My hens are in half of my brick garage, with a concrete floor, with redundant galvanised dog run panels for their runs inside and out with a pop hole between, one side for hens, the other side hoping to have more ducks this year. Netting over the top inside and out to deter Foxy.
I lay pieces (about a square metre) of old tarp on the floor, overlapping it, and cover it with a light layer of chopped straw. Pull the bits of tarp out(lighter weight than Lino which I used to use), shovel the chicken poo and straw mix into a wheel barrow ready for composting, hose down tarps, mop the floor with poultry disinfectant, remove wooden perches and spray with mitekill. Seems to work.