What about a layer of cardboard? You'd still have the waterproofing underneath, and they'd be less likely to shred the cardboard than they would if you use newspaper under the shavings. Your comments are making me re-think my plan. I have laminate flooring that I need to install this week, may need the cardboard over it.I have a lino floor in my brooder. I put about a 3 inch thick pine shaving layer down each time I clean and it keeps them from sliding. About the time I have to replace the shavings is about the time they just start to slide around. I replace the shavings and they're good to go for a few more days.
The chicks are just over 3 weeks old now. Maybe in another week or so I may have to look into adding some sand to the mix.
-darrell