Question: how do you know when you need to replace roof?
Answer: Asphalt roofing shingles with curled edges. ... , Cracked asphalt roofing shingles., Visible signs of aging on a 3-tab asphalt shingle roof., 3-tab asphalt roofing shingles with algae/dark stains., Moss growing on asphalt roofing shingles.