- News Article
Don't Ignore Mould In The Home
12 March 2025
12 March 2025
There are many different varieties of mould that grow in an array of colours such as green, black, white, orange and blue. Some strains of mould are more harmful than others, and one particular strain of mould can grow in a variety of colours, depending on different circumstances. This makes it difficult to identify exactly which strain of mould is growing in your home, and therefore it is hard to determine whether or not you should be worried. Generally, it is best to get rid of all kinds of mould, before it spreads and either you or your family members become ill.
\r\n\r\nThe most common types of mould that grow in the home are the black and green varieties.
\r\n\r\nGreen mould may be indicative of Cladosporium, Aspergillus or Penicillium mould. Not only does mould look unsightly, but it can eat away at your paint and damage it while releasing potentially hazardous spores into the air. Kill green mould on your wall to eliminate these cosmetic, structural and respiratory risks.
\r\n\r\nGreen mould is very common in many houses in the UK and typically belongs to the aspergillus, cladosporium or penicillium families. Green mould can usually look 'fluffy' in appearance and can often be found growing on damp walls, inside cupboards and carpets and on damp fabrics and mattresses.
\r\n\r\nPenicillium can cause sinus infections and inflammation of the lungs, whereas other strains of green mould can cause bronchitis and even pneumonia if left untreated.
\r\n\r\nLikewise, white mould is often described as almost furry in look especially when found on damp wood. White mould is often found in cool, damp environments such as in basements, cellars and usually growing up a wall. White mould is often overlook as it can look like efflorescence.
\r\n\r\nEfflorescence is a crystalline deposit of salts often seen on the surface of concrete or brick work. It occurs when water leaves behind salt deposits you can differentiate the two by spraying water on the surface. If the residue doesn’t dissolve it is white mould. Efflorescence occurs when water moves through a masonry structure, bringing unbounded salts to the surface. When the water evaporates, a white, fluffy structure is left behind. This growth, while harmless, can appear very similar to white mould growth.
\r\n\r\nBlue mould is another common household mould that usually appears in wetter rooms like bathrooms and again usually on walls rising up to ceilings. Steam from showers and bathing is the optimum moist environment for mould to grow.
\r\n\r\nAll kinds of mould can be harmful to health, however, black mould is famously the one to watch out for. Most black moulds are fairly common and often come from the same strain as green mould. They can be treated with normal treatment methods, and are not to be a cause of great concern. Stachybotrys chartarum, also known as black mould or toxic black mould, is a variety of microfungus that produces its conidia in slime heads. It is sometimes found in soil and grain, but the mould is most often detected in cellulose-rich building materials from damp or water-damaged buildings.
\r\n\r\nThere is, however, a particularly difficult type of black mould known as ‘toxic black mould’ or ‘stachybotrys’, which can have much more serious implications on your health.
\r\n\r\nThe growth of black mould growth on bathroom ceilings and walls is a sign of condensation, and in bathrooms there is generally plenty of that! The warm, air laden with moisture comes into contact with a cold surface and that cools the air so that it can no longer hold the moisture which then condenses on that surface. This is why condensation is typically found on windows and other colder areas.
\r\n\r\nBathroom ceilings covered in mould have long been a source of concern for our users. There are three ways to stop the condensation and therefore the likelihood of mould growth:
\r\n\r\nThere is no avoiding the moist air in a bathroom so it is virtually impossible to reduce the moisture content in the air. Ventilation can be effective and an efficient extractor fan will help reduce condensation enormously and therefore the likelihood of mould growth. Other ventilation such as opening a window may not be practical especially in winter when it will make the bathroom very uncomfortable. Improving heating and insulation may be expensive and potentially unaffordable in the circumstances, but they are an option.
\r\n\r\nThis means that condensation and black mould are most often found in bathrooms, particularly those that are poorly heated and ventilated and especially when insulation properties are poor making the ceiling a particularly cold surface. When this is the case and mould has started to grow it is very difficult to stop it.
\r\n\r\nToxic black mould and less harmful black mould look very similar, which can make the degree of severity of your problem difficult to ascertain. Toxic black mould tends to be a greenish-black and is often slimy, however, it can also become dry and powdery over time.
\r\n\r\nIt requires a high cellulose and low nitrogen compositional surface on which to grow, and also requires more moisture than other strains of mould. It is often found in and around particularly damp areas and is a particular problem in areas which have sprung leaks that are hidden from view, such as inside walls or in floors and ceilings. Deformed walls and peeling patches of paint are key things to look out for, as they are indicators of internal dampness.
\r\n\r\nIf you discover an area of mould in your home that suspect may be toxic, the only way to properly identify it is to enlist a professional mould inspector, who will look at it using a microscope.
\r\n\r\nThere is no one cure for mould due to the variety and level of severity the mould is and some require professional removal. For example if you have a problem with toxic mould, then you need to seek professional treatment in order to ensure that your home is a safe environment for you and your family. If you find a colony of toxic mould, it is very important that you do not disturb it. Touching or moving the mould can cause an enormous amount of harmful spores to be released in the air, to the detriment of you and the people you share your home with.
\r\n\r\nFor other, more common strains of mould, there is a wide variety of mould treatments available that clean the mould, which are easy to use on your own.
\r\n\r\nFirst, you must thoroughly clean your walls before getting rid of the black mould located on it. To do this, you'll need to use warm water with a mild soap brand. Next, pour the mixture into a spray bottle and apply it to the walls containing the mould. Use a sponge or a scrub brush to clean the walls completely.
