Don't use sawdust! You can get bales of "pine wood shavings" at your local feed store...Sawdust packs down and will retain moisture...just FYI!!
The sawdust I use is a finer version then them lil bales from the feed store.
I work at the feed store and I even get a discount and still dont buy them. My dust comes from a horse boarding facility that gets it by the semi load. I pay $7 per 65lb bag. I have no moisture in my coop and it works best for me.
Again this is my opinion and what works for me, it might not for the next person.
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