Coop on patio?

[PhoebeD]

We're building a coop in Brooklyn (rats!, raccoons, cats) and considering putting it on a part of the yard that has brick-shaped paving stones so that any rats would not be able to burrow underneath. Is this a bad idea? Would it be too moist? Our thought is a tractor-type coop that we could move, clean underneath, and put back. Do they need to be on dirt?

 

[chews chooks]

no it doesnt matter what you put it on and if anything putting it on concreet or any solid ground like that makes it easier to clean out