Isolate vertical walls with an air gap and lathing?

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Christophe
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Re: Insulate vertical walls with an air gap and lathing?




by Christophe » 23/11/22, 15:27

Remundo wrote:For a thermal strainer built in 1960, it's safe to say that the insulation I installed works well.


Yes that looks good! You don't have the figures before the works I presume?
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Re: Insulate vertical walls with an air gap and lathing?




by Remundo » 23/11/22, 15:33

I didn't archive them unfortunately. When I go to EDF-ENEDIS, 2019 is no longer available.
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Re: Insulate vertical walls with an air gap and lathing?




by izentrop » 23/11/22, 15:38

Christophe wrote:Lost penis... 40 mm of glass wool is at best an R of 1 to 0.04 of lambda!
Source ? because I have the one that proves that 20 mm or 300 mm of air space is the same https://energieplus-lesite.be/donnees/e ... hes-d-air/
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Re: Insulate vertical walls with an air gap and lathing?




by Christophe » 23/11/22, 15:44

izentrop wrote:
Christophe wrote:Lost penis... 40 mm of glass wool is at best an R of 1 to 0.04 of lambda!
Source ? because I have the one that proves that 20 mm or 300 mm of air space is the same https://energieplus-lesite.be/donnees/e ... hes-d-air/


That's double dishonesty you're doing there!! : Evil: : Evil: : Evil:

You wrote :

"same thickness in glass wool = 3.15 the double"

same thickness = 40 mm so R of 1 max... so CLOSE THE TDC!

We are not talking about the air gap! We're talking about your false equivalence with your filthy lobby chemical wool!

Your link doesn't tell me anything, the best is 40 mm of motionless blade according to the data above provided you block the radiation (not in your link): heating-insulating / isolating-of-walls-vertical-with-blade-and-air-and batten-t8971.html (here is my source)
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Re: Insulate vertical walls with an air gap and lathing?




by Christophe » 23/11/22, 15:46

Remundo wrote:I didn't archive them unfortunately. When I go to EDF-ENEDIS, 2019 is no longer available.


Yes that's what I thought...
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Re: Insulate vertical walls with an air gap and lathing?




by izentrop » 23/11/22, 16:00

100 mm thick semi-rigid ISOVER glass wool, covered with a 100 x 100 mm squared kraft surfacing on one side. Lambda = 0,032W/(mK). R = 3,15 m².K/W.

For 2 air gaps of 40 + 10 of thin insulation = 90 mm, we will say 2.5 in wall glass wool.
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Re: Insulate vertical walls with an air gap and lathing?




by Remundo » 23/11/22, 16:17

10 cm thick is too much for interior insulation; we lose a lot of floor space (1m² for a perimeter of 10 m)

on the other hand, the manufacturers of thick insulators gargle of their lambda and R. However I realized that these wools, if they conducted little heat, did not offer much protection for infrared radiation.

clean air anyway has a lower lambda than wool (0,02 W/m/K against 0,03 and more).

for example E=40 mm of air at lambda=0,025 W/m/K and S = 1 m² give:

Rth = E / lambda / S = 0.04 m/0.025 W/m/K /1 m² = 1,6 m². K/W

it is therefore 50% of the thermal resistance of wool, however the air is free and self-possessed!

Regarding the wools too, having handled them, I find them quite boring to cut, not easy to fix and they make a dust that is unpleasant to breathe.

The thin insulation is cut to size with a cutter. Staples on the joists fix it firmly and quickly. Layers of thin insulation can be overlapped.

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We clearly realize that getting obsessed with conducto-convection is futile, since 2/3 of thermal leaks are by radiation. We must intervene primarily on this aspect, and we need metal mirrors to reflect the waves. In this, the aluminum + wadding multilayers are very good. While the compartmentalized air gap does the job of combating conducto-convection.

Blocking infrared radiation is useful both in winter (to keep the heat in the house) and in the summer (to keep the house cool, since the warm radiation comes from outside in the summer).
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Re: Insulate vertical walls with an air gap and lathing?




by izentrop » 23/11/22, 20:06

Remundo wrote:clean air anyway has a lower lambda than wool (0,02 W/m/K against 0,03 and more).
for example E=40 mm of air at lambda=0,025 W/m/K and S = 1 m² give:
Rth = E / lambda / S = 0.04 m/0.025 W/m/K /1 m² = 1,6 m². K/W
It would be great if it worked like that : Lol:
Yes, air is a good insulator when it is trapped in polystyrene bubbles or glass wool fibers.
If the thickness of unventilated air exceeds 20 mm, convection phenomena cannot be avoided.
Image https://www.thermexcel.com/french/energ ... _12831.htm
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Re: Insulate vertical walls with an air gap and lathing?




by Remundo » 23/11/22, 20:50

precisely, the thin insulation that I insert in my 40 mm air gap is padded and not pressed against the wall. the maximum thickness of free air in the blade is 10 mm followed by other layers of thickness varied between 1 and 5 mm.

as for your table, I wonder what measurements they based themselves on. there is no data on the compartmentalization of the air space.

the table does not indicate thermal resistances, but thermal CONDUCTANCES.

on the other hand the thermal conductance in W/m²/K cannot be zero, it is physically impossible. it would be a perfect thermal insulator.

you look as strong in covid as you do in physics...
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Re: Insulate vertical walls with an air gap and lathing?




by Christophe » 24/11/22, 09:05

izentrop wrote:100 mm thick semi-rigid ISOVER glass wool, covered with a 100 x 100 mm squared kraft surfacing on one side. Lambda = 0,032W/(mK). R = 3,15 m².K/W.

For 2 air gaps of 40 + 10 of thin insulation = 90 mm, we will say 2.5 in wall glass wool.


Except that Remundo has a 40 mm blade...

Are you manipulating on purpose? : Shock: In short, we recognize the zizi... :|
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