- Q.Is it true that the steeper
a roof is, the longer it will last?
A.Yes, the steeper the
roof, the longer the roofing material will last.
Because water runs off the roof more easily, the
roof covering will dry faster. And during the
hottest part of the year when the sun is higher
overhead, a steeper roof will absorb less solar
radiation than a flatter roof. There are limits,
however, since some materials will not be heavy
enough or the adhesive strong enough to hold the
roofing material on very steep roofs, such as those
greater than 20/12. Fortunately, not a lot of
designs call for such slopes.