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Roll roofs don’t last as long as traditional roofs, like those made of asphalt shingles. A roll roof typically lasts between five and 15 years, whereas a shingled roof will last between 20 and 50  years. Modified bitumen roofs are similar in look to rolled roofing but have a 12 to 15 year warranty.

No, a metal roof will not make your house hot. In fact, metal roofs help keep your home cooler by reflecting heat instead of absorbing and transmitting it inside. Metal also has high thermal conductivity, which means it gains and loses heat quickly. While the sun may heat the metal, the roof rapidly transfers that heat back into the air rather than retaining it. This reflective property can lead to energy cost savings of up to 40%, as your cooling system won't need to work as hard to maintain a consistent indoor temperature.

While there are many benefits to installing a metal roof on your home, there are some downsides, too. Zinc roofs, in particular, are susceptible to corrosion from overly salty air directly near coastal areas. Another potential downside of zinc roofing is that it must be allowed to expand and contract with the weather. This means special attention is necessary to how it's fastened to the home to avoid issues. 

A spray foam roof costs an average of $6,000 to install, making it one of the most affordable flat roofing options available. Costs can increase if you have a complex roof design with many roof vents or have a roof that’s larger than average. While up-front costs are relatively low, keep in mind that ongoing maintenance and repairs tend to be more expensive than you’d see with other flat roof materials.