How harmful is condensation in the attic?
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A common mistake when arranging an attic is incorrect calculation and installation of vapor barrier. In this case, condensation appears in the room, which spoils the microclimate and leads to deformation of the rafters. The main negative consequences of this phenomenon are as follows:
- penetration of moisture into the insulation, which ceases to retain heat;
- damage to wooden structures, on which fungus develops;
- the appearance of mold, which causes allergies.
There is also damage to the interior lining and corrosion processes begin on metal elements.
Why does condensation appear in the attic: the main reasons
The main reason for the appearance of condensation in the room is the interaction of moist warm air from the room with cold surfaces. This occurs due to violation of ventilation rules, insufficient thermal insulation and defects in the roofing pie. Briefly, these errors can be described as follows:
- the vapor barrier film is laid loosely, with tears, or is poorly fixed with glue;
- there is no ventilation gap between the insulation and the roofing material;
- poor-quality roof insulation - there are "cold bridges", as a result of which the roof surface freezes strongly;
- insufficient roof ventilation due to the lack of special grilles, dormer windows and improper air circulation.
Another reason is problems with dormer windows that are installed without following the technology.
How to avoid condensation in the attic: basic rules
The main tips that will help avoid problems with the attic roof cake are as follows:
- Creating reliable vapor barrier for the attic. There should be a vapor barrier film on the side of the living space, the joints of which and the fit to the walls should be carefully glued.
- Forming layers of waterproofing and under-roof ventilation of the roof. It is advisable to install a superdiffusion membrane on the outside. At the same time, a ventilation gap should be left between them and the roof.
- High-quality insulation of the roof. For this process, foam plastic, mineral wool, glass wool or polyurethane foam is chosen. Basalt wool has also proven itself well. The insulation layer is recommended to be no less than 200-250 mm - only in this way can freezing be prevented.
Attic insulation: tips on how to avoid condensation
Attic insulation is an ideal solution to make this room as comfortable and convenient as possible for users at any time of the year. This process consists of several stages, the very first of which is surface preparation. After cleaning it, it is necessary to proceed as follows:
- installation of attic insulation - it is laid around the entire perimeter of the walls, floor, gable;
- formation of a roofing membrane on the outside of the insulation and a vapor barrier - on the inside;
- ensuring attic ventilation - installation of special waterproofing membranes and films, formation of gaps for ventilation;
- fixation of the insulation to prevent the formation of cold bridges.
Finally, decorative finishing is carried out. Materials can be fixed both on the rafters and on the counter-lattice.
If condensation appears in the attic after insulation - what to do?
If condensation is observed even after insulation work, it means that mistakes were made in the process of vapor barrier, ridge ventilation, or the master did not make air gaps. To correct the situation, you need to:
- check the vapor barrier and the tightness of its seams;
- ensure ventilation - the distance between the layers of insulation and roofing material should be 3-5 cm;
- install ventilation - it is necessary to maintain an optimal humidity level in the room (no more than 45-55%).
It is also important to ensure that air enters the room through the eaves vents and it is advisable to make an extractor.
A well-insulated attic is not only the absence of condensation, but also effective preservation of heat in winter and coolness in summer. Find the best solution for your home, and the specialists of RBC ALBA LLC will help you implement any project.
