Asphaltic membrane was placed on the rooftop, it was removed to give it a greater slope, they did not remove it all, on it they placed lime mortar, portland and sand for the slope and then a new asphalt membrane. As I took out the entire membrane, part of the material of the slope also left and remains of the old and new membrane remained. I'm going to redo the slope, my question is: the material I placed (sand and cement - 3x1) adheres on the remains of the asphalt membrane? Best regards pepe chipulu

Hi. With a grinder and a conical braided brush you will remove the vast majority of the membrane. regards