I have just got a quote for "rock wool" cavity insulation.  It is the sort 
that is pumped into the cavity.  As any one had problems with it coming into 
the house through holes in the inside wall, say if soil pipes have not been 
sealed after fitting.  I friend says it is a problem with some types of 
insulation, but not sure about rock wool.
Thanks.
Neil

On Mon, 12 Sep 2005 11:26:10 +0100, "Neil" 
wrote:

| I have just got a quote for "rock wool" cavity insulation.  It is the sort 
| that is pumped into the cavity.  As any one had problems with it coming into 
| the house through holes in the inside wall, say if soil pipes have not been 
| sealed after fitting.  I friend says it is a problem with some types of 
| insulation, but not sure about rock wool.

I had foam put in many years ago without problems, except lumps of foam in
the underdrawing, where the cavity was no sealed.



-- 
Dave Fawthrop <dave hyphenologist co uk> 
"Intelligent Design?" my knees say *not*.
"Intelligent Design?" my back says *not*.

Thanks Dave.  Do think this "rock wool" type will be foam?  I should have 
checked when guy came for quote but I was not at home.
Neil

On Mon, 12 Sep 2005 11:54:34 +0100, "Neil" 
wrote:

| Thanks Dave.  Do think this "rock wool" type will be foam?  I should have 
| checked when guy came for quote but I was not at home.

No Rock wool, which I looked into at the time, was bits of fluffy stuff
which they blow through a pipe into the cavity
Pics at
www.orchidlady.com/media/rockwool.htm
Or
http://www.taiyo-kogyo.co.jp/service/nozai/980909ar-rockwool.JPG
conical piles at the front

Now if rock wool would have fallen into my underdrawing I do not know.
because I do not know how well it sticks together in lumps.  Foam is
partially set by the time it gets to a hole, so only a smallish amount can
escape.

I only mentioned it because the foam definitely came out.

Only old houses need cavity insulation, because the new ones have
insulating board in the cavity.
http://www.bbs-ltd.com/images/photos/insulation_cavity_polyfoam.gif
-- 
Dave Fawthrop <dave hyphenologist co uk> 
"Intelligent Design?" my knees say *not*.
"Intelligent Design?" my back says *not*.

"Neil"  wrote in message 
news:dg3l43$sbh$1@news8.svr.pol.co.uk...

>I have just got a quote for "rock wool" cavity insulation.  It is the sort 
>that is pumped into the cavity.  As any one had problems with it coming 
>into the house through holes in the inside wall, say if soil pipes have not 
>been sealed after fitting.  I friend says it is a problem with some types 
>of insulation, but not sure about rock wool.
> Thanks.
> Neil


We had no problems at all in our70 year old house.

Mary

>
> 

> We had no problems at all in our70 year old house.
>
> Mary


Did you use rock wool pumped into the cavity.
Neil

Hi

Had Rockwell insulation done a couple of years ago.  Took just over 2 hrs 
for a 1930's semi.  Had no problems with leakage in the house.  A hole was 
in the old coal shed where wires had been taken out to the garage, that was 
the only place I saw a few traces.

Rob

Neil wrote:


> I have just got a quote for "rock wool" cavity insulation.  It is the sort
> that is pumped into the cavity.  As any one had problems with it coming into
> the house through holes in the inside wall, say if soil pipes have not been
> sealed after fitting.  I friend says it is a problem with some types of
> insulation, but not sure about rock wool.
> Thanks.
> Neil


Had rock wool type insulation installed in our 50's house - its in a
pellet form that expands when pumped into cavity - made our house feel
warmer and  saving on fuel bill. Have you checked for subsidies? When
ours was installed the cost was 175GBP for 4 bed detached the cost was
subsidised by electricity board. I believe these subsidies are still
available 

Phil

"Neil"  wrote in message 
news:dg3s0m$ndi$1@news7.svr.pol.co.uk...

>
>> We had no problems at all in our70 year old house.
>>
>> Mary
>
> Did you use rock wool pumped into the cavity.

Yes.

> Neil
> 

Pellets are usually just 'polystyrene' type balls that fill the gap -
never heard of ones that expand once inside the cavity.  Rock wool
comes in large bales, is more like a mix between cotton wool and
fibreglass, and gets chopped up in a machine before being blown into
the cavity.

Since it's blown in under a certain pressure to ensure it fills the
cavity properly, you might get some leakage as it it being blown in,
but not afterwards.  I had a slight leak into the loft where there was
a gap in the mortar between blocks the inner leaf.  My dad had the wet
foam type put in 25 years ago, and still has large 'balls' of set foam
in his loft where it leaked in.

http://www.ncia-ltd.org.uk/ has all the information you need on types
of insulation and their installation.

Alan wrote:

> Pellets are usually just 'polystyrene' type balls that fill the gap -
> never heard of ones that expand once inside the cavity.  Rock wool
> comes in large bales, is more like a mix between cotton wool and
> fibreglass, and gets chopped up in a machine before being blown into
> the cavity.


I wonder whether there is any posibillity of the fluffy stuff settling 
over the years.

After all, our dry-powder fire extinguiser has to be "un-settled" every 
year then again, I suppose there are wall-ties in the cavity giving some 
load bearing surface to the filling.

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