ojal wrote:Obamot wrote:- you do not give the thickness or the types of insulation in under-roofing, nor do we know how they were laid (photos would help, especially the areas of jointing between insulation and against the structure.)
The attic is not insulated, the insulation is projected on the plasterboard ceilings of the floor and this insulation is without breaking over the entire surface of the house in the inner periphery of the marrow ...
I do not understand, you say in introduction:
ojal wrote:We had reinforcement of the attic insulation 3 years ago, but we did not feel any difference in summer comfort ...
Now you tell US that they would "not be isolated"!
ojal wrote:The interior insulation of the walls comes below the ceiling insulation and therefore at this level there is no thermal bridge ...
I do not know what definition you give to thermal bridges. But precisely there is always with the ITI vs ITE (an ITI in your case is to prohibit) the thermal bridge in ITI is permanent since it is against all the inertia of the walls of facade that must fight, I do not see why you would say there would not be any?
ojal wrote:The facades accumulate heat, it feels very well in the late evening or outside we feel very well the radiation emitted especially on the south and west faces ...
That's what I'm telling you, and the phenomenon is magnified by the absence of ITE on the front walls of the attic (or ITI it does not matter)
ojal wrote:In the winter, I can measure colder zones and thus thermal bridges with a thermal bridge, but in summer, all the walls are at the same temperature and I can not visualize any thermal bridges. .. In summer, temperature differences are not as important as in winter ...
that's because you imagine that the cold enters a building. Outside a thermal bridge it is not that (in winter it is not the cold that enters but the heat that leaves ...) Error of conventional reasoning.
In summer thermal bridges are often manifested by a stack effect (heat accumulation) and an unfavorable phase shift because too limited: which is your case.
ojal wrote:I can not for the moment consider an insulation by the outside, nor to modify the insulation of the walls ...
The tracks that I have to ventilate the attic to lower the temperature since it must go up very high, but is it useful ???
What do you want ... the laws of physics do not have the virtue of adapting to people's wishes, you have to live with them! It is the ITE the only serious solution to this problem (or else you must try to condemn the attic by dispersing 30cm of cellulose wadding on the ground and condemn / isolate the access itou, but that will not prevent the effect. stack of the walls, because the heat also penetrates there in the lower floors since you must have only a weak thermal resistance R <2, which is very insufficient). Otherwise you could be satisfied with an ITE (panel of Compressed LDV) covering the walls of the attic and descending one meter below the attic floor, and a good 30 cm of LDV under the roof, I only see that. But in the absence of a proper ETI, it will remain a thermal strainer, alas.
And what would it be worth to spend in insulation that would not be positioned wisely? It would be wasteful