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Eroding Limestone


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I've seen this before in local buildings. The stone looks like it is between limestone and sandstone. Often, I see fossils at the fault lines which probably contribute to ice lenses forming and popping the face off the stone. The  "sugaring" is from saturated porous material freezing.

Kibbel would know if there's a repair, but you should at least slow down the erosion with a permeable water repellant. I suggest you call these folks and ask their advice. I'd be inclined to use the silane/ siloxane repellant.

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