"Perforated PVC tiles are ideal for roof tops and decks, and pool surrounds. The soft underside will not damage rubber roofing material. With a 1/4"" hole, the perforations allow water to flow through. This tile is also excellent for wet areas. - Perforated Floor Tile, Pool surrounds, decks , rooftops, outdoor walkways, patios, greenhouses - Perforated Tile"