What is the best grout to use in cold climate freeze/thaw locations?
Travertine needs to be able to expand and contract in freeze/ thaw climates. The best option is to use a flexible mortar (such as Flex-Bond) on the pool coping and around the edges of your project, or anywhere that you would normally use traditional mortar
If you are going to be mud-setting the pavers, it is recommended to use Flex-Bond (or similar) adhesive instead of traditional cement products to prevent cracking during the freeze/thaw cycle.