Can this turf be placed over compacted gravel? Or should I install 4" of compacted road base? I can imagine that it might be hard to install 6" nails into the compacted gravel. would I run into other problems? What about installing it over sand. Sand compacts to 100%. But will the turf stay in place over the sand?

We recommend installing our Pet Turf Rolls over compacted crushed granite. We recommend this due to the great drainage properties this material has versus others. You can install our Pet Turf over any hard flat surface such as compacted gravel. You would still want to follow the recommended install steps for securing and ensuring that your turf lasts for years to come.