Buy pallet racking and wire decking that has the "R-Mark" and has been designed and manufactured to the Rack Manufacturers Instit ute specifications.
Contact your local building officials to find out what they require. They may require that you pull a permit. Follow all building codes and seismic requirements.
Is it okay to mix rack types? You must check with both manufacturers to verify pallet rack dimensions before you can insure compatibility. Mixing rack can lead to potential problems. Even 1/4" difference in beam length can prevent beams from being compatible with existing rack when trying to fit into existing rack row. Even upright frame widths can vary and prevent you from replacing uprights in existing row. When in doubt, don't mix.