Rules for an actually-functional Faraday Cage

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Hello,

I am, for reasons all my own, interested in constructing a room-size faraday cage.

I have seen many “faraday cages” for sale online, that noticeably only cover five sides, and I have learned that this will make it functionally useless.

What other tips are there for constructing a faraday cage, aside from “make sure all sides are covered” and “have no holes” and “make sure the interior in conductively insulated from the metal exterior”?

Thanks!