Insulation of vertical walls: double air gap, pb or not?

Heating, insulation, ventilation, VMC, cooling ... short thermal comfort. Insulation, wood energy, heat pumps but also electricity, gas or oil, VMC ... Help in choosing and implementation, problem solving, optimization, tips and tricks ...
kissground
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Registration: 26/09/11, 15:43
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Insulation of vertical walls: double air gap, pb or not?




by kissground » 26/09/11, 16:59

Hello everybody

Here I am among you asking for your opinions, tips, ...
I'm trying to insulate the vertical walls of my house.
Here are the different layers that I plan to put in place:
Brick wall 36cm ==> Rock wool panel in 100mm => Rock wool panel in 45mm => Plasterboard plate (BA13).

The 45mm rock wool panel is placed in the metal structure that I am putting in place.
The 100mm rock wool panel will be placed between the wall and the metal structure, crossed in relation to the 45mm panels.

My question is this: between the brick wall and the metal structure, there is on average 140mm but this can vary between 100mm and 180mm.
So am I obliged to "press" (using battens fixed against the wall for example), the rock wool in 100mm against the metal structure to have only one air gap between the wall and this one. Or, can I leave the rock wool without "flattening" it, but this could create in some places two air pockets (Brick wall ==> Air blade ==> Rock wool in 100mm ==> Air knife ==> Metal structure)?

I have gone through your forums, other websites, search engines ... But I can't make up my mind. This is why I am calling on you to give me your advice and I will try to adapt my solution to your opinions.

Thank you all, don't hesitate if you have any questions or I forgot something that could help you, cordially Fabrice :D
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dedeleco
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by dedeleco » 26/09/11, 17:08

Avoid air circulation and condensation in the air cavities, which are often unintended but cause problems.
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kissground
I discovered econologic
I discovered econologic
posts: 2
Registration: 26/09/11, 15:43
Location: North part




by kissground » 26/09/11, 20:58

I add a little info :) Nothing very exceptional, but hey, I did not mention it ... And it is a bit to come back to the first answer of "dedeleco".
The rock wool in 100mm is bare, and that of 45mm will be provided with a vapor barrier.

dedeleco wrote:Avoid air circulation and condensation in the air cavities, which are often unintended but cause problems.

All right, so does that mean it's possible to have two air knives? If you could better give your opinion on my situation!

I'm still waiting for several returns, which will allow me to better judge. Thank you, Fabrice
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dedeleco
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by dedeleco » 27/09/11, 01:53

useful advice for future health:
Instead, use boron-free cellulose wadding instead of rock wool, here looks a bit like asbestos, and which may later be banned, given the gradual discovery of hidden dangers, as for asbestos:
read:
http://andeva.free.fr/materiau/fibres_s ... ion_hp.htm
http://www.terrevivante.org/473-laines- ... -sante.htm


boron is forbidden:
http://www.nature-et-developpement.com/images/ouate.pdf
http://www.notre-planete.info/

The February 9 2011 is an important date for conventional cellulose wadding. From this point
day and according to the JORF of August 2010 some biocides, especially boron salt, are prohibited
marketing


boron-free wadding supplied by:!
http://www.nature-et-developpement.com/ ... 0-N97.html


The air spaces are to be filled with cellulose wadding, even if it is not very tight (bubbles of the order of cm), to immobilize this air and improve thermal insulation.
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