Knowing the metal roof installation process before it starts helps you plan and reduces stress. A typical metal roof installation takes 2–5 days for the actual work, but the full timeline includes preparation and inspections. Here’s what happens.
Step 1: Pre‑Job Preparation. Your contractor will verify permits, order materials, and schedule the crew. A dumpster is usually delivered for old roof debris. For how to prepare your property, see the installation overview.
Step 2: Tear‑Off of Old Roof (If Applicable). In many cases, metal can be installed over an existing asphalt roof, but a full tear‑off is often recommended to inspect the deck and ensure proper ventilation. If decking is rotted or damaged, sections are replaced.
Step 3: Install Underlayment. A high‑quality synthetic or self‑adhered underlayment is installed over the entire deck. This provides a secondary water barrier. For more on this critical layer, see the installation process.
Step 4: Install Panels or Shingles. The metal panels, shingles, or tiles are fastened according to the manufacturer’s specifications. For standing seam systems, hidden clips allow for thermal movement. Flashing and trim are installed at all transitions.
Step 5: Cleanup and Inspection. The crew cleans up debris and metal shavings. A building inspector verifies the work meets code.
Step 6: Final Walkthrough. The contractor walks you through the completed roof and explains the warranty.
For the type of metal roof you’ll choose, see types of metal roofs. For help selecting the contractor, see how to choose a licensed installer. And for errors to avoid, see common installation mistakes.