On 17 Apr 2005 11:02:04 -0700, wrote:

Rick wrote:
I have just seen some 25mm quitled roof insulation, that says it
acheives 0.2 U value, its about the same price as 100mm kingspan,
which is also about the same U value.

Does it work ?


not bubblewrap is it?

Put it this way, you know insulation works by trapping air and keeping
it still... what is so vastly superior about this product compared to
glass wool? How exactly does 1" of it trap and keep still more air?


NT

My thoughts exactly. It does have many (6-8) layers of silver foil,
which only deals with raidiant heat, not convected heat. It also uses
closed cell foam, which traps air better than glass wool, which is
very similar if not the same as some foam packaging you get.

The thing that really gets me thinking, is that you need to seal joins
between sheets, which makes it waterproof, but it also requires a
roofing felt above (25mm or more), and a vapor barror below (25 mm or
more), it also says in the insulation manual it needs 25mm above and
beolow, which make you think its also using the insulation of 50mm of
free air ..............

I also checked the performance report the vendor gave me, against the
people who he told me wrote it. I am not saying its fake, but the
specalisims of the authors are not insulation .............

Rick