Jeff, I've seen so many problems with travertine inside properties. From cracking to pitting badly. It seems to be a very porous stone.
I'm with you, I wouldn't use kool deck either. It looks cheap and needs repainted all the time.
Are pavers really that much hotter than travertine? Do what I did with the roof tiles I'm putting on my new home. Lay them out in the sun and put a temp gun on them and see if it's really an issue. I'd at least look at some other natural options.
The custom house I sold was a maintenance nightmare so I tend to stray away from anything that I know will cost me money and headaches these days in favor of sustainable materials and landscaping.
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Todd
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