What To Check After Roofers Installed New Roof? After roofers have installed a new roof, there are a few important things to check. First, ensure that all shingles are properly aligned and securely fastened. Inspect the flashing around chimneys, vents, and skylights to confirm they are sealed tightly. Check for any visible gaps or missing shingles. Verify that the gutters are clear and properly connected to direct water flow away from the house. Inspect the attic for signs of leaks or moisture. Make sure that all debris from the installation has been cleaned up, and confirm that the roof is watertight by observing it after the next rain. Finally, ensure that the warranty and installation documents are provided for future reference.