It depends on the age and condition of your existing roof. If you have a
wood shake roof the answer is most definitely yes. If you have asphalt
shingles and they still have half of their life remaining I would say you
are fine installing a solar PV system on it. However, it would not be
wise to install a PV system on a roof that has only 5 years or so of life
remaining. In that case we would suggest a shingle replacement at the
same time the Photovoltaic installation was to occur.