Argument for external thermal insulation (ITE)

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Christophe
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Argument for external thermal insulation (ITE)




by Christophe » 08/04/12, 09:57

Synthesis in favor of thermal insulation from the outside by Targol:

In France, in an immense majority of cases, the thermal insulation of buildings in general and of dwellings in particular is carried out by an internal lining of the walls. Few people know about exterior insulation which, however, has many advantages ...

There are many arguments in favor of exterior insulation:

With external insulation, the floor area of ​​the insulation is taken from the outside and not from the surface of the housing.

An insulating lining, to be a minimum effective, takes minimum 8cm.

This value represents the minimum insulation in plasterboard lined with: 13mm of plaster, 50mm of insulation then 10 to 15mm of vacuum due to the laying on plots of glue. We can also put this kind of plates on rails, but the thickness is then increased

On a 9m² room, this represents - with a ladle :) - 0,72m² of surface area lost if all the walls are insulated (I didn't count a door either).

When dubbed from the outside, this surface is lost on the street or on the garden, not on the accommodation (s).

Insulation from the outside is more effective. In fact, unless the internal partitions are also insulated (which loses surface and seriously increases the price), thermal bridges are made on the cross walls.
The coldness of the peripheral walls passes through the mass of these perpendicular walls to enter the apartments.

In insulation from the outside, it is the overall building envelope that is insulated. The exterior walls are therefore "hot". The only points to watch out for in this type of insulation are the openings. It is important to prevent the cold from entering the walls through these openings.

The last advantage, but not least in the context of global warming, is thermal inertia.
In the case of insulation from the inside, the parts are like "in a thermos". If we put cold in it, it stays cold, if we put hot, it stays hot.
You can imagine what it can be like if someone leaves the south-facing window open in the middle of a dodger ...

In the case of insulation from the outside, the entire mass of the walls is part of the interior "micro-climate".
This mass, due to its capacity to store heat and to restore it in deferred mode, will participate both in winter comfort but also in summer.

* In winter by avoiding the sensations of cold walls and by allowing ventilation without problem without cooling the rooms too much,
* In summer by bringing freshness during the day, freshness that can be maintained by creating drafts at night to remove calories from the walls.

Living in a very poorly insulated house but with 60cm walls, I can assure you that the thermal inertia of the walls, in summer, largely replaces an air conditioning (up to 13 ° C difference with the outside during the heat wave of 2003 just by closing the shutters in the sun and opening the windows at night).

Insulation from the outside, there is really only one argument that can be against ...

... but it can have an immense weight, it is the preservation of facades.

If the building (or the house) is in freestone, if one or more facades are classified, or, quite simply, if the béacirc; timent has a stamp that "cannot" be modified, this simple argument may suffice. to seal the best project.
On the other hand, if the building is relatively recent, does not have a particular "look" that must be preserved at all costs, nothing is against this type of insulation, on the contrary ...


Written in 2007 by Targol and found here: https://www.econologie.info/index.php/?2 ... -exterieur
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dedeleco
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by dedeleco » 08/04/12, 13:15

Perfectly, minimum to have in the brain, with the need to move all the windows outwards, to remove the thermal bridges around the periphery of these windows, which would otherwise remain, which drags down the price of the renovation, and makes double glazing absurd made before, without also insulating from the outside.
Then division by more than 4 of the heating expenses, passing from more than 200 to 50KWh / m2 approximately.
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by Philippe Schutt » 08/04/12, 14:04

Just a few remarks to put the advantage of the ITE into perspective:

-The cold wall feeling is also eliminated by interior insulation
- inertia is not always an advantage, for example to switch from daytime temperature to nighttime temperature and vice versa. With me it is 2 hours, while in interior insulation it would be 1/2 hours. Some rooms such as bathrooms are only to be heated for a very short time, again advantageous to the interior insulation.

On the other hand, there is an advantage omitted from the external insulation: the slabs and walls remaining + - at the same temperature, cracks due to differences in expansion are avoided.
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by dedeleco » 08/04/12, 14:58

in interior insulation it would be 1 / 2h

so logically house, without concrete blocks, or concrete (about the day) and about 50 to 200mm of air insulation trapped immobile, given the coefficient of thermal diffusion ??
http://fr.wikipedia.org/wiki/Diffusivit%C3%A9_thermique
Just to fix the ideas?
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by elephant » 08/04/12, 15:56

This seems to me a valid solution, and it's even pretty: we renovated an entire city not far from my home 2 years ago: we don't recognize the houses, it's nice. The boilers have also been replaced. But what about the risk of trapping moisture in the wall?
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by Ahmed » 08/04/12, 20:45

The argument that kills in favor of insulation from the outside: do you know many polar bears isolated from the inside? : Mrgreen:
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by dedeleco » 08/04/12, 21:19

Ahmed wrote:The argument that kills in favor of insulation from the outside: do you know many polar bears isolated from the inside? : Mrgreen:


Well, seals, mostly isolated by their fat inside !!

Even the whales !!
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by Ahmed » 08/04/12, 21:27

It was a joke! ... and seals / whales are not polar bears! 8)

Edit: Thank you for placing this message in the "humor" thread!
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by Obamot » 09/04/12, 01:35

Philippe Schutt wrote:Just a few remarks to put the advantage of the ITE into perspective:

-The cold wall feeling is also eliminated by interior insulation
- inertia is not always an advantage, for example to switch from daytime temperature to nighttime temperature and vice versa. With me it is 2 hours, while in interior insulation it would be 1/2 hours. Some rooms such as bathrooms are only to be heated for a very short time, again advantageous to the interior insulation.

On the other hand, there is an advantage omitted from the external insulation: the slabs and walls remaining + - at the same temperature, cracks due to differences in expansion are avoided.


Absolutely, this is why:
- it is better to start designing a facade insulation with the roof.
- and it is better to have at least 20 cm of minimum insulation, then it becomes really comfortable.
- and of course VMC with double flow of rigor ...
- it's case by case eh, so we will not generalize ...
Obviously it is better to take advantage of the installation of double windows to carry out this work. Because in this case, we keep the old windows and frames as they are but we will renovate if necessary, and we mount the double glazing on the front ... Here we are at the top with cellulose wadding.
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by Remundo » 09/04/12, 08:17

Targol wrote:If the building (or the house) is in freestone, if one or more facades are classified, or, quite simply, if the béacirc; timent has a stamp that "cannot" be modified, this simple argument may suffice. to seal the best project.
On the other hand, if the building is relatively recent, does not have a particular "look" that must be preserved at all costs, nothing is against this type of insulation, on the contrary ...

Interesting topic.

On this last point, there are now rather successful facade imitations if we wish to leave a particular aspect (stone wall, brick, wooden ...)

But actually, if you want to keep the facade as it is, it is not possible.
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