In order to block out E.M.F's ken suggested simply grounding the metal lathe that surrounds the whole house. The lathe is installed for receiving the layers of stucco but will now serve a dual purpose.
The idea is to create a living space that is completely grounded. Below is an image of how a grounded cage can protect a human from direct electric current or in our case harmful electro magnetics in the atmosphere such a wi fi waves.
There will also be a grounding floor in the house for health purposes to learn more on the benefits of earthing visit the Facebook page Earthing Japan!