In the middle of a pool build. Just had my deck poured and noticed this embedded trim. I have a few pieces butted up next to each other and then several other places with varying gaps up to 1/4 inch space. Any thoughts? and what is the purpose of these pieces. Are they permanent? I'm starting to fall out of love with my poolbuilder of late and looking for some opinions as I feel I am starting to get the run around with varying issues. Thanks.