I am wondering if I should use Polymeric sand or self-leveling sealant on expansion joint. I have travertine pavers going down on a dry set base. Pool PM says it doesn’t matter as long as there is a 3/8-½ inch expansion joint there. The deck builders say they often use polymeric sand between the pool beam and deck pavers. I heard that self-leveling sealant with a backer rod may be better from someone. What are you guys thoughts about this? Which is better, polymeric sand, sealant/backer rod, or nothing at all? Also, considering the ease of reinstalling ( if necessary) in several years. Thanks!!