What is true about asphalt shingles on low-slope or flat roofs?

Asphalt shingles can indeed be used on low-slope or flat roofs, provided they are properly installed. This is important because asphalt shingles are primarily designed for steep-slope applications where water can easily drain off. On low-slope or flat roofs, the water tends to stand longer, which can lead to potential issues like leaks if the installation is not done correctly.

When installed properly, asphalt shingles can still offer acceptable performance on low-slope roofs with the right techniques, such as using special underlayment, sealing the seams, and ensuring proper drainage. This means that even though they are not the optimal choice for flat roofs, they are not completely unsuitable as long as proper installation practices are followed to enhance their performance and longevity.

The other options suggest extremes or incorrect ideas; for example, stating that asphalt shingles are never recommended overlooks the possibility of their successful use with the proper precautions. In contrast, they do not universally enhance aesthetic appeal as this is subjective and depends on the overall design of the roof and the preferences of the homeowner.