Solving problems with a damp roof and roofing.
The formation of dampness under the roof can have two main causes, on the one hand, due to precipitation, on the other hand, from excessive humidity inside the house. In order for the roof to fulfill its immediate functions and reliably protect the building from various atmospheric precipitation, it is not enough high-quality roofing that effective ventilation and competent execution of work on the arrangement of the “roofing pie” are necessary.
How can dampness be prevented under the roof?
Houses with an attic.
With this arrangement of the roof, the slopes of the roof are usually insulated. In this case, it is necessary to protect the heat-insulating layer both from water, which can enter as a result of existing defects in the roofing, and from moist air that enters from the house. As you can see, in this case it is necessary to use a hydro- and vapor barrier film, while at the same time it is necessary to ensure sufficient ventilation of the roof slopes.
House with a non-residential attic.
With this roof device, it is not the roof slopes that should be insulated, but the attic floor. In this case, it is necessary to perform not only roofing with high quality, but also to ensure effective ventilation of the entire attic space. With a gable roof structure, it is necessary to leave special ventilation holes in the gable (gable) walls. If the roof has a rather complex structure and shape, then the ventilation elements should be installed on the roof slopes.
Why do roofs get wet?
Wetting the roof from the outside can occur for the following reasons:
violation of the tightness of the roofing – in case of damage to the roofing material, non-execution or incorrect execution of tin roofing elements.
loose connection of tin roofing elements – due to too long operation or due to their poor quality.
In addition, the roof can be moistened from the inside in cases where:
there is no ventilation in the attic or it has insufficient efficiency. In this case, water vapor will condense from moist air on the lower surface of the roof slope.
when insulating the roof, there is no internal vapor barrier layer. At the same time, moist air can get inside the roof structure, which, condensing on the insulating material, moistens it.
In addition to the problems discussed above, moisture under the roof can form for the following reasons:
in the absence of sufficient ventilation inside the insulated “pie” of the roof (lack of exhaust and inlet openings, ventilation gaps). In this case, if water vapor gets inside, it will not be able to evaporate.
when constructing the roof, unsuitable materials not intended for these purposes were used. For example, if, in order to save money, a rather expensive high-quality waterproofing film with a high degree of vapor permeability is replaced with a cheap film with low vapor permeability, then the roof insulation will not be properly protected, which will entail a decrease in its performance. How to get rid of dampness in the roof and roof?
First you need to accurately determine the cause of its occurrence, some of which are easily determined visually:
The presence of streaks on the ceiling and walls. Basically, they indicate the presence of cracks in the roofing, which must be eliminated without fail.
The presence of very high humidity in the attic. This symptom indicates a malfunction or insufficient attic ventilation, which must be taken care of.
Sufficiently low air temperature in the insulated attic.
This sign indicates that the selected thickness of the insulation is not sufficient or that the heat-insulating material is wet, and the moisture in it cannot evaporate. If the reason is the integrity of the roofing, then dismantling the “roofing pie” is indispensable. If the coating is in good condition, then repairs can be easily carried out from inside the house, even if in this case it is necessary to remove the vapor barrier film.
We hope that the problems of dampness under the roof considered in this article will help you avoid such structural errors during the installation and operation of the roof, and the considered methods and methods of dealing with it will effectively get rid of dampness and moisture.