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Repairing damage caused by mould fungi

Sanierung Schimmelpilzschaeden

Mould fungi are an indispensable part of the natural cycle of substances. For this reason, the elements can be found everywhere. We live in permanent contact with air-borne mould spores. There are move than 100,000 different types of fungi, however, not every (mould) fungus is injurious to health - some (mould) fungi are very useful even.

But, mould fungi do not belong into our houses ! After all, mould fungi may be hazardous to health, and constitute a hygiene problem. The bandwidth of complaints goes from simple mood disorders to life-threatening symptoms in case of immunodeficiency. Only by means of a correct refurbishment, health risks are prevented, and the restores a room air quality without mould infestation.

Phase (1): Recognising and removing cause
The recognition and removal of any humidity problems is an important prerequisite for a permanently successful mould remediation. The professional measurement technique of HEYLO, such as HFM 200, the MMS 2 moisture analyser or the Surveymaster, are indispensable for the diagnosis of material and air humidity.

By using technical drying units, the material as well as the air humidity can be reduced to a normal level within a very short period of time. HEYLO offers the complete band width here: dehumidifiers with 22,4 l / 24 h up to  75 l/ 24 h.

Beforehand any affected materials, such as wall-paper and MDF skirting boards, should be removed because the start of drying will considerably encourage the spread of spores. By applying disinfectants, such as Odox or Alron Citrox, by means of a ULV sprayer, the spread of germs is minimised.

Phase (2): Dismantling and cleaning
Active infestation of materials, which cannot be cleaned, required dismantling. In this case, the dust pollution of the air has to be minimised by suitable measures. Electric tools, such as plaster milling machines, have to be fitted with a dust extraction system. More contaminated rooms should be isolated against uncontaminated rooms by means of a dust control wall (HEYLO HEYWALL), dust protection swing door (HEYLO DCD swing) or a dust control system (HEYLO DCS). This may be sensible before drying already.

Whilst breaking down and fine cleaning, the use of low pressure devices is recommended. Mobile air filters, such as HEYLO PowerFilter with HEPA H14 filters, are used to reduce the concentration of spores.

Invisible spores floating in indoor air are killed off by the nebulisation of the room volume with special active substances. By this way, areas very difficult to access are reached as well. Spores killed off may be allergenic as well, and for this reason all surfaces in the refurbishment area have to be cleaned of adhering spores by using industrial vacuum cleaners of the H class and by wiping. If a clearance measurement for renovation check is required, the measures for air purification and fine purification have to be carried out very carefully and timely.

Phase (3): Restoration and prevention
Penetrox active substance is applied prophylactically on absorbent surfaces, such as plaster or wood, in which a depth penetration is requested. Persistent adhering mouldy odour can be removed by nebulising active substances, such as Dry Odour Control, by using Thermofoggers for odour neutralisation.

For restoration, building materials and coatings insensitive as possible should be used which prevent a re-colonisation of surfaces. The specialist trade can provide a number of suitable building materials. If the damage caused by mould was due to a lack of airing, the user should be provided with a hydro-thermometer, such as Hygrothermometer, for self-monitoring. If the building conditions do not permit sufficient airing, the permanent use of a hygrostat-controlled dehumidifier, such as HEYLO DT 650, can be recommended also as a preventive measure.

Which measures are required to remove the respective damage has to be determined in the individual case. The measure selected should always be in conformity with the legal specifications (German Ordinance on Hazardous Substances (GefStoffV), German Ordinance on Biological Working Agents (BioStoffV) for mould fungus restoration.

The German Employers’ Liability Insurance Association (BGI858) and the German Federal Environment Agency (Guideline for Mould Fungus Restoration) render information free of charge. Please also observe the corresponding instructions for use and safety data sheets of the products used.

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