Use the inexpensive concrete paver blocks, also called cap blocks or scrounge some bricks from remodel jobs or houses being demolished. That way you can lay in floor as you get them and it's easier on the pocketbook.
I laid cement boards down on top of sand, then built my coop right on top. I like it a lot and feel totally secure, it is also easy to keep dry and clean. If there is some way to pry the coop up, I would try to get the edges under the building, Otherwise just get the thick stuff and cut it to fit.
BTW--I take the feeder out of the run now at night, plugged up the holes, and haven't seen any sign of the rats since. I'm sure they are still around, but at least they are not getting to the chickens. I can only hope the coyotes will get them.
Not even sure if this would work, is it possible to get bricks or blocks and break them or cover the coop floor with them, then get a few bags of quick set cement and spread on top to seal them. Liek I said not sure but I would probably try it.
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instead of prying up the coop, can you just run a 2x4 around the perimeter ? set it tight to the cement board and nail it to the wall..
that other sugestion about the quick set concrete... I would not mess around with quick set for a floor.. if you are going that route, get yourself a drywall mixer that fits into a 1/2" drill chuck,, they cost about $12.oo,,,,,
mix ready mix bags one at a time in a 5 gallon bucket and dump them out and level them as you go.. do not make it less than 2" thick. It only takes about a minute to mix a batch this way..
do not make the batch too soupy.
add water first to the bucket, then 1/2 of the bag , mix , then add the rest of the bag gradually..
you will have to use a heavy drill for this type of project..