Hey yall! We are pouring our stamped concrete pool patio next week and am looking for advise on how to butt the concrete up to the back of the Paver Coping. Should i add the expansion joints below between the coping & concrete? I'm pretty confident i need something between the two in order for the concrete to expand/contract without pushing and pulling on the coping, i'm just not sure how to make that happen. Thank you all!