What happens if it rains before shingles are installed?

If it rains while your roof is stripped down to the bare wooden decking or synthetic underlayment before the final shingles are installed, it can lead to significant interior and structural water damage if proper precautions are not taken. Professional roofing contractors always monitor weather forecasts closely and install heavy-duty, water-resistant underlayment or self-adhering ice and water shields specifically to protect the exposed home during open-roof phases. While this underlayment is designed to withstand temporary rain showers during active construction, heavy or prolonged storms can sometimes find weak spots around penetrations, leading to leaks into the attic or living space. If the wooden roof decking becomes thoroughly soaked, contractors must allow it to dry completely before installing shingles to prevent moisture from becoming trapped, which causes wood rot, mold growth, and premature shingle blistering.