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This will depend on your existing roof to some degree but it’s common to raise a roof 4 to 8 feet. The exact amount you can raise is subject to the existing structure and for most homes with average roof slopes—20 to 45 degrees—you can raise the roof around 5 feet.

You’re going to need a permit for nearly every roof-raising project. This is a very important step as the work you’re doing has serious safety considerations. Professionals are the ones to handle this type of work—including sourcing the permits—as they have the expertise required to perform the work safely. Insurance and warranty are usually voided if you do this work without a permit and you may even be required to halt construction and tear it down as a penalty for working without a building permit.

Gable roof construction can last for 100 years or more without needing structural repairs, although the lifespan depends on your climate. Since gable roofs are great at shedding rain and snow, the actual roofing material on top will last for between 20 and 100 years or more, depending on the material you choose. If you’re unsure that your gable roof is up to par, have a roof inspector take a look.

There’s no single best roofing material for flat roofs, but EPDM is considered an excellent option because it lasts longer than TPO roofing and built-up roofing, and it’s the most adaptive to extreme temperatures and variations in temperature. EPDM can also be highly energy-efficient at both ends of the climate spectrum, with black EPDM helping to reduce heating bills and white EPDM helping to keep your building cool in extreme summer temperatures.