To explain this common building defect, we will summarize the most common cases and provide a concrete example. This deficiency basically consists of the growth of plant organisms in the interior part of the envelope of our buildings. This can lead to health problems and harm the health of building occupants, leading to respiratory and allergy problems.
CHARACTERIZATION OF SYMPTOMS
Mold is a symptom of a constructive pathology and not a constructive pathology in itself. That is why the treatment of mold will be based first on finding the cause of its appearance. It is usually due to persistent surface condensation caused by these deficiencies:
- Thermal bridges or absence of thermal insulation
- Insufficient ventilation, excessive tightness of the system
- Excess steam production
A very common mistake is to believe that mold on facades appears through leaks and apply waterproof products to facades
It is observed that these lesions manifest themselves in the two bedrooms studied in a sensibly symmetrical way: we found them both on the ceiling, in the area where the slab (roof) meets the dividing wall (separation wall between neighboring houses). They both have a similar “constellation” shape and greenish color.
It is observed that in the East bedroom, the aforementioned lesion becomes larger and more intense in terms of size and color in proximity to the façade. In the West bedroom, the aforementioned lesion is located along the entire wall as well as in the East bedroom, on the ceiling where it meets the dividing wall. We can distinguish three types of shapes: a linear concentration on the edge between the facade and the dividing wall, isolated isolated appearances on the roof, and a linear appearance on the perimeter of the window.
It is observed that the texture, shape and color of the stains is characteristic of the presence of mold.
After studying all the sources, the technician is preparing to issue some technical conclusions:
This technician considers that the appearance of moisture from condensation and mold on the ceilings of the East and West bedrooms on the upper floor of the building affect the minimum required health and habitability conditions and are due to the conjunction of these factors:
- The space under the roof, the vertical facing of the facade is insufficiently insulated.
- The slab in the meeting with the facade configures a thermal bridge that does not favor good thermal conditioning.
- The dividing walls in the meeting with the façade configure thermal bridges that do not favor good thermal conditioning.
- In windows the support piece of the sill probably sets up a thermal bridge. The insulation of the facade does not have continuity with the piece of carpentry and the piece of windowsill does have continuity to the interior.
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