Pumping Cavity that has dry-lining. Worthwhile?

S'

Hi all,

I am renovating a 1998 two storey dormer build that was internally dry-lined.
There is 50mm areoboard fitted in a 100mm cavity also.

Is it worthwhile filling the cavity with pumped beads or another cavity insulation such as walltite?
Will pumping the cavity cause issues with the drylining such as mould, dampness etc?
I am planning on fitting ventilation system.
I have recently updated the house with new triple glazed windows .
I have been quoted 2k for beads and over 9k for walltite:eek:

Any advise would be grateful:)

MicktheMan

It's a dormer ...test it first for airtightness.

S'

MicktheMan wrote: »

It's a dormer ...test it first for airtightness.

Got it tested before the windows went in.
Air permeability of 12.054m3/h/m2@50pa

nailer54321

Who did you get to do the airtightness test, was it expensive and jow long did it take to do, Thanks.

MicktheMan

S' wrote: »

Got it tested before the windows went in.
Air permeability of 12.054m3/h/m2@50pa

:eek: - so you know where the issue is.


Concentrate on addressing the air leakage issues first. Then deal with your cavities if needed (which I doubt).

Yellow_Fern

S' wrote: »

Hi all,

I am renovating a 1998 two storey dormer build that was internally dry-lined.
There is 50mm areoboard fitted in a 100mm cavity also.

Is it worthwhile filling the cavity with pumped beads or another cavity insulation such as walltite?
Will pumping the cavity cause issues with the drylining such as mould, dampness etc?
I am planning on fitting ventilation system.
I have recently updated the house with new triple glazed windows .
I have been quoted 2k for beads and over 9k for walltite:eek:

Any advise would be grateful:)

Id agree with everyone else. Cavity pumping can cause damp, but the risk depends on your location. It is vastly more likely in Connemara than Meath. Check out the online maps of wind driven rain.

Fixing airtightess probably wont be a fun job as a dormer but you will probably be very glad you did it. You have a lot to gain from it

BryanF

S' wrote: »

Hi all,

I am renovating a 1998 two storey dormer build that was internally dry-lined.
There is 50mm areoboard fitted in a 100mm cavity also.

1. Is it worthwhile filling the cavity with pumped beads or another cavity insulation such as walltite?
2. Will pumping the cavity cause issues with the drylining such as mould, dampness etc?
3. I am planning on fitting ventilation system.
4. I have recently updated the house with new triple glazed windows .
5. I have been quoted 2k for beads and over 9k for walltite:eek:

Any advise would be grateful:)

1. Yes
2. Probably not. Installer should be covering this risk. Really you should have been asking this when you dry-lined, as cavity fill is often better than drylnning in this regard.
3. Improve your air-tighness x 5 times
4. Junction thermal details. Condensation at unctions?
5. There is a clear winner..

sydthebeat

S' wrote: »

Got it tested before the windows went in.
Air permeability of 12.054m3/h/m2@50pa

Sweet divine mother of Jesus!!!