Short Answer
Roofing installation requires appropriate weather conditions. Active precipitation can compromise installation quality and safety.
Detailed Explanation
Roofing should not be installed during active rain. Rain compromises the installation in multiple ways: underlayment and ice and water shield may not adhere properly to wet decking, shingles may not seal properly, and wet surfaces create serious safety hazards for workers on the roof. Additionally, rain during tear-off exposes the roof deck and interior to water intrusion. A professional contractor monitors weather forecasts and schedules installation during appropriate weather windows. If unexpected rain occurs during a project, the contractor should have procedures to temporarily protect the exposed roof with tarps until weather improves. The safety of workers and the quality of the installation both require dry conditions.
Why It Matters
Installing roofing in the rain compromises quality and safety. A professional contractor will reschedule or temporarily protect the roof.