I thought copper mesh was used for this purpose.
Yes, you can construct a Faraday cage out of copper mesh or even steel plates.
However, it is difficult to construct a cage of any significant size that doesn't have any "leaks". And, electrical cables, network cables, and even water pipes have to be filtered so they don't conduct radio frequencies.
What's different about this is it's as simple to deploy as wallpaper. It would be interesting to find out if it is easy to seal "gaps".