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Generally, roof flashing is installed under the shingles to create a watertight seal and prevent moisture from seeping in and causing damage. However, the exact placement can depend on the type of flashing. For instance, with step flashing, the shingles and flashing overlap each other, meaning the flashing is technically both over and under the shingles. Flashing also typically goes beneath the house siding and is often not visible from the ground.

There is a weight limit for walking on a roof, but it’s determined by your roof structure and not the roofing material, at least in the case of a metal roof. Consider that entire teams of roofers will be on top of your home during the installation, so the weight of a single person won’t compromise your roof. That isn’t the case for something like a tile roof, so a high weight limit is one benefit of a metal roof.

A well-maintained tile roof can last anywhere from 40 to over 100 years, with its exact lifespan depending on the material and level of care. Proper maintenance, which includes keeping the roof clean, free of debris, and performing routine repairs for any cracked tiles, is crucial for longevity. The lifespan varies significantly by tile type:

• Clay, terracotta, and slate tiles are highly durable and can last over 100 years.

• Concrete tiles typically last from 30 to 100 years.

• Metal tile roofs generally last between 40 and 70 years.

• Composite tile roofs have a lifespan of 20 to 50 years.

Be aware that maintenance for a tile roof can sometimes be more expensive than for an asphalt roof.

Architectural shingles typically last between 20 and 30 years, though most homeowners should plan on replacing them every 20 to 25 years. While some manufacturers offer warranties for 30 to 50 years, especially for extreme weather, achieving such a long lifespan is rare. The actual lifespan can be shorter in areas prone to strong winds, hailstorms, or other extreme weather. It is recommended to replace your roof before it reaches the end of its life to reduce the risk of roof failure, leaks, and costly property damage. Scheduling regular roof inspections will help you determine your roof's remaining life and identify the best timeline for replacement.