I;M IN THE PROSESS OF BUILDING A COOP. I HAVE AN OLD AREA MADE OF CEMENT.I THOUGHT I WOULD PUT THE COOP ON THE CEMENT. THE COOP IS 4X8. THE CEMENT WOULD BE THE RUN IT WOULD BE 12X18 FEET.I HAVE 8 CHICKENS.WOULD ANYONE KNOW IF THAT WOULD GIVE THEM ENOUGH ROOM I ALSO WONDERING IF MYBE A BAD IDEA TO USE CEMENT. THE CHICKENS WOULD BE FREE RANGING MOST OF THE DAY IN THE GRASSY YARD.HAS ANYONE EVER USED CEMENT FOR A CHICKEN RUN?