A non-skid underlayment for a roofing assembly for covering a roof deck and for facilitating the positioning of subsequent underlayments, the underlayments produced from a water-impermeable sheet imprinted on its top surface with one or more non-cylindrical designs in the shape of a closed figure or a polygon forming vertical and horizontal rows, and are inset from the marginal areas to allow positioning of the underlayments in abutting relationship to each other and to provide a visual means to an installer where the non-skid areas are ion the underlayment; an adhesive is coated on the underside of the underlayment for adhering the underlayment to the roof deck.