How to make a room into a Faraday cage during construction?

It all comes down to what you are trying to protect against, and what you are protecting. Aluminum foil will work as to some EM fields, but not others. Fine mesh copper will do the sAme. read more

The room need not necessarily be grounded, but I would do so as you're doing construction anyway. No water pipes in the room either. A Faraday cage is an electro exclusion room so any break, tear or gaps will allow some transmission to enter, it will just depend on the size of the opening. read more

A microwave oven is an example of an inside out Faraday cage, keeping the RF energy within the cage rather than keeping it out. [3] Elevators and other rooms with metallic conducting frames famously simulate a Faraday cage effect, leading to a loss of signal and "dead zones" for users of cellular phones, radios, and other electronic devices that require electromagnetic external signals. read more