A wind storm caused several tiles(maybe 25) to come loose. These files were part of a cover put on the original roof. If I owned a one story house, I'd do it myself. But it's 2 and 1/2 stories up. A roofing company estimator says they can't do the job because the tiles will just come loose again. I did not think to ask him why. I'm wondering why, if these could be nailed on with as a cover why can't they be renailed now. He said only 4 inch nails would hold them in securely. Why might this be. Is it possible the wood underneath is rotted or is this maybe a common scare trick used to get us to put a whole new partial roof on, as he suggests?