A pool deck is replaced far more often than the pool inside it, and the replacement has to be built to the shell that is already there. The bond beam around the top of that shell does not move. The deck around it sits on whatever was shoveled back against the shell the year the pool was dug, and that is what moves. So the new deck is poured as its own slab, separated from the coping by a joint that can flex, on fill that has been dug out and compacted before a form board goes in.
Plaza Orange Concrete was opened in 2018 by Curtis Ballard, after 18 years on central Orange County crews, and he stands at the coping for every deck pour. Most of them show one picture. The shell went in with the tract in the 1960s or 1970s, and the surround was poured thin, tied to nothing, and sprayed with a textured topping every ten years to hide the settlement. By the time we are called the topping is coming off in sheets and the slab has tipped toward the water.
The work is done under a CSLB C-8 concrete license with liability insurance on every job. A deck around an existing pool is a question for Building and Safety Services, because the answer changes once the job touches the pool's bonding, its barrier or the pipes beneath it. We ask through the Civic Portal before the estimate is written, so the permit position is on the sheet, and the deck carries a written workmanship guarantee against defects in how it was built.