Thank you! The only issue, since the rain, is that the inside of the coop floor is now damp from water seeping up through the ground. Almost wondering if we should have put a concrete floor in instead of having it sand & dirt. We're now planning to add rain gutters - lol!
If you have a wood flooring inside the coop, you might be able to jack the coop up using a couple of floor jacks, start with the rear of the coop first, then the front. Slip pressure treated 4x4's under for support, like a shed has.
Then you'll have airflow under the shed to help keep the floor dry.
If you dont have a wooden floor, add alot of sand, or you'll have to go with your cement plan. Or maybe you could still jack it up and place 4x4's under it and then add plywood flooring.
Gutters work. I have one gutter for each of my 2 coops/pens and they divert rainwater away from the pens/coops via 4" corrugated hose out into the yard.
We have flooding rains here all the time and the backyard floods temporarily. The pens never flood due to the gutters and because I've filled the pens with truckloads of sand. The amount of sand in the pens is actually higher in elevation than the rest of the yard.
The sand doesnt wash away like dirt/mud. However over time, the hard rains beat the sand down into the soil. Then it's time to refresh the pens with sand, when it's not raining.
It takes approximately 2 cubic yards of sand to refresh my pens, a total of 25'x25', $25 per cubic yard.
Due to the extreme hard rains almost every day for 3 months earlier this year, I had a dump truck deliver 5 cubic yards of sand to our house. I had a neighbor help me load it up and haul to the back yard. It took a week for us to complete the job because it started raining again the next day.
Good luck with what you decide to do.