From:
"Walter S. Arnold" <walter@zzzzzzzzzzzzzzz>
Date:
Wed, 26 Apr 2006 21:59:58 -0500
Subject:
simple serpentine question
At 09:53 PM 4/26/2006, George Graham wrote:
Quoted text begins.I saw some serpentine cladding that's outside an entryway that has the
worst case of weathering I've ever seen. Some areas look like a sandblaster
was used to remove 1\4 to 3\8".
End of quote.
I see that a lot with old colored marble used in exterior
applications in Chicago. We get pretty extreme freeze/thaw cycles in
the winter, and it's hard on most materials. (wind can blow snow/ice
into the stone each night, then the sun warms and melts it in the
afternoon, and that moisture soaks in and freezes again that night...
many times over)
Each color in colored marble represents different mineral
compositions, different hardness, etc.; so some veins will be softer
or more porous, or more brittle, and therefore more susceptible to
the ravages of weather.
You'll see similar effects in the floors in old cathedrals- some
pavers will have veins of heavy wear that have half a centimeter worn
away, while other veins stay near the original height.
Walter S. Arnold * walter@---------------
Gallery: http://www.stonecarver.com
Gargoyle postcards: http://www.stonecarver.com/postcard.html
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