We use it in the shed coop with a metal roof that isn't watertight. It does a great job soaking up the drips.
We put down a lot more than you have there though, and it lasts a very long time. (3-6 months). Once the layer is thick enough, it's easy to walk on, but a shallow layer is hazardous as the pellets roll underfoot.
When I worked at a horse farm that used it, they insisted on a shallow layer that was misted... but I think that kinda wastes its chief benefit which is absorption capability. Pulling the moisture out of the poo keeps the smell down.
Do be careful to keep it away from plants you want to live. I've used it to make paths no weeds will come up through. Either the pine oil or the absorption of nitrogen...