Short Answer: None. The treatment restores your shingles to near their original installation weight by replacing lost oils.
Detailed Answer: From the day your roof was installed, the shingles have been slowly losing their natural petrochemical oils within the asphalt. This means the weight of shingles on an older roof is actually less than the day it was installed, although this difference is very small. Our treatment replaces these lost oils with an all-natural oil. By restoring these oils, we’re simply adding back the weight that was lost over time, essentially making the shingles weigh near the same as the day your roof was originally installed. The net result is no additional weight beyond what your roof was designed to support.