An old, curved terracotta tile roof completely covered in thick, vibrant green moss. In the unforgiving weather conditions of New Jersey, your roof becomes a battleground for dirt, debris, moss, and algae. These growths thrive in the region’s humid climate, trapping moisture that leads to rot, warping, and shingle deterioration. According to experts, moss on a roof is damaging because it traps moisture against asphalt shingles, causes them to lose protective granules, and wea