I’m having my 1.25” thick travertine pavers installed on a dry set base. The PB is planning to use spacers and then fill joints with polymeric sand. The pavers are pretty smooth on the sides, so I would think they would fit tightly together without having to add the spacers and the polymeric sand. Thoughts whether to go with the PB’s plan or without the spacers and polymeric sand? Pros and cons? What are others’ experiences/preferences? I want a durable pool deck that will last for decades. I live in Virginia, so we do get some frost/thaw moments. Thanks.