[Strawbale] Concrete Base - foundations question??

[Kurt Splittdorf]

Hi Joost,
it is part of my job, so i know some about the "E-smog", that is the 
way we call it in germany.
you can demagnetise iron, but it is complicatet and expensiv!
The iron is like a permant magnet, the magnetismen will be there for a 
very long time. it gets usaly magnetised during the production process 
or when you weld the iron.
It does shield off electro magnetic radiation, but this effect depends 
on the mesh width. And the way we use the steel in concrete it has no 
efect at all!!! It only keeps the very long waves out of the house. I 
just want to name the Schumann-Frequenz, it is about 8 Hz. If we talk 
about mobiles than it is totaly worthless! the waves are to small. the 
higher the frequence is that you want to shield off, the smaller the 
mesh width need to be.
The good results in reduction of EMF is because of the mass of the 
concrete.
But you dont need a lot of iron for a strawbale house, only in the 
foundations we use a lot of it.
i suppose:
minimize the iron
if you habe a problem.... demagnetise or keep distance
kurt



> Hi Kurt,
>  
> what i know is that if a steel ship is moored for a long time (a year 
> or so) in the same direction it gets magnetised in the same direction 
> as the earth magnetic field. To let the compasses work well the ships 
> then need to be demagnetised. So parallel i guess that the steel in 
> concrete will also adapt to the local magnetic fields and over time, 
> like a cameleon, have the same properties as the land beneath.
> The good thing of steel is that it does shield off lots of electro 
> magnetic radiation. so for that reason i might rather use some steel 
> in my straw walls rather then to be afraid of magnetic disturbances. 
> However i'm not very experienced with devining and i'm sure a sourcer 
> can tell you more about this
>  
> bye
>  
> Joost Brand
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Baubiologie & Umweltanalytik
Kurt Splittdorf
Baubiologe SIB

Hernsterstr. 11					Sandweg 27
97892 Kreuzwertheim			60316 Frankfurt am Main
Fon: 09342-84108				Fon: 069-97609370
Fax: 01212-572531764			Fax: 01212-572531764

www.baubio.net				Kurt-Splittdorf at baubio...
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