That would be a major undertaking as the concrete is extreemly stong here....
I tried to mount a CRT PJ on the ceiling (i was succesfull in the end LOL) but i made a lot of holes..... This because my drills all melted by doing so....
The only other solution I had in mind - if you had a new floated wood floor with that underlay - you can get the military style EMI/RFI mesh by the metre. You could roll it out under the underlay - super thin. You then electrically ground it. It is used in military control rooms etc.
Shielding solutions against high frequency fields and electric fields. We provide shielding fleece and tissues gainst every RF interference. Shielding efficiency up to 110dB.
Yes, placing a grounded metal grid of some kind will eliminate a lot of noise (also good for all your friends with enoying sounds coming out of their mobile phones whenever they receive a message LOL)...
Ferrite is used in medical environments etc. as RF shielding...
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