What Causes Mould Behind Cupboards, and What Can You Do About it?

What Causes Mould Behind Cupboards, and What Can You Do About it?

10th February, 2023

Most people are aware of the issue of damp and mould in the home, but many people do not understand how to deal with the problem. While it may seem like an annoyance, mould is actually dangerous. Mould emits pathogenic mycotoxins that can cause serious health problems for a lot of people. To understand how to deal with mould, we need to understand what causes it.

The Appearance of Mould in the Home

Mould is a fungus that emits invisible spores. While you might want to eliminate these spores to ensure mould does not colonise the home, it is not always that easy. Fungi are a part of our ecosystems, so we cannot eliminate them. This is especially true when you consider the fact that mould spores are microscopic, and so we cannot see the mould until it colonises a home.

A mould colony is dark green or black. It is slimy, and it can get messy when you try to clean it. Removing mould from the windows, doors, walls and floor is relatively easy. All you need is some water, bleach, vinegar and a sponge. However, the mould behind a cupboard is a lot trickier. This is because you might not notice it until the colony has started growing, and you would need to do a lot of work to get rid of it. So, what causes mould behind cupboards?

It is Mainly About Air Circulation and Damp in the Home

While it is impossible to eliminate mould and its spores, it is possible to prevent it. You do this by controlling indoor moisture and dampness in a house. The reason it works is that mould thrives in homes that have uncontrolled condensation, high humidity and water leaks or penetration into the home.

The lack of circulation, as is often the case behind many cupboards, allows mould spores to sit for long periods until they grow into mould. This lack of circulation stems from the fact that the area behind the cupboard will be blocked off by the wall behind it and the boards used to build it. The fact that cupboards are also meant to sit for long periods means many people do not clean behind them.

The cause of mould in your bathroom or kitchen is a lack of ventilation when cooking or showering. This lack of ventilation leads to high moisture and humidity levels which provide a conducive environment for mould to thrive. Apart from behind the cupboard in these areas, you might also find mould on the windowsills and behind appliances as the mould spores start to spread inside the home.

Plumbing Issues Causing Mould

Most of your plumbing is installed in the walls and your cupboards are likely installed in front of these walls. If a leak happens inside such walls, the wall will get damp and mould might start growing on it. You might not notice this because the damp area and thus the mould will be hidden by the cupboard.

One way you could tell that there is a leak even if it is hidden is by noticing that the floor feels or looks damp in an area that is away from obvious water sources. If such an issue is realised beside or in front of a cupboard, it is a good idea to check behind the cupboard to see if you have a leak there.

You can also commission additional London damp surveys to find out the cause of the damp floor. Such surveys can even reveal mould in areas other than behind your cupboards.

Dealing with Mould Behind the Cupboard

Before doing anything, it is a good idea to call a damp specialist London to find out if a damp issue is causing the mould in the home. They will advise you on factors like penetrating and rising damp so that you know the next steps to take if there is an issue.

The second thing is dealing with mould. This includes cleaning the area with bleach, water and a detergent. Scrub the area until it is clean and do not be afraid to clean it as many times as you need to until all the mould is gone. Take care not to destroy the paint on the wall. Once you are done cleaning, dry the area with a dry cloth and leave it like that for a bit to ensure it is completely dry.

Sort Out Ventilation Issues

Because poor ventilation is a precursor to mould behind your cupboard and in other areas of the home, you need to ensure that areas likely to have high humidity are properly ventilated. These include the kitchen and the bathroom.

You can install a range hood in the kitchen to remove moisture while you cook. You can also open the doors and windows while you cook or use the shower to let the damp out. If you have to, you can use a fan or install an air conditioning unit in the home. The air conditioning unit, in addition to cleaning the air and removing humidity, can also filter the air and remove mould spores to stop it from growing in the home.

Deal with Damp Issues

Next, you have to deal with the damp issues that are creating a conducive environment for the mould to thrive. This includes finding all potential areas damp could be getting into the home. One common issue is penetrating damp that gets into the home through the walls. Get a property survey so a professional can assess the damage and tell you the next steps.

