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