Hello everyone.
I have to insulate non-convertible attics in a building. The surface to be insulated is 70m².
The joists are spaced 60cm apart and are 17cm high.
What would be the most adequate insulation material to meet
RT for old buildings or in lost attics R> 5 m2K / W.
Goods.
Attic insulation not suitable for conversion
Since the insulating wool with a conductivity of 0,04A / m ° C for an R of 5m2 ° C / W is a loss of 1/5 = 0,2W / m2 ° C, (a factor of 5 compared to 1m d 'insulation), the required thickness is 0,04 / 0,2 = 0,2m or 20cm of insulation wool of any kind with air immobilized with little.
If the conductivity is higher, the thickness must be increased in the same ratio.
http://de.wikipedia.org/wiki/Temperatur ... %A4higkeit
For more security and to compensate for future settlement, put a good margin with 30cm.
Otherwise for a very careful and valid installation see hack, otherwise the leaks and involuntary humidity destroy the final value of the insulation:
https://www.econologie.com/forums/post192740.html#192740
If the conductivity is higher, the thickness must be increased in the same ratio.
http://de.wikipedia.org/wiki/Temperatur ... %A4higkeit
For more security and to compensate for future settlement, put a good margin with 30cm.
Otherwise for a very careful and valid installation see hack, otherwise the leaks and involuntary humidity destroy the final value of the insulation:
https://www.econologie.com/forums/post192740.html#192740
0 x
It's a personal opinion, but even if it means doing insulation now I would no longer use glass wool because as said on other posts, I think that in terms of health, it is not trivial and I will look towards a more ecological / trendy insulation such as cellulose wadding. (a priori less "toxic" but not free from doubts either ... boron salt ...)
Last edited by moby25 the 03 / 02 / 11, 15: 26, 1 edited once.
0 x
Indeed, the glass wool on this thickness (20cm) would reach the RT in force.
The constraint is that I do not want to exceed the joist height which is 17cm with my insulation.
The ideal would be to have an insulator with very low conductivity and a thickness less than or equal to the height of the joists.
What I fear in insulating between joists with glass wool, are the air losses between it and the edges of the glass wool.
For that, I thought to deposit between joists of vermiculite on a height of 7cm in order to fill the voids (CT: 0,05W) then a layer of glass wool of 10cm above (CT: 0,04W).
vermiculite: 0,07ep / 0,05w = R 1,4
glass wool: 0,1ep / 0,04w = R 2,5
Thermal regulation not reached since R = 3,9w but is that the process can work in this way and can add thermal resistances.
The constraint is that I do not want to exceed the joist height which is 17cm with my insulation.
The ideal would be to have an insulator with very low conductivity and a thickness less than or equal to the height of the joists.
What I fear in insulating between joists with glass wool, are the air losses between it and the edges of the glass wool.
For that, I thought to deposit between joists of vermiculite on a height of 7cm in order to fill the voids (CT: 0,05W) then a layer of glass wool of 10cm above (CT: 0,04W).
vermiculite: 0,07ep / 0,05w = R 1,4
glass wool: 0,1ep / 0,04w = R 2,5
Thermal regulation not reached since R = 3,9w but is that the process can work in this way and can add thermal resistances.
0 x
It seems to me that you have to adjust the flow of insulation to the compaction you want, but it is obvious that for a first there is a helping hand to take.
In any case if you or others on this forum have an idea of the vermiculite compatibility between joists and glass wool on top, I am on the lookout for information.
In any case if you or others on this forum have an idea of the vermiculite compatibility between joists and glass wool on top, I am on the lookout for information.
0 x
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