Also, check that your gutters and downpipes are in good condition. If they are blocked, they could cause water to cascade down the walls instead of being led away from the house. This can cause the walls to be saturated with water leading to damp that causes mould.

Having mould behind your cupboards or anywhere else in the house is not a good thing because mould can be incredibly dangerous. Knowing how to remove the mould and dealing with what made it grow in the first place is critical to prevent a recurrence.

Damp Survey Costs

Transparent pricing with no hidden fees for our independent, unbiased surveys.

Level 1

Level 1

£199 + VAT

What’s included:

  • Inspection of walls
  • Inspection of floors
  • Inspection of ceilings
  • Leak inspection of drains and plumbing
  • Damp information and prevention guide
Level 2

Level 2

£299 + VAT

What’s included:

  • Everything in Level 1
  • Dry rot inspection
  • Wet rot inspection
  • Woodworm inspection
  • Damp information and prevention guide

 Survey Add Ons

Add On 1

£299 + VAT
Lab Analysis Of Plaster

Laboratory analysis Of plaster identifies hygroscopic salts such as chlorides and nitrates. which indicate whether damp is caused by rising groundwater or by plumbing leaks, This testing removes guesswork, allowing the exact source of moisture to be identified so the correct treatment is applied rather than carrying out unnecessary damp-proofing work.

Add to Survey

Add On 2

£299 + VAT
Mould Lab Swab Testing, qPCR on DNA

qPCR DNA mould testing detects microscopic mould spores that are invisible during a normal inspection and van remain hidden behind walls, floors. or inside building rkaterials. It identifies the exact mould species present and the contamination level, allowing hidden mould problems to be confirrned and properly treated before they affect the property or occupants’ health.

Add to Survey

Qualifications: All our surveyors are PCA and CSRT qualified for remedial treatments and also CSSW qualified for structural waterproofing.
Next day report: You will receive the report within 24 hours of the inspection taking place.

These are the tools we use

A damp meter

A damp meter

A damp meter is a diagnostic tool used to detect and measure moisture levels within building materials such as plaster, brick, timber, and concrete.

Borescope camera

Borescope camera

borescope camera is a small inspection camera attached to a flexible semi-rigid cable that allows you to see inside areas that are otherwise inaccessible.

Inspection Drone

Inspection Drone

A drone is a remotely operated aerial device equipped with a camera that allows visual inspection from above without the need for scaffolding or ladder.

Air Humidity Sensor

Air Humidity Sensor

Air humidity sensor measures the amount of moisture present in the air, expressed as relative humidity (RH) in percentage. It helps determine whether indoor conditions are contributing to condensation, mould growth, or damp-related issues.

Thermal Imaging Camera

Thermal Imaging Camera

A thermal imaging camera detects temperature differences on surfaces by using infrared technology to produce a heat map image. In damp investigations, it helps identify cold spots, moisture intrusion, insulation defects, thermal bridging and leaks.

Air Flow Ventilation Detector

Air Flow Ventilation Detector

An air flow ventilation detector measures the movement and volume of air passing through vents, extractor fans, and air bricks. It confirms whether ventilation systems are working properly and achieving adequate air changes within a room. Poor airflow leads to trapped moisture, high humidity, condensation on cold surfaces, and ultimately mould growth.

Mould Swab Test Kit

Mould Swab Test Kit

A mould swab test is carried out to confirm the presence of hidden mould growth and identify the specific species involved. Surface mould is not always visible, especially behind furniture, inside cavities, or within ventilation systems. Laboratory analysis of a swab sample determines whether active mould spores are present and what type they are, which helps assess potential health risks and decide the correct remediation approach rather than relying on visual assumption alone.

Plaster Salt Analysis Lab

Plaster Salt Analysis Lab

Laboratory analysis of plaster is used to identify the type of salts present within the material, typically chlorides and nitrates. The presence and concentration of these salts help determine whether the moisture source is consistent with rising damp, ground contamination, or another forms [sic] of water ingress. such as mains water leak, This removes guesswork and prevents misdiagnosis, ensuring the correct remedial treatment is specified rather than applying unnecessary or ineffective solutions.