How long will travertine pavers last in a region with acid rain and acid fog (e.g. Los Angeles) before they start pitting and deteriorating?
No, I do not believe we can quantify this for you. You may get lucky and have someone from L.A. answer you who's actually documented their Travertine degradation from CA polution and Acid Rain, but I wouldn't have my hopes up.
It seems a grave enough concern that perhaps you should forego any material susceptible to such problems. Maybe brick pavers or Quartzite would be a better alternative for you. With your level of concern, I would only suggest the most durable of material choices you can incorporate into your design.
Travertine has been around and used for outdoor use forever. The travertine will most likely outlast you.
Yeah.. like the Roman Colosseum, built with Travertine.
You might not see a lot of travertine perhaps because the stone is not readily available in the LA area. Travertine comes from ancient calcium carbonate deposits from surface waters and hot springs. CA is not known for producing travertine. Rocks are heavy and expensive to transport therefore it is likely cost prohibitive except for the uber-rich (think Hearst Castle) to install natural travertine. I sincerely doubt acid rain has much to do with the considerations.
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Here is a Travertine supplier in the LA area, FBR Marble 562-602-2300 Hope this helps you.