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Mullet, a threatening fungus

Mollusk or Serpula lacrimans, also known as house leprosy, is a very aggressive fungus. It represents a real danger for all joinery or even masonry of some buildings. In France, this formidable scourge rages mainly in the northern and western regions. Thus, unlucky owners have had to spend huge sums to eradicate this parasite and save their homes. However, by playing the card of prevention or by treating the problem intelligently at the beginning, it is possible to limit the damage. That's why this week, HandymanDuanche, invite you to fight against the meriller.


Getting to know the merule

Little present in the nature, the merule likes in the buildings humid, obscure and confined. It therefore prefers to colonize old and poorly ventilated dwellings. The presence of this fungus usually manifests as a thick, white substance, resembling cotton or a spider's web. It can also take the form of a reddish-brown spore. With an exponential growth, the merule can grow 4 mm per day and measure up to several meters. It is sometimes enough for a spore brought back by the wind or the rain, the animals or on clothes so that the mushroom is deposited on wood and invest the places, spreading quickly to the frame and the masonry of a House. In addition, through terraced houses, the merule can easily move from one dwelling to another, thus contaminating whole communities. Measures are therefore needed in old buildings to prevent outbreaks of red blood cells.

Preventing sightings

Mullet, a threatening fungus: fungus

The presence of mullet is not inevitable in old housing. In order to protect yourself, you must act on the structure of the building by eliminating sources of moisture such as: roof leaks or leaking water pipes. In addition, it is essential to improve ventilation of the housing by properly ventilating all parts, for example by installing a controlled mechanical ventilation system (VMC) in the most humid rooms. It is also important to avoid storing wood waste in cellars or damp and poorly ventilated storage rooms, but also to limit as much as possible the presence of plants against the house. It is also conceivable to treat the wood against the merule preventively, for example with boron salt. Finally, before investing in old stone, it is better to have an expert make a professional assessment to ensure the absence of these devastating fungi.

Fight against the merule

If you notice strange white, red or ocher dust spots, the presence of cottony filaments in the walls and woodwork, the smell of mold or if your woodwork seems to be deteriorating for no apparent reason, the merule may already be present in your accommodation. Here, the slightest doubt is not allowed! It is therefore imperative to confirm as soon as possible the presence or not of these mushrooms by professionals. In the case where the marrow has indeed colonized your home, drastic measures are required. You will then have to carry out a second parasitic expertise so that the expert helps you to put in place a solid plan of attack.

The woods attacked by the merule will generally have to be decontaminated, removed and then incinerated. A site that can be very large if the frame is reached. The same goes for the walls, which will certainly be cleaned, brushed and treated with a suitable product. Namely, moisture and ventilation issues will also need to be addressed in parallel to prevent reappearance while improving habitat quality.

Finally, we regret that the majority of home insurance policies do not cover the work undertaken following the merule. However, if the victims can prove that it is a water damage that is causing the proliferation of merules, they have a chance of being compensated.


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