A skylight is defined by what characteristic angle of slope?

A skylight is typically characterized by its angle of slope, which must be greater than 15 degrees. This standard is important because a slope steeper than 15 degrees helps ensure proper drainage of water, thus reducing the likelihood of water accumulation, which can lead to leaks or other structural issues. Skylights installed at these angles also facilitate better performance concerning solar gain and reducing glare from direct sunlight.

Independent of the other choices, defining a skylight with a slope less than or equal to 15 degrees does not align with the construction and design principles that emphasize the need for adequate drainage and weather resistance, which are critical in maintaining the integrity and functionality of the skylight over time.