Posted by Emil at Less EMF Inc on
URL: https://www.es-forum.com/shielding-tp1535782p1535791.html

At 07:35 PM 2/10/2004, you wrote:
>Charles, one more question to you - you mentioned "shielding the room". As
>I mentioned regaring canopies, they do the job, but shiled only the bed. I
>have done a lot of thinking on how to shield a room, but even if we
>neglect magnetic field from power lines, MW radiation is extremely hard to
>shiled. What do you generally suggest for propper shielding? If I wanted
>to live in urban areas, I would have needed attenuation of up to 1000
>times, as phone masts are all over...
>
>Drasko


Hi Drasko,

For walls, ceilings, doors etc., there is an excellent shielding paint
called CuPro-Cote (http://www.lessemf.com/paint.html). It is a water based
latex paint (easy to apply and easy to clean up) which has copper
particles. Attenuation is very good: over 75 dB from 1 MHz to 1 GHz. I
would guess that the shielding performance is still good at higher
frequencies, but it has not been formally tested above 1 GHz. You can paint
over it with normal latex paint to adjust color.

For windows, mesh type fabrics are available to make drapes (or drape
linings). The mesh fabrics allow light and air to pass. For example,
See-Thru Fabric is available in 12 foot wide by any length you want.
(http://www.lessemf.com/fabric.html)

As always, RF shields should be grounded (Earthed). Controlling leakage
points is critical for high attenuation RF shielding. Small leaks, such as
around a door or light switch can reduce overall shielding in the room to
20 dB, even if the walls are covered with 80 dB material.

Emil