Is it possible - two Z-wave networks in a house?

All:

I'm thinking about using a second z-wave network to control just a few 'critical' switches that I can still control in case of a catastrophic failure (server, power or network). Does anyone know if two independent z-wave networks can coexist in the same radio space? I don't want to try it based on the concern of interference the 2nd z-wave network could have on the first.


Thanks