History of Mould contamination
Selby, North Yorkshire was home to our next project a two-storey residential property with a history of mould contamination. The current owners of the property had occupied the property for approximately 3 months, when they reported mould growth to the skirting boards in the storage cupboard located under the stairs. They immediately removed the mould contamination by cleaning and noted that no further evidence of mould contamination had been found in other areas of the property. None of the occupants reported suffering any adverse health issued which could be attributed to the building environment.
What did the mould survey consist of?
Our surveyor made his way around the property, visually inspecting areas, taking samples and measuring the moisture within materials. He took samples of airborne moulds onto Vesta Spore trap cassettes using a High flow 1600 air sampling pump. In a period of 10 minutes a total volume of 200 litres were collected.
Armed with a Hydromette HB30 Moisture Meter and a Tramex Moisture Encounter plus, our surveyor could begin the moisture mapping process. Using this specialist equipment he is able to locate areas with elevated moisture levels, evaluate the extent of the moisture and he is able to recommend the appropriate remediation measures.
Results of air monitoring and moisture mapping
Air monitoring revealed that the indoor air is not affected by an elevated number of fungal spores as the composition of identified fungal general is indicative of normal conditions. Therefore the indoor air quality of the property can be described as good.
Visual inspection and moisture mapping revealed that the property is not affected by rising, penetrating damp or condensation. We conducted a thorough investigation in the storage cupboard under the stairs as this was the main area of concern for the client. The cupboard itself was approximately 1x1x1.2 meters with carpet to concrete screed floor. There was no evidence of water damage or mould contamination to the carpet, however the skirting boards were showing marginally elevated moisture content in comparison to the skirt boards throughout the rest of the property.
Our surveyor believes that the root cause of the mould contamination to the skirting boards in the storage cupboard was a lack of ventilation. The humidity inside the cupboard originates from the drying construction materials, this paired with the lack of ventilation resulted in surface mould contamination to the skirting boards. In order to encourage ventilation and prevent the reoccurrence of fungal growth, we recommend the client installs a passive vent to the cupboard door.