damage. Most quotes include 'up to 2 sheets' of replacement; anything beyond requires a written change order at the contracted per-sheet rate ($80–$120). If significant rot is found, the project pauses while the change order is approved. Photo-document any damaged sheets before they're removed — useful for insurance if the underlying cause was a long-running leak. The deck-inspection moment is when budget surprises happen; clarity on the per-sheet rate in the contract prevents arguments.
Underlayment installation
After deck inspection and any necessary replacement, the crew installs underlayment across the entire roof. Modern installations use synthetic underlayment (Titanium UDL, RhinoRoof, or similar) rolled out and fastened with cap nails or staples. Ice and water shield (self-adhering rubberized membrane) goes in valleys, around penetrations, and along eaves per California code. Underlayment installation typically completes within a few hours. Once underlayment is on, the roof is weather-protected even if shingles aren't installed yet — this is the natural rain-pause point.
Flashing and ventilation
Flashing is installed before shingles at most locations: starter flashing along eaves and rakes, valley flashing in V-shaped intersections, step flashing along walls, base flashing around chimneys and skylights. New pipe-vent boots replace old ones. Ridge vent slots are cut (if applicable) and the ridge vent material is installed. Bath/kitchen exhaust fans being re-routed to the roof get their dedicated vents at this stage. Once flashing and ventilation are in, the roof is ready for shingles.
Shingle installation
Shingles install in sequence: starter strip along eaves and rakes, full courses working up the roof slopes, valley shingles cut and fitted, ridge caps along the peak. Nailing pattern matters — most manufacturer warranties specify 4 nails per shingle with specific placement (above the sealing strip). Wind-resistant installations may require 6 nails. The crew should not nail above or below the manufacturer-specified line; both can void warranty. A typical 25-square asphalt re-roof takes 1.5–2 days of shingle installation.
Cleanup
Cleanup happens daily (during the project) and as a major operation at the end. Daily cleanup: debris swept off the roof and out of gutters, dumpster managed, tarps re-positioned for the next day. Final cleanup: full perimeter magnetic-nail sweep multiple times in different directions, gutter clearing, removal of all debris and packaging, removal of dumpster, restoration of landscape tarping. The magnetic sweep is the highest-correlation indicator of a thorough contractor — it costs them almost nothing but reveals attention to detail.
Final walkthrough
After cleanup, the contractor walks the project with you. Together you check: visible shingle work for consistency and defects, flashing installation at every transition, gutters clear and drip edge properly oriented, debris fully removed, landscaping undamaged, magnetic sweep complete. A 'punch list' captures any small items needing follow-up. Photo-document the punch list — both as a record of what's owed and as a milestone date. The final walkthrough produces a list of remaining items, not approval to release final payment.
What homeowners should check before final payment
Before releasing the final 20–30% holdback, confirm four documents: (1) city inspection sign-off (paper or digital — confirms the project passed code inspection), (2) unconditional lien release from the contractor (confirms the contractor has been paid in full and won't file a mechanics lien), (3) conditional lien releases from each material supplier (confirms suppliers have been paid and won't file liens on your home), (4) manufacturer warranty registration confirmation (proof the warranty is active). Without all four, the leverage to fix anything missed disappears once final payment is released.
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Frequently asked questions
How long does a typical roof replacement take?
Two to three days of crew work for a 25-square single-family asphalt shingle re-roof. Tile, metal, and larger or steeper roofs take longer. The project-start window (from permit issuance to crew arrival) is typically 2–4 weeks; the active work itself is short.
Do I need to be home during the roof replacement?
Not strictly — but being available for the deck-inspection stage is useful in case rotten plywood is found and a change order is needed. Many homeowners step out for parts of the work because the noise is significant.
What should I check before releasing the final payment?
Four things: city inspection sign-off (paper or digital), lien releases from the contractor and material suppliers, completed manufacturer warranty registration, and a walkthrough punch list confirmed. Hold final payment until all four are documented.
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HomeGoSmart is not a contractor and does not provide legal, financial, or construction advice. Homeowners should verify license, insurance, references, permits, and written contract terms before hiring.