"Andy Dingley" wrote in message
...
On 28 Jul, 19:37, "dennis@home" wrote:

How does a thin foil sandwich provide many stagnant layers that are more
than 6 mm thick?

They aren't (indivudally), the overall sandwich is.

There's no need for an insulating air layer to be 6mm thick. That's
one value for a _maximum_ thickness of a stagnation layer in these
circumstances. Layers thinner than this will still have nearly as
much thermal resistance.

They will be proportional.. a 1 mm layer will be 1/6 as good as a 6 mm
layer.
A really thin layer will be useless.


The overall foil sandwich is much thicker than this. It has several
layers, there are several air pockets.

The number of air pockets appears to confuse you.


As I said in the first place they don't work, they are too thin to work
as
claimed.

How thin do you think these foils are, when correctly installed?

Which one?
tri-iso super 10 is about 30 mm so it is about twice as good as double
glazing, that is, not vey good.