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Roofing felt is a fiberglass or polyester fleece impregnated with bituminous impregnating agents (tar, asphaltic bitumen); it is produced in roll form. In some cases mineral materials (e.g. sand) is applied to one side in order to help prevent the material from sticking together while in roll form and to provide protection from atmospheric conditions. A distinction is drawn between tarred board and bitumen board.
Intended use
Roofing felt is used, among other things, for waterproofing roofs to prevent ingress of moisture.
It can be installed in several ways including but not limited to: mechanical fasteners, hot asphalt, cold asphalt (adhesive), non-asphaltic adhesives, and heat (torch, hot air) or a combination of the afore mentioned.
More Information in
- http://www.tis-gdv.de/tis_e/ware/papier/dachpapp/dachpapp.htm
"Roofing felt"