40 Hour Property and Building Inspection Practice Test

Which type of skylight is generally more effective?

1. A skylight mounted on a curb

2. A skylight mounted directly on the roof

3. A domed skylight

4. A flat skylight

The correct answer is: A skylight mounted on a curb

A skylight mounted on a curb is generally more effective due to its design features that enhance performance. Curb-mounted skylights are elevated on a frame or curb that raises them above the roofing material. This elevation allows for better water drainage and helps prevent water pooling around the skylight, which can lead to leaks and water damage over time. Additionally, the curb design accommodates the natural slope of the roof, aiding in the overall drainage of rainwater or snowmelt. Curb-mounted skylights also offer improvements in insulation, as the raised frame can provide space for better insulating materials, reducing heat transfer. In contrast, other types of skylights, such as those mounted directly on the roof, may be more susceptible to water entry because they often lack the same level of drainage features that come with a curb. Although domed and flat skylights have their own advantages, such as aesthetics or ease of installation, they do not typically offer the same level of effectiveness in preventing water-related issues and improving insulation as a curb-mounted design does.