What to check after roofers installed new roof? To make sure the work was done correctly, a comprehensive examination must be carried out after roofers have built a new roof. First, make sure the shingles are securely attached and aligned. Check for leaks or gaps in the flashing surrounding skylights, vents, and chimneys. For effective water drainage, make sure the gutters and downspouts are positioned correctly. Verify that all locations are well sealed and look for any missing or loose nails. To prevent further problems, make sure the roofers have cleared the area and taken out all the trash. To ensure that your new roof is sturdy and of high quality, this last check is essential.