Question: what is the difference between a 20 year and 30 year roof?
Answer: The larger your roof, the larger difference there will be between the 20-year shingles and the 30-year. The 3-tab, or 20-year shingles look flat because of the way they lay. Choosing architectural or 30-year shingles will give your roof more dimension. The shadow line is what gives the appearance of depth.