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Its about 14 years old, the dip is from day one, just bad construction. Its a 20x20 corner of a rectangular house, under the roof. Exactly same area, below is the "basement" area porch. Pressure treated ply, over joists, 1/2" cement board. Only the homeowner and kids use it. Wife is a bit ADD...

Been asked to repair a black/grey slate, under a covered patio. The slate has a layer of "clay" on the surface, very easy to scrape off with a fingernail. I suspect it was never sealed. It makes "mud" when wet. Is it possible the acid wash maybe, and clean then seal? or is there a better option...