"Rick" wrote in message
...
On Wed, 8 Jun 2005 17:40:25 +0100, "Bob Smith \(UK\)"
bob@nospamplease wrote:

I recently got a flyer through the letterbox from a company wanting to
take
advantage of grants to insulate private homes. They say they will
insulate
my house with mineral wool for £150, and that it is £400 without the
grant.

Is it any better than polystyrene? Does mineral wool conduct damp, ie,
does
mineral wool "bridge" damp proof courses. I know polystyrene does not
conduct damp. Also, what would be the cost difference?

Thanks

Bob


I looked into this,

In a cavity you need "cavity grade" mineral wool, which has been
treated to stop moisture transfer, then you can "full fill" the
cavity.

Polystyerine sheets are not graded fro "full fill". There is one
company in ireland that makes full fill polystyerine.


The puzzle is how do you get either of these into a cavity once the
house is built ?

See my post above. The polystyrene is in the form of 'granules' or little
balls - and is injected together with a binding glue to stick it all
together.

Kev