We typically see an increase in mould queries at this time of year. This is often due to higher moisture levels from autumn into winter, along with people spending more time indoors and becoming more aware of mould issues.
Mould requires two main conditions to grow: a source of cellulose (such as wood, paper, or fabrics) and moisture. This moisture can come from a range of both obvious and less obvious sources. Below are common ways moisture can be present in your building.
This piece has been written by our Occupational Hygiene Team Leader and Senior Consultant at Chemsafety, Sam McGee, who has over 10 years of experience in the field.
Penetrating Damp
Occurs when moisture or water enters through walls or ceilings rather than rising from below. Common causes include overflowing guttering, driving rain, and vegetation growth. This can lead to wet or dry rot within wall and ceiling cavities, resulting in mould growth that may not be visible for some time.
Internal Leak
Typically caused by a plumbing failure that develops over time—such as a leaking pipe within a wall cavity or around a shower—or by sudden events like sprinkler system activation or a hot water cylinder failure.
Condensation
Condensation is caused by elevated indoor humidity, typically due to poor ventilation. It occurs when moist air comes into contact with cold surfaces and condenses, often appearing as “crying” windows and leading to mildew on windows, curtains, and other surfaces.
Flood
A natural disaster or external event that allows water to enter the property, resulting in significant damage.
Rising Damp
Rising Damp occurs when moisture rises from the ground through brickwork, timber, or other porous materials via capillary action. It is typically prevented by installing an effective damp proof course (DPC).
Contact us for more information and to discuss how we can help your business and workers.