You can do it. I’ve had to do it for several large computer facilities, the kind that allow no external connections whatsoever. Even the electri power was cleaned before entering. Imagine a Farraday cage 400’x 400’x 66’. Takes a lot of copper mesh. Luckily we got to do this as part of ghe construction effort not as retrofit. The leak checking was interesting.
I see a business opportunity... Faraday house siding, and Faraday paint. :)