I know that this has been covered several times but there never seems to
have been a definitive conclusion. Are there any comparisons between the
two systems in terms of suitability for an average detached house?

I am going to get cavity wall insulation installed but am left wondering
what the advantages (apart from a slightly better U value) to using the
polystyrene beads.

Andrew

"Andrew May" wrote in message
...
I know that this has been covered several times but there never seems to
have been a definitive conclusion. Are there any comparisons between the
two systems in terms of suitability for an average detached house?

I am going to get cavity wall insulation installed but am left wondering
what the advantages (apart from a slightly better U value) to using the
polystyrene beads.

AFAIK Poly beads eventually shrink.

R wrote:
"Andrew May" wrote in message
...
I know that this has been covered several times but there never
seems to have been a definitive conclusion. Are there any
comparisons between the two systems in terms of suitability for an
average detached house? I am going to get cavity wall insulation
installed but am left
wondering what the advantages (apart from a slightly better U value)
to using the polystyrene beads.

AFAIK Poly beads eventually shrink.

Can't see the OP, but I used to install CWI for many years and the main
disadvantage is that poly beads escape from every tiny hole, often leaving
huge voids.
They are supposed to be coated with a type of adhesive as they are blown
into the cavity but this seldom works as it should and installers often
switch this feature off because of blokages during installation.
Blown glass fibre never really blows out of holes because it tends to 'set'
into a blanket within the cavity

--
Phil L
RSRL Tipster Of The Year 2008

"Phil L" wrote in message
om...
R wrote:
"Andrew May" wrote in message
...
I know that this has been covered several times but there never
seems to have been a definitive conclusion. Are there any
comparisons between the two systems in terms of suitability for an
average detached house? I am going to get cavity wall insulation
installed but am left
wondering what the advantages (apart from a slightly better U value)
to using the polystyrene beads.

AFAIK Poly beads eventually shrink.

Can't see the OP, but I used to install CWI for many years and the main
disadvantage is that poly beads escape from every tiny hole, often leaving
huge voids.
They are supposed to be coated with a type of adhesive as they are blown
into the cavity but this seldom works as it should and installers often
switch this feature off because of blokages during installation.
Blown glass fibre never really blows out of holes because it tends to
'set' into a blanket within the cavity

I have had poly beads for more than 25 years now.
They only leak if you drill a hole through the wall and then only a few.
Mine are stuck together, but only a bit.


--
The newsgroup idiot aka TMH will be posting shortly to say whatever I post
is wrong.
He is *always* wrong.
Its due to his mental problems and I have stopped reading his posts so if
you really want to know why he is wrong you will have to quote him,
personally I would just killfile him and forget about him.

On 29 July, 11:34, Andrew May wrote:
I know that this has been covered several times but there never seems to
have been a definitive conclusion. Are there any comparisons between the
two systems in terms of suitability for an average detached house?

I am going to get cavity wall insulation installed but am left wondering
what the advantages (apart from a slightly better U value) to using the
polystyrene beads.

Andrew

Dear Andrew
My advice is not to worry too much about minor differences in U value
but to absolutely insist on a process (whatever it is) that is fully
reversible and the insulation is fully removable but machine sucking
it out. This WAS the case with Rentokil rockwool in the mid seventies
but suspect things have changed a lot since!

chris

"Huge" wrote in message
...


We have CWI, but it consists of soft crumbly grey stuff, like shredded
papier mache or the contents of soft furnishing, maybe.

Any idea what it is?

IIRC you can get CWI made from recycled plastic , wool and recycled paper so
it could be one of those.

If you have a bit to spare see if it melts or burns.

On Jul 31, 8:23*am, Chris George wrote:
On 29 July, 11:34, Andrew May wrote:

I know that this has been covered several times but there never seems to
have been a definitive conclusion. Are there any comparisons between the
two systems in terms of suitability for an average detached house?

I am going to get cavity wall insulation installed but am left wondering
what the advantages (apart from a slightly better U value) to using the
polystyrene beads.

Andrew

Dear Andrew
My advice is not to worry too much about minor differences in U value
but to absolutely insist on a process (whatever it is) that is fully
reversible and the insulation is fully removable but machine sucking
it out. This WAS the case with Rentokil rockwool in the mid seventies
but suspect things have changed a lot since!

chris

Thats one noticeable advantage with poly beads in situations where
there is a slight risk of problems occurring, ie non-recommended
cavity wall types.


NT