On top of pressure treated deck
Great product! We needed to find a product that would help our deck that was peeling and cracking from a previous product. These tiles look amazing and were very easy to install. I am anxious to see how they hold up in the New York winters. All reviews that I read said that they will be fine. We used the beige on the top 24x24 deck and the gray on the lower 14x14 deck. Highly recommend.