Stupid computer!
First what type of treated lumber is it CCA, ACQ, CBA-A, CB-B, SBX?
I doubt its CCA since its production was halted in December of 2003 for consumer use it is now only available fo industrial highway and agricultural applications.
Most likely it is AC2 or ACQ, Alkaline Copper Quaternary, which is safe and doesn't leach harsh chemicals like the arsenic and chromium found in CCA. Which was mass produced for nearly 3 decades and about 90% of all treated wood produced before 2003 contains CCA.
If it was me and I had ACQ or AC2 I would not worry about useing the product within the cage or even as shelving. However I would not use any CCA product as shelving as it can cause cancer, it has created quite a controversy in the EPA.
Good Luck
-----
Jeremy
"I am become death, the destroyer of worlds" July 16, 1945 Robert Oppenheimer
1.1 Double Het "Sharp" Snow RTB's
1.1 Hypomelenistic RTB's
0.2 Pastel Hypo RTB's
2.0 Double Het Stripe Albino RTB's
0.1 Suriname RTB
0.1 Anerthrystic RTB
0.0.11 Red Bearded Dragons
1.1 Rhinoceros Iguana's
1.0 Green Iguana
1.0 Ball Python
1.1 Cream Golden Retrieviers
1.0 Pomeriaian
0.2 Catus Terribilis
0.1 Spouse
0.0.1 Youth -coming soon-