Most residential roofs take 1–3 days to install. Larger or complex roofs may take longer. Weather can cause delays. Preparation and cleanup also add time. Ask your contractor for a detailed timeline.

Flashing is metal placed around chimneys, vents, and joints to prevent leaks. It directs water away from vulnerable areas. Damaged flashing is a common leak source. Inspect regularly and replace when necessary.

Underlayment is a protective layer beneath shingles. It provides backup waterproofing. Common types include felt and synthetic materials. It helps protect against leaks if shingles fail. Required by code in most areas.

Yes, most cities require a permit for major roof work. It ensures code compliance and proper inspections. Your contractor should handle this. Fines can apply for unpermitted work. Always check local regulations.