Chimney caps help protect your roof and home from any burning embers that could escape and potentially start a fire. Though there is a variety of structural designs, all chimney caps serve these same functions, no matter if your chimney is prefabricated or constructed of masonry. Typically, the piece is shaped in such a way that it resembles a little roof over some caging that fits right inside the very top of the flue. The caging provides the perfect escape route for the exhaust fumes and noxious gases created during combustion, while the roof not only prohibits any unwanted intrusions, but also redirects any water out and away from the flue – partnership at its finest!