Torch Down roof is one of the beautiful looking roofs, so it has to be constructed by a trained person, to maintain its strength. Although it is similar to built-up roofing, this type consists of fiberglass layers and polyester. Bitumen is also added to the tar and gravel roofing. These overlapping sheets are made to torch down during the installation process. In present day, self-adhering modified sheet of bitumen are used, this fills the gaps and repairs leaks without any leaks.