So I am building my first pool(40,000gal freeform).... I dug the hole, I did the plumbing, I did the rebar, I hired out the Shotcrete, I installed 150 tons of rocks, I installed the slide and two waterfalls, I installed the 2” bullnose travertine coping, I installed the pool tile, I built the pool shed, built the outdoor kitchen/swim-up bar, ran the gas lines, I hired out the electrical, I installed all the pool equipment, I hired out the plaster. I filled the pool, and am now working on the pool deck (1 1/8” travertine over the top of concrete) and have run into a dilemma......because the 12” coping sits on top of the 12” concrete pool beam and overhangs it, it leaves a 2” gap from the back of the pool beam to the back of the 2” coping. My 4” concrete slab butts up to the back of the pool beam with a 1/2” fiber expansion joint. When I go to install the 1 1/8” travertine decking, I don’t know how to properly provide an expansion joint in the travertine. Can anyone tell me what is typically done here? Do I need to provide a sketch of my issue? Any help is greatly appreciated!