I have a backyard above wood deck and I was wondering if I could put your Tough Mats over it. If yes and what kind should I use to keep it in place?

You can insall our 1/4" 4' x 10' Tough Mats on an outdoor wood deck. These mats are very durable and can withstand the elements. Our rubber flooring is very slip-resistant and even more when wet. These rubber mats are also mold and mildew resistant. To keep the mats in place outdoors, we would recommend gluing them if you want a more permanent hold. You would use a polyurethane adhesive for this. If you are looking for a more temporary hold, you can use our double-sided tape.