Google Groups no longer supports new Usenet posts or subscriptions. Historical content remains viewable.
Dismiss

Cavity Insulation: Fibre vs Polystyrene Beads

325 views
Skip to first unread message

Andrew May

unread,
Jul 29, 2009, 6:34:30 AM7/29/09
to
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

R

unread,
Jul 29, 2009, 1:32:30 PM7/29/09
to

"Andrew May" <andrew...@hotmail.com> wrote in message
news:7damtnF...@mid.individual.net...

AFAIK Poly beads eventually shrink.


Phil L

unread,
Jul 30, 2009, 7:36:32 PM7/30/09
to

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


dennis@home

unread,
Jul 31, 2009, 3:14:32 AM7/31/09
to

"Phil L" <neverc...@hotmail.com> wrote in message
news:48qcm.62357$OO7....@text.news.virginmedia.com...

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.

Chris George

unread,
Jul 31, 2009, 3:23:22 AM7/31/09
to

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

Message has been deleted

dennis@home

unread,
Jul 31, 2009, 5:03:29 AM7/31/09
to

"Huge" <Hu...@nowhere.much.invalid> wrote in message
news:7dfnp1F...@mid.individual.net...


> 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.

NT

unread,
Jul 31, 2009, 5:41:18 AM7/31/09
to

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

0 new messages