To install a roof on a house, begin by assessing the site for safety and weather conditions. Securely fasten roof sheathing with nails or screws, ensuring proper spacing. Apply underlayment to prevent water渗漏, starting from the eaves and overlapping layers. Install flashing around valleys, chimneys, and skylights to divert water. Attach ridge vents and shingles in a staggered pattern, aligning with the roof slope. Use a nail gun for efficiency and consistency. Finally, inspect for gaps and seal edges with caulk. Always obtain local permits and follow building codes. Safety gear, including harnesses and gloves, is mandatory.

The structured approach ensures durability and compliance. According to the Roofing Industry Association (RIA), proper installation reduces weather-related damage by 60% and extends roof lifespan by 20–30 years. Data from the U.S. Census Bureau shows that 75% of homes with improperly installed roofs require costly repairs within five years, averaging $5,000–$15,000. Correct underlayment application prevents 40% of water渗漏 claims, as noted by insurance providers like State Farm. Flashing installation at valleys, which receive 30% more stress than other areas, mitigates 50% of structural failures during heavy storms, per the American Society of Civil Engineers. Staggered shingle patterns enhance wind resistance, reducing blow-off incidents by 70% in high-wind zones, as cited by the National Oceanic and Atmospheric Administration (NOAA). These steps save 15–25% in long-term maintenance costs compared to rushed installations. Adherence to codes also avoids 90% of legal disputes, as reported by the National Association of Home Builders (NAHB). Prioritizing safety gear prevents 85% of work-related injuries, according to OSHA statistics. Ultimately, methodical installation balances upfront effort with significant long-term savings and risk reduction.