Experts in Mould Removal with over 38 years industry experience to get the job done right, first time...

Aspergillus flavus under a microscope

What is Mould?

Mould is a complex but commonly occurring microorganism with thousands of known species. Many of these species are classified as part of the fungal kingdom, though a number of species now fall outside of this domain.

In nature, mould is an important part of our ecosystem as it aids in the ‘recycling’ and breaking down of dead organic material. 

Moulds are ubiquitous in that they exist everywhere and are a common component of home and workplace dust. As mould spores are microscopic, they are only visible to the naked eye when they have grown into large colonies.

All moulds require moisture and some form of organic matter to act as a food source; usually this food source and the age of the colony will determine the colour of the mould, whether it be green, grey, black, brown or another variation.

Mould feeds on cellulose based material such as wood, it commonly attacks timbers or the paper backers on plasterboard that have been saturated with moisture.

Despite its role in nature, mould does become problematic when it proliferates to an excessive level…

black mould on wall

What causes Mould in Properties

When it comes to property, mould is usually identified when it has colonised to such an extent that it has become visible, however certain health conditions can also indicate the presence of mould, even before it has become visible to the human eye. This is especially true for immunocompromised individuals and those with mould allergies.

The presence of mould to this extent will usually be as a result of some form of defect to or within the property which has caused damp or condensation issues and where there is insufficient ventilation.

Common causes for excessive mould growth and presence in properties include:

  • Natural flood events that have breached the property and saturated materials
  • An Escape of Water (EOW) / water leak
  • Lack of sufficient heating and ventilation
  • Rising damp or penetrating damp
  • Structural defects such as degraded / damaged windows, guttering, brick, stonework and mortar joint
mould hyphae

Why is Mould a Problem?

As stated, excessive mould presence in property is usually a sign of some form of underlying problem or defect relating to excess moisture and poor ventilation. Mould problems can vary considerably depending on the root cause of the issue, however it should be noted that within a relatively short time period, the excess moisture and mould growth will continue to degrade your property and contents – the longer the issue is left, the further the damage will spread and the worse it will become, ultimately leading to higher repair bills – timely action is therefore essential.

Further damage to property and contents, excess mould presence can also have a serious affect on human health. Prolonged presence of mould or black mould can seriously affect indoor air quality putting individuals with lung conditions such as asthma, cystic fibrosis and COPD, and those with a weakened immune system most at risk.

Children under 8 years and adults over 70 years are also at higher risk, though it should be noted that mould can have adverse affects on anyone. Common symptoms of mould exposure include respiratory issues, skin rashes, red eyes, a runny nose and sneezing.

mould specialist spraying mould

When you find signs of Mould...

At some point, most homeowners may come across very small traces of mould, for example, in the grout or sealant in kitchens and bathrooms, and these type of issues can often be addressed through normal cleaning routines or by replacing the affected sealant.

More notable mould damage to walls, floors, ceilings, cabinetry and fixtures such as skirtings should be investigated and resolved by a suitably qualified Indoor Environmental Professional (IEP) contractor  such as WHITE KNIGHT.

As a mould remediation specialist, we have developed an extremely robust protocol to handle mould related projects in a safe and controlled way, while ensuring the most successful outcomes for our clients, and most importantly a healthy living and working environment.

Some mould related issues may arise as a result of an insured peril, such as an escape of water or flood event, and in such cases we advise that you contact your property insurance provider. They will be able to advise if the incident / damage is insured and will also be able to advise on next steps.

We are happy to assist with this process and work directly with many leading insurers across the UK.

Be vigilant about mould and act swiftly should you find a mould infestation, using guidance from specialist Indoor Environmental Professionals (IEPs) such as WHITE KNIGHT

Maintain good cleaning routines to prevent the growth of mould, especially in areas exposed to higher moisture and prone to damp issues such as kitchens and bathrooms

If you suspect mould has arisen as a result of an insured peril, contact your property insurance company

If possible, use a thicker grade plastic sheeting to cover over areas affected by mould and seal the edges with a sturdy tape, as a temporary measure to contain mould. 

Once the mould has been covered over, open windows, trickle vents and doors to ventilate the area and allow moisture and humidity to escape. 

Mould will continue to spread if there is any buildup of damp or condensation. 

Don’t ignore signs of mould – prompt action can help to minimise damage, repair bills and health risks

Don’t use aggressive household mould treatments or cleaning products like bleach – they can actually fragment mould spores and make them airborne, compounding the problem

Don’t spray chemicals directly on to the mould – mould spores are very lightweight and can easily become airborne, so the pressure created from spraying will disturb mould spores


Phase 1
Secure zip pole containment & negative air HEPA 
air-scrubbers guarantee no cross contamination 
Phase 2
Health & Safety
High quality PAPR and PPE equipment protects 
our engineers from bio-hazardous particulates 
Phase 3
Hidden Mould
Forensic investigations ensure that all hidden 
mould contamination is identified and removed.
Phase 4
Mould Removal
Certified IICRC specialists follow strict mould 
removal protocols to HSE standards
Phase 5
Total Disinfection
SteraMist® non-toxic medical grade disinfection 
provides the Gold Standard for bio-hazard elimination
Phase 6
Lab Verification
Mycometer surface and air analysis guarantees 
your return to a safe and healthy environment