Thanks Dave and Kurt, I'll get a picture posted today. The pool is currently covered and winterized, but this is a good reason to get the cover off early. Actually was planing on doing it this week anyway. I'm fairly certain that I could penetrate the caulking , or grout, with a finger nail last season, but I could be wrong. The joint being grouted just makes more sense. Look for a new posting and confirmation if it's caulking or grout today. Thanks again. Scott