On ten feet? 10 feet? Well, there is a cause.. must be something irritating their feet, repeatedly, constantly... is the roost rough, has it got splinters or rough spots on it? Do you need to sand it down to smooth it out?
Or is there something else they are walking on or roosting on that is irritating their feet? Is it only hens, or do the roosters have it, too? If it is only hens, what is in their nesting boxes?
Well... do a Search here on BYC: "Causes for Bumblefoot"... and even just "Bumblefoot" to make sure if that is what is going on?
There would be swelling and pain, limping with Bumblefoot.
I don't know enough to help you, sorry. I can only suggest you use the Search here to check on symptoms and causes.
Good luck.