You can use our Raised Grip-Loc Tiles outdoors on a tar rooftop as these are made from EVA, which is a softer plastic and will not damage the roofing surface. These tiles are not UV stable and have the potential to fade over time. Also, since they are made from a softer plastic, they will expand and contract a greater rate than our harder plastic tiles. Other than that, these tiles would work excellently and are very easy to clean and maintain. Also, they are more comfortable underfoot than our hard plastic tiles.