I get this question fairly often, so I wanted to look into it.
First of all, to answer your question: Yes, Aluminum foil, much like Aluminum mesh will shield against most wave length radio frequency radiation.
Now let’s dive a bit deeper.
Does Aluminum Foil Protect Against Radio Frequency Radiation?
Aluminum foil does block radio frequency waves. Since the Aluminum is a conductor of electricity, it forms a barrier often called a Faraday Cage, entirely stoping the radio waves. You can try this for yourself. Get a large sheet of aluminum foil, lay it out flat, set your cell phone inside and try calling it, the phone won’t have any signal. These radio waves are a form of EMF radiation. The aluminum field acts as a barrier and completely blocks those waves.
If you’ve hard of a faraday cage before, it’s essentially just a structure, often made of a wire mesh of a metal like aluminum, that completely blocks radio and microwave radiation. The thickness of the metal does not matter, super thin aluminum foil will work just as well as a thick and heavy sheet of metal, the important factor is that there are no holes larger than the shortest wavelength of radio or microwave trying to enter. Have a look at your microwave. Almost every microwave window has a subtle metal mesh covering the window, this is a faraday cage material, like aluminum, made small enough that the microwave radiation can’t exit.
Aluminum foil does work, although a better version of it would be Aluminum screening as is used in the video below. It will effectively block both RF radiation, as well as microwave radiation. However, you do need to remember that things like Aluminum do block the radiation, but they don’t absorb it. RF and microwave EMF radiation travel in straight lines, so you are only protected if there is something blocking directly between the source of the radiation and you. It is not smart to use a lot of materials like EMF protection paint (read my article on that here) or aluminum in your home if you have wifi or radiation emitted devices, because the waves will just be bounced around and accelerated. Aluminum mesh works great at keeping RF waves out of your home, like lowering the ambient EMF radiation from local cell towers entering your home.
Watch the video below to the end to see just how effective Aluminum can be at blocking RF radiation from routers, cell phones, smart meters and more.
As you can see from the video, Aluminum foil, or in this case aluminum mesh with holes small enough to block the wavelength, is highly effective at stopping EMF radiation.
Get an EMF Meter
This is why it can be very important if you’re looking to make your home a safer place to get your own EMF meter. I personally like the Trifield 100XE (read my review) or the Cornet ED78S (read my review). This way you can go around your home or office and see what is emitting harmful EMF radiation and how much. This is also really helpful when you’re trying to implement changes to reduce this radiation to ensure that it is working.
Other EMF Blocking Metals
Aluminum foil is really easy and inexpensive, is highly effective, and works extremely well for DIY projects around the home. There are other metals that work really well for this purpose and for the creation of Faraday cages. The two other metals that you see most commonly would be Iron, and Steel. This is the reason that often times in buildings with significant steel framing, you will have various dead spots where you won’t receive a cellphone signal.
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