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There's roof safety anchor systems which are designed for residential roofs. Look for something like the Ridgepro anchor: https://www.theridgepro.com/

It does seem best when using lag bolts to secure such an anchor to the roof but even when not screwed to the roof should provide some level of fall safety.

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Are these used in practice? In what regions? In Seattle suburbs, I've never seen a crew wearing any kind of attached harness.

They should be, but I also rarely see roofers in harnesses around here on the other side of the country. It's one thing when it's a roofer himself making the (stupid) decision, but a lot of the guys I see actually on the roofs are non-English-speaking laborers basically told to get the job done and not ask questions.

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