Travertine Tile for Pool Decking
Answer: You can lay either tiles (3/8" thick and 1/2" thick) or pavers (1.25" thick) over the existing concrete. Tiles will work, but pavers would be ideal for longevity and functionality reasons.
You can find detailed information about travertine tile and travertine paver installation here:
http://www.travertinemart.com/travertine-installation