Remove surface finishes and abrade flooring surfaces to ensure adhesion. Grout lines must be filled and flush with flooring material surface. Ceramic or other surfaces may require the use of a primer to ensure proper adhesion. Slate and brick surfaces may be too rough and uneven for most installations and may require the use of a self-leveler or smoothing before installing carpet. Attention must be given to the “open time” requirements of the adhesive manufacturer when adhering carpet to these surfaces.