This section examines properties of metals roofs and provides a comparison to other roofing products. In addition, several myths about metal roofs are dispelled. Typical installed weights range from 1.25 to 1.75 lbs. By contrast, heavy shake can weigh a few psf or more when wet. Clay and concrete tiles can weigh as much as 10 psf, requiring super sub-structures to support this added mass.
Lightweight metal helps to reduce worker fatigue since heavy lifting is significantly reduced.
The lightweight metal roof significantly reduces the chances of catastrophic failure or collapse of the roof structure during a massive quake. Since metal is non-combustible, it will not burn or support the spread of fire. During an internal fire, a heavy roof could experience premature collapse as the internal support members give way. A wood roof generally accelerates the spread of fire, as the wood provides increased dry fuel for the fire itself. A metal roof can help to preserve the integrity of the roof structure long enough to ensure a safe escape.