Make sure there's a mention of soldering and welding.

1 files changed, 3 insertions, 1 deletions

diff --git a/wiki/Shielding.mdwn b/wiki/Shielding.mdwn
index 88a379d..a950893 100644
--- a/wiki/Shielding.mdwn
+++ b/wiki/Shielding.mdwn
@@ -18,13 +18,15 @@ There are three primary ways in which things can reach or affect your safe space
         The shiny side of the foil will make a better connection than the dull side, and should be placed outwards for the first layer.  Create the first layer in spaced strips, leaving room between each strip for another strip to be placed over to connect them.  Then place the connecting strips, shiny side inwards, such that the shiny sides of the foil mate at the seams.  Be sure to allow no glue between these seams.  Close the seams by pressuring tape very tightly, to ensure there are no tiny gaps, or by using staples which are placed very close together.
         A simple door consists of a small subsection of frame which is covered in foil and may be pressed tightly against an opening, and simply held in place by pressure.  More advanced doors may be purchased from various sources.
 
+    If you have metal plates rather than foil, you can solder or weld them together, which will give more effective shielding more rapidly than foil.  Leave no gaps in any of the joints, providing a complete connection between all edges.  The solder joints or welds provide excellent conductivity for electric shielding.  A commonly available metal plate is steel, which has less electric shielding compared to aluminum or copper, but will offer magnetic shielding as well.
+
     Test your room by seeing if your cell phone works in there, or if you can get wifi.  If either of these function, you definitely need to close any small gaps, or make another space or another layer inside the one you just made.
 
 * Magnetic fields and low-frequency electromagnetic radiation
 
     A common form is AC power.  Shielding from these signals is more difficulty and may involve a magnetic metal such as iron or steel.  Researchers use strong magnetically shielded rooms to study the magnetic fields produced by the human brain, but in general it is more common to use and study the electric fields.
 
-    On Jeremy Radlow's old page, he mentioned the approach of mixing iron filings with paint in order to provide shielding which would include some protection against magnetic fields.  I might imagine alternating layers of such paint with strong electric field shielding between them.
+    On Jeremy Radlow's old page, he mentioned the approach of mixing iron filings with paint in order to provide shielding which would include some protection against magnetic fields.  I might imagine alternating layers of such paint with strong electric field shielding between them.  Insulation such as normal paint should be placed between the layers, so that the iron filings do not disturb the smooth surface of the electric shielding.
 
 * Physical vibrations