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We don't use paver restraint as a guide for screeding. We use 1" EMT conduit (sounds like you do, too). Because we use a compactable bedding layer (stone screenings), we still compact even after we lay our pipe.
So after we lay pipe, we usually screed, then compact, 3 - 5 times before we pull the pipe, fill in the pipe lines and begin laying pavers.
Don't worry about not knowing all the answers - that's why this site was built in the first place. None of us have all the answers individually, but collectively I don't think there aren't very many things we can't figure out.
And I applaud your using the internet for your research in a non-native language. With all of the typos I have in my posts, I'm amazed that people who grew up speaking English understand me. (And I helped set up the Spanish speaking department at a local insurance company, so I understand how hard this kind of research can be.) It takes guts to make a go of it, even when you speak the language fluently.
I look forward to lots of questions, and will do what I can to provide as much info as I can.
Good luck,
Jeff
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