Good afternoon, dear guests and subscribers of the "Build for Myself" channel!
When the tenants of the house feel that the house is cold, namely, that the heating system cannot cope with the compensation of the heat loss of the house, then first of all it is required make an audit of the premises for cold bridges and wall ventilation, since, first of all, the cause needs to be eliminated, and not dealt with consequences.
And when we understand and come to the conclusion that nothing can be done, then the last measure remains - this is the insulation of the walls from the inside. But this solution must be performed so that dampness and mold do not form between the insulation and the wall - which will be discussed in this article.
In fact, insulating a room from the inside is an extreme measure that is necessary to keep warm inside the room (if there are no other options).
Why are many people very categorical about insulation from the inside?
The fact is that with this option, the dew point shifts closer to the room, and therefore there is a possibility of locking the thickness of the wall and the appearance of dampness between the insulation and the wall, which cannot be said about the use of insulation from the outside - outside houses.
But where does the moisture at the dew point come from?
Moisture condenses from warm air that tends to escape through the walls at partial pressure when the heating season begins. And the dew point denotes the likely dew point when the vapor in warm air reaches saturation. It is then that moisture appears.
Thus, it can be noted:
If there is no warm air at the dew point -> no steam -> no moisture -> no mold.
This is the key point!
That's why, it is categorically impossible to use vapor-permeable materials as wall insulation from the side of the premises! The vapor-permeable material will absorb moisture within a few weeks and stop working.
And now, we have a task: how to do so as not to let steam into the dew point.
There is only one option: to use insulation that does not allow steam to pass through.
Vapor barrier and mineral wool should also be immediately excluded, since it will never be possible to achieve perfect insulation of the room. We will not be able to get a vacuum between the film, insulation and the wall, and steam will always seep into these cracks.
There are only a few types of heaters that do not allow steam to pass through:
- extruded polystyrene foam;
- foam glass;
- foam plastic (PSB is higher than 35 kg / cubic meter due to porosity).
Thus, if steam is cut off from the side of the room, we automatically avoid the problem of dampness at the dew point. Moisture cannot condense in a material that does not contain moisture.
It is worth repeating that the dew point is the theoretical point at which water can change from a vapor state to a liquid. Therefore, wherever this point is, the absence of air saturated with water in it will never lead to dew loss!
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