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Shielding EMFs

  Electrosmog shielding

Having monitored the electrosmog
in your home, 
and taken practical
measures to reduce it, you can

further cut your exposure by
‘shielding’ - introducing
a barrier
between EMF sources and ourselves.


Magnetic fields

Electric fields


Dirty electricity


 EMF shielding


Magnetic field shielding is not feasible on the domestic scale. There are metal sheets available, but they are very expensive, and difficult to install successfully, so the best strategy remains detection and avoidance. 

Electric fields are created around high voltage powerlines, electrical appliances, and the electrical wiring of the building. The good news is that they don’t penetrate physical barriers easily, and can be shielded, particularly by grounding them.
          While the structure of a building is generally able to block external sources, they are emitted by internal house wiring, and whole rooms can be bathed in electric fields from walls, floor (from lights in a room below), and ceiling. As electrons buzz back and forth in the wires, (50 times a second, driven by the power station), a similar electron flow is induced on our skin.



Induced body voltage 

        The easiest way to reduce our total daily dose of electric fields, is to be grounded whilst sleeping. This can be achieved with grounded bed sheets - cotton sheets woven with strands of conductive silver, which, when connected to the Earth by a ground wire, provide a sleeping space clear of electric fields. Although we generally think of electricity running down a ground wire to be earthed, it is more accurate to realize that electrons on the Earth’s surface flow up, into our buildings, drawn by the positively charged sky. Mains-power electric fields are extinguished when they encounter the Earths’ field brought into the house.

          Materials for microwave shielding are also conductive, and can be grounded, using crocodile clips and wire. They provide additional electric field shielding for the room when hung on a wall between the house wiring and ourselves.

          Unearthed domestic appliances (with only two wires in the cable) will produce less electric fields if earthed, by running a wire from an exposed metal part of the appliance to the earth pin at the plug. Computers are often un-grounded, with only two wires, live and neutral, in the power supply cable. They can be grounded at a USB port using a grounding cable and plug.  

 Grounded bed
 USB croc to ground

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Grounding in electrosmog

  There are issues around grounding to bear in mind in our modern over-electrified environment:

  • In contacting the Earth we may be exposed to ‘stray voltage’ - mains power currents returning to substations through the ground, due to fault conditions, overloaded neutral cables, or by design. Such stray voltage has been shown to adversely affect cattle in rural USA, for example, and its presence in certain areas of the UK is a possibility. Any such currents need a circuit to flow, however, so they should not flow up cables which do not form part of a circuit. There may also be stray currents in the house grounding wires, but again, these should not travel towards a sheet that are not part of a circuit.
  • A resistor in the grounding cable protects against electric shock, (if you spilled a cup of tea over the toaster in bed for example), although UK buildings have a fuse/trip switch for any such short circuit situations.
  • A person grounded in high EMF environments may attract electric fields to themselves - an ‘antenna effect’. In principle, though, these fields are grounded, and neutralized, upon reaching the Earth-electron skin formed around a grounded person, rather than passing through that person. Still, grounded sheets would ideally cover the whole bed, so that EMFs reach the sheet before the sleeper. 
  • Electric fields are neutralised by grounding, but there is no evidence that magnetic fields are reduced, - these are avoided by not having electric currents (an alarm clock, for example), close to the bed. There is no evidence that microwaves are blocked by grounding either, although neutralizing the electric component of  this electromagnetic radiation may be helping.
Grounding in electrosmog
electrosmog free bedroom
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Microwaves can be shielded with conductive materials, but rather like lightwaves, they readily ‘flow’ around the edges, and through small gaps in the barrier, making 100% elimination difficult. It will penetrate, be absorbed, or reflected by the shield to varying degrees, depending upon materials, frequencies, etc.

          To completely block microwaves coming through a wall from an adjoining room may entail shielding the entire wall, which can be achieved with special conductive paint. Painting a whole room, would greatly reduce levels, and could be worth considering for a childs’ bedroom, for example. In such a scenario any sources within the room, such as baby monitors, should not be used, as the radiation would bounce around the room.

          A significant reduction can be made with strategically placed microwave shielding fabrics, and some experimentation using a meter:
   - Where microwaves are detected entering a window from external sources, shielding net curtains will keep it out…
   - If they are coming through walls, (from a neighbors’ cordless phone for example), a shielding sheet can be hung to reflect much of it away…
   - A wall shield behind the bed head would provide a sheltered space for sleep…

          A good approach is to combine a reflective fabric with one that absorbs the residual radiation - a layer of microwave blocking material with a layer (towards the inside of the room) of absorbent material.

           In practice it is difficult to predict how effective shielding will be, and will depend upon size of shield, position and nature of source, walls, reflective surfaces etc. , so an EMF detector is needed to test results.
          Tests on a cordless phone conducted here showed a 99% reduction in measured radiation when the phone was completly enclosed in either the blocking or absorbing fabric, and 94% reduction with the net curtain. Testing a 1m² wall screening fabric, with a cordless phone on the other side of the wall, cut the microwave levels in the room by around 60%.


Dirty electricity is controlled by identifying and dealing with sources, and with special filters plugged into wall sockets. Unfortunately, a single filter has only a small effect, so several will be needed throughout the house to have much impact. This can become expensive, and occupy lots of sockets!
          As mentioned on our ‘detection’ page, the best approach is probably to experiment with a rented meter and some sale/return filters from EMFields.org or wirless-protection.org. 


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 Microwaves pass through a gap
 Microwave shielding net curtain
 Combining fabrics for microwave shielding
Dirty electricity filter