Final answer:
It is true that most asphalt shingles can be used on roof slopes from 4:12 to 21:12 with standard application methods, as this slope range helps ensure proper water drainage and complies with many building codes.
Step-by-step explanation:
It is true that most asphalt shingles may be used on roof slopes ranging from 4:12 to 21:12 using standard application methods. This range is acceptable for ensuring proper water drainage and preventing water infiltration. Roofs with a slope less than 4:12 require special installation techniques to prevent leaks, while roofs that are steeper than 21:12 may also need additional considerations for secure attachment and to avoid shingle damage When installing asphalt shingles on a roof, it's important to follow the manufacturer's instructions and building codes which often specify suitable slopes for installation. Using the correct application methods for the slope of the roof is crucial for the long-term durability and effectiveness of the roofing system.