Can an existing asphalt shingle roof be covered with another?
A roofing contractor may be able to apply the new material directly on top of the old layer, depending on its condition. Although this saves a little bit of time and money, experts strongly recommend against it, especially in hail- or wind-prone regions. Hail tends to cause more damage when there is more than one layer of shingles. In windy areas, the new layer will not grab as tightly as it should if there is a pre-existing layer under it. Any other type of roof covering is typically removed before the new roof covering is installed. Can composition shingle roofs be repaired? Yes. If damage is minor, a roofing contractor can remove individual shingles and replace them. Cant I just do the work myself? Only if you have sufficient experience in replacing roof coverings. Otherwise, dont try it. Most roofing jobs are not for the do-it-yourselfer. Novices can do more harm than good if they use improper roofing techniques. More importantly, they can severely injure themselves by falling off
