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The lifespan of asphalt shingles is typically between 15 and 30 years, depending on the type of shingle and other factors. Standard 3-tab shingles have the shortest lifespan, around 10 to 15 years. Architectural shingles last longer, averaging 20 to 25 years. Luxury or designer asphalt shingles are the most durable, with a lifespan of 40 years or more. Climate, installation quality, and regular maintenance also play a significant role in how long your shingles will last. Signs that they need replacement include granule loss, bald spots, and roof leaks.

There are several pros and cons of flat roofs. One disadvantage of flat roofs is that you lose potential attic space because it's flat. Flat roofs tend to pool water and because they lack an angle, any leak in the roof—usually due to a bad seal—has the potential to let in a lot of water. They don’t work well in climates with snow. Flat roofs are also structurally weaker than sloped roofs.

A roof overlay will last an average of 15 years, compared to the 20 to 30 years or more that a full roof replacement for a shingle roof will last. An overlay’s lifespan may be shortened even further if there’s underlying damage to the existing roof or structural problems with the roof supports.

There are two main types of roofing shingles: 3-tab and architectural. Architectural shingles cost more than 3-tab but offer a more unique look and can last longer. However, 3-tab shingles are lightweight and affordable, and many people use them for both patching roofs and installing new roofs. Ultimately, the best type for you depends on your budget and your home’s aesthetic.