We have been asked to strip, clean and seal an old residential interior slate floor.  We have done this kind of thing before and it appears somewhat straight forward assuming we can test to figure out what gets the gook off the best.  Problem is that there is water damage around the edges that has created delamination on some of the stones.  How do you all deal with this kind of issue?  I have warned the owners that this problem may not go away if there is constant water migration underneath the stone.  Hard to say if this is recurring thing.  it looks like the wood floor in the next room are warped from a flood of some kind, but at least part of the floor is adjacent to an exterior wall.  It is sort of a sun room.  I posted some pix.

Thanks for any advice.

Baird