New construction issues: 

There can be several issues that arise in new construction roofs. It's important to note that the quality of the construction and the materials used can greatly influence the likelihood of these issues occurring. Here are some common problems that can be encountered in new construction roofs:

1. Leaks: Even in new construction, leaks can occur if the flashing around roof penetrations (such as chimneys, vents, or skylights) is not properly installed or if the roofing material is not correctly applied.

2. Poor Installation: If the roofing materials are not installed properly, it can lead to a variety of problems, including buckling, curling, and premature wear.

3. Inadequate Ventilation: Proper roof ventilation is essential to prevent moisture buildup in the attic. Without it, you can experience problems like mold growth and reduced energy efficiency.

4. Material Defects: Sometimes, the roofing materials themselves may have defects that aren't immediately apparent. These can lead to problems like premature deterioration or failure.

5. Design Flaws: Roof design flaws, such as improper slope or drainage, can lead to water pooling, which can damage the roof over time.

6. Environmental Factors: Weather events and environmental factors like storms, hail, and extreme temperatures can damage roofs, even if they are new.

7. Pest Infestations: Pests, such as birds or rodents, can damage roofing materials or find their way into the attic if there are openings or vulnerabilities in the roof.

8. Lack of Maintenance: Even new roofs require regular maintenance. Failure to clean gutters, remove debris, or perform other routine tasks can lead to issues over time.

9. Expansion and Contraction: Roofing materials expand and contract with temperature changes. If they are not properly secured or if there's insufficient allowance for this movement, it can lead to problems.

10. Flashing Problems: Flashing, which seals joints and edges of the roof, can deteriorate over time. If it's not properly installed or maintained, it can lead to leaks.

11. Ice Dams: In cold climates, ice dams can form on the roof's edge, causing water to back up under the shingles and potentially lead to leaks.

12. Shrinkage: Some roofing materials, like single-ply membranes, can shrink over time, causing stress on seams and fasteners.

13. Poor Insulation: Insufficient insulation can lead to heat loss, which can result in ice dams, higher energy bills, and reduced overall roof longevity.

To minimize the risk of these issues, it's essential to work with reputable contractors who use quality materials and adhere to best practices during construction. Additionally, regular roof inspections and maintenance can help catch and address problems early, extending the lifespan of the roof and preventing costly repairs down the road.