Topping up cavity wall insulation

[David.WE.Roberts]

We have blown fibreglass insulation in the older parts of the walls.

During the extension work we must have lost some of the original cavity
wall insulation.

Is it possible to top up this kind of insulation?

Given that the normal method of installation is blowing up from the ground
floor could this be done for a top up?

Cheers

Dave R

[Phil L]

You couldn't d-i-y, but you could aks a local insulation company to do it
for you, but the amount they'd charge versus the benefits would make it a
waste of time and money.

FWIW, it doesn't settle, that is to say that if you've lost some from the
bottom, this doesn't mean you now have gaps at the top.

The chances are you lost very little, and I'd wager that the parts that did
void are now internal or the builders shoved cavity batts in there to
prevent further loss

[dennis@home]

You won't miss it..

you can't install it by blowing it up from the ground floor, you have to
have holes quite close together to get anywhere near a proper fill.

[meow...@care2.com]

On Wednesday, March 26, 2014 12:26:55 PM UTC, David.WE.Roberts wrote:

> We have blown fibreglass insulation in the older parts of the walls.
> During the extension work we must have lost some of the original cavity
> wall insulation.

Why do you think that?

> Is it possible to top up this kind of insulation?

Yes. Polystyrene bead is easy to diy - if its actually needed.

> Given that the normal method of installation is blowing up from the ground
> floor could this be done for a top up?
> Cheers
> Dave R

NT

[Jeremy Nicoll - news posts]

meow...@care2.com wrote:

>On Wednesday, March 26, 2014 12:26:55 PM UTC, David.WE.Roberts wrote:
>
>> We have blown fibreglass insulation in the older parts of the walls.
>> During the extension work we must have lost some of the original cavity
>> wall insulation.
>
>Why do you think that?

I've had windows replaced and two wall cut-outs made in a house with CWI,
and it was obvious that some was lost: fluffy stuff blowing around the
garden...

--
Jeremy C B Nicoll - my opinions are my own.

Email sent to my from-address will be deleted. Instead, please reply
to newsre...@wingsandbeaks.org.uk replacing "aaa" by "284".

[David.WE.Roberts]

On Wed, 26 Mar 2014 10:30:42 -0700, meow2222 wrote:

> On Wednesday, March 26, 2014 12:26:55 PM UTC, David.WE.Roberts wrote:
>
>> We have blown fibreglass insulation in the older parts of the walls.
>> During the extension work we must have lost some of the original cavity
>> wall insulation.
>
> Why do you think that?

Umm...I saw it coming out and blowing around.

Just not sure how much we lost.

[meow...@care2.com]

Polystyrene bead can be done with just a handheld hoover and a waste pipe. And something to make the holes. Do holes frmo the inside, daft to damage the bricks for the sake of a bit of filler.


NT

[dennis@home]

On 26/03/2014 20:58, meow...@care2.com wrote:


> Polystyrene bead can be done with just a handheld hoover and a waste
> pipe. And something to make the holes. Do holes frmo the inside, daft
> to damage the bricks for the sake of a bit of filler.
>
>
> NT
>

If you drill it in the mortar joints you don't damage the bricks.

[meow...@care2.com]

On Wednesday, March 26, 2014 9:42:07 PM UTC, dennis@home wrote:
> On 26/03/2014 20:58, meow...@care2.com wrote:
> > Polystyrene bead can be done with just a handheld hoover and a waste
> > pipe. And something to make the holes. Do holes frmo the inside, daft
> > to damage the bricks for the sake of a bit of filler.

> If you drill it in the mortar joints you don't damage the bricks.

cant get big enough holes without cutting brick corners off.


NT

[David.WE.Roberts]

Are you recommending beads to top up a fibre fill?

[meow...@care2.com]

> Are you recommending beads to top up a fibre fill?

I simply said its an option.


NT

[dennis@home]

They seem to manage on most houses, do you have a thin joint system?

[dennis@home]

On 27/03/2014 09:18, David.WE.Roberts wrote:

>> Polystyrene bead can be done with just a handheld hoover and a waste
>> pipe. And something to make the holes. Do holes frmo the inside, daft to
>> damage the bricks for the sake of a bit of filler.
>>
>>
>> NT
>
> Are you recommending beads to top up a fibre fill?
>

Doing beads properly is difficult without the correct equipment, they
are supposed to be coated in glue as they are blown in.

If they aren't they fall out through even small holes.

[meow...@care2.com]

On Thursday, March 27, 2014 4:10:07 PM UTC, dennis@home wrote:
> On 26/03/2014 21:52, meow...@care2.com wrote:
> > On Wednesday, March 26, 2014 9:42:07 PM UTC, dennis@home wrote:
> >> On 26/03/2014 20:58, meow...@care2.com wrote:

> >>> Polystyrene bead can be done with just a handheld hoover and a waste
> >>> pipe. And something to make the holes. Do holes frmo the inside, daft
> >>> to damage the bricks for the sake of a bit of filler.

> >> If you drill it in the mortar joints you don't damage the bricks.

> > cant get big enough holes without cutting brick corners off.

> They seem to manage on most houses, do you have a thin joint system?

On most I've seen you can see the brick damage where they've blown it in


NT

[meow...@care2.com]

On Thursday, March 27, 2014 4:12:32 PM UTC, dennis@home wrote:
> On 27/03/2014 09:18, David.WE.Roberts wrote:

> >> Polystyrene bead can be done with just a handheld hoover and a waste
> >> pipe. And something to make the holes. Do holes frmo the inside, daft to
> >> damage the bricks for the sake of a bit of filler.

> > Are you recommending beads to top up a fibre fill?

> Doing beads properly is difficult without the correct equipment, they
> are supposed to be coated in glue as they are blown in.
> If they aren't they fall out through even small holes.

Glue coating is less easy to diy without the right kit. But for walls that are generally not recommended to be CWIed you need the beads uncoated so they can be sucked out if ever needed. Yes, it does mean checking for holes :) Otherwise christmas comes early.


NT