For roof repair, a contractor will typically inspect the roof, diagnose specific issues like missing shingles or damaged flashing, seal leaks, and replace damaged sections carefully to ensure a good match with existing materials. It's about targeting specific problems.

​For a complete replacement, the crew removes the old roofing, inspects the wood deck beneath, repairs any rot, puts down a new water resistant underlayment, installs new flashing, lays the new shingles or other material, and finishes with ridge caps and ventilation. It's a complete overhaul.