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A roof's ability to handle snow depends on its strength and the snow's weight, as wet snow is much heavier than dry, fluffy snow. While designs in snowy regions often allow for 35 to 50 pounds per square foot, a general guideline is that a typical roof can withstand about four feet of fresh snow, two feet of packed snow, or just one inch of ice. Factors like the roof's age, slope, and support structure also affect its capacity; newer, sloped roofs generally hold more weight than older, flat ones. Ice and ice dams add significant, dangerous weight. Because capacity varies, it is best to contact a professional roofing contractor or the original builder to determine the maximum snow load for your specific home.

Many insurance policies will not cover a roof with two layers of shingles. An additional layer of shingles increases the risk of various kinds of damage, and insurers typically won’t pay claims on a roof with an overlay. Adding a layer of shingles may even jeopardize your insurance coverage entirely, so check your policy to ensure you stay within coverage guidelines. 

You can enjoy your TPO roof by making it into a rooftop deck. However, homeowners should use caution when hosting events on the roof. Specifically, no one should ever smoke a cigarette on a TPO roof, as they could burn holes in the roofing material and cause leaks. Also, it can be slippery. Homeowners can buy no-slip walk pads to keep people safe on the roof. You can also install a "floating deck" over the top of the TPO,  but your roofer has to be sure to never put any fasteners through the TPO.

A roof's lifespan can range from 15 to 200 years, with an average of 25 to 50 years, depending heavily on the material, quality of installation, maintenance, and local climate. Asphalt shingle roofs are common and typically last 15 to 30 years; three-tab shingles have a lifespan of about 20 years, while architectural shingles can last up to 30. More durable materials have longer lifespans: metal roofs last 30 to 100 years, clay and concrete can last 50 to 100 years, and slate roofs can last up to 200 years with proper care. Regular maintenance, such as cleaning gutters and replacing damaged shingles, is crucial for extending the life of any roof.