As the name implies, a skylight is a covered, transparent opening (i.e., a window) in a roof that allows natural light from the sun to illuminate an interior space in your house while allowing privacy. They are very useful for brightening dark hallways, bathrooms,...

If you go outside and look closely at your roof, you likely will see several sections of your roof joining one another at angles. These intersecting planes form a V shape, and since the slope is downward, in heavy rain, a good deal of water flows along the bottom of...