Abstract: A flexible, non-skid roof underlayment is provided which is formed from a spunbond nonwoven layer of continuous multiple component filaments and a coating on at least one surface of the spunbond nonwoven layer. The spunbond filaments are preferably formed in a sheath-core configuration with a high strength component in the core and a sheath component having high adhesion to the coating. The roof underlayment has an improved combination of high tensile strength and high coefficient of friction.