Roofing felt has come on leaps and bounds since its inception in 19th Century California, where it was used as a low-cost waterproofing solution. Roofing felt is generally composed of two primary elements, known as the base and the carrier.
The base is usually made from either natural or synthetic materials such as cellulose fibres or fibreglass, which is then saturated in waterproof bitumen known as the “carrier”. The carrier is what lends roof felt its weatherproof properties along with its ability to breathe effectively.