\r\n\r\nA simple solution for removing non-toxic mould from your home is to clean it using a non-toxic, mould cleaning solution. When the mould has been eradicated, it is important to dry the surface thoroughly, in order to prevent the mould from returning.
\r\n\r\nAnother simple yet short-term solution is to kill the mould and nasty marks on your walls with bleach. If you do wish to try this tactic remember to wear thick clothes (you don't mind getting ruined), rubber gloves and a face guard as both the mould and bleach fumes can be dangerous to inhale. To clean mould off your walls, follow these steps -
\r\n\r\nRemember however, this is not a long term solution and you really need to tackle the cause of the mould to ensure it doesn't come back. If the mould is as a result of sewage or floodwater you should not remove this yourself as it can be harmful to your health. It is best to seek a professional as the area will need to be treated and disinfected.
\r\n\r\nRemoving mould from an exterior wall is different to an interior as you are often dealing with exposed brickwork or plaster outside whilst inside most walls will be wallpapered or painted.
\r\n\r\nFirstly, shoot down the wall with a pressure washer's fan spray. Use smooth, even strokes to cover the entirety of the wall, not just the area on which you notice mould growth. This forcefully removes most of the mould spores from your wall's paint and crevices. If you don't have a pressure washer, use a garden hose with a sprayer attachment to rinse the wall as best you can.
\r\n\r\nNext, create a mould-killing solution. Pour a gallon of warm water into a plastic bucket. Mix in 1/2 cup of household bleach and 1/4 cup of standard powdered laundry detergent. Stir thoroughly. Mix in 1/2 cup of trisodium phosphate, a cleaning agent available at many hardware stores.
\r\n\r\nSponge the solution onto the green mould growth. If the mould growth is widespread, you may wish to use a garden sprayer, such as the type used to spray herbicides or liquid fertilisers. Allow the solution to soak on the wall for 15 minutes, during which time the bleach will sterilise the surface and kill the mould.
\r\n\r\nScrub the wall with a sponge. While the mould may be dead, some staining and mould growth may still be visible. The trisodium phosphate and laundry detergent will help loosen any mould stains.
\r\n\r\nRinse the wall by shooting it down with a water hose. Let the wall dry thoroughly, which may take 24 hours or more depending on your climate.
\r\n\r\nThere are various ways of identifying mould in your bathroom. Remember, mould forms from the inside out, so if you can see it, the issue may already be severe and will need fixing as soon as possible. Below are tell-tale signs of mould forming in your bathroom:
\r\n\r\nBathroom mould isn’t always obvious. Check out hidden areas, such as under sinks, access doors to shower and bath fixtures, around exhaust fans, even in crawl spaces and basements underneath bathrooms.
\r\n\r\nTo remove mould from a bathroom -
\r\n\r\nWhen dealing with bathroom mould, bleach products such as Domestos, are the best removal methods. However, when it comes to wardrobes, bleach may not be appropriate for a particular material, or for a delicate wood or finish. Even when diluted, bleach is a very strong substance, and it could eat away at the protective gloss on your wardrobe, create damage to the wood, or cause discolouration. For wooden surfaces and vulnerable materials, it’s always best to use as gentle a cleaning solution as possible. This is why preventing mould in wardrobes takes a little extra care.
\r\n\r\nMould in wardrobes derives from two main factors: condensation and damp clothing. The first step in stopping mould is removing any mould that is already present in your wardrobe. An alternative to using bleach on wooden surfaces is to use white vinegar. Always test any product in a small area first before continuing.
\r\n\r\nNow, you’ll want to employ some simple prevention tactics:
\r\n\r\nMany black moulds are toxigenic, meaning that they release toxins that can be irritating or even harmful for people who have preexisting conditions. Called mycotoxins, they're produced as mould spores eat, grow, and form colonies with other spores.
\r\n\r\nThe majority of moulds found in the home are caused by excess moisture, usually this is due to high humidity levels in the property but it could also be caused by leaking pipes, rising damp, rain seeping in due to a damaged roof or window frame. In new build properties you may start to notice excess moisture and even mould due to the property not drying out yet. It is important to remove the mould problems in your home as soon as possible as left untreated it can soon become a health risks to those living in the property.
\r\n\r\nStachybotrys, or toxic black mould, is harmful in the home because it produces mycotoxins. Mycotoxins are invisible to the human eye but can enter the human body through inhalation, ingestion and even through the eyes. These mycotoxins are very dangerous and can cause problems with the reproductive system, vision, skin, the circulatory and respiratory systems and can even have psychological and neurological effects.
\r\n\r\nSome mycotoxins cause immune system responses that vary considerably, depending on the individual. The duration of exposure, the frequency of exposure and the concentration of the insult (exposure) are elements in triggering immune system response.If you are experiencing worrying symptoms and cannot identify the cause, it is important to check your house for signs of black mould.
\r\n\r\nIf your home has experienced damp you are quite likely to have, unfortunately suffered with mould mites. Mould mites are closely related to dust mites, like dust mites they can be difficult to see with the naked eye. Mould mites feed on mould and love damp conditions, if you are experiencing any issues with damp you are likely to fid an infestation of mites soon after.
\r\n\r\nAlthough mould mites can't bite or cause grievous harm they can cause an allergic reaction or worsen some-one who is already susceptible to allergies and irritants. They multiple quickly so you need to act fast to remove them. Most importantly is to remove all mould from your home, depending on the severity you may need professional help. Then ensure your property has been properly deep cleaned and all traces of mould such as; soft furnishings or bedding has been removed.
\r\n\r\nOnce removed you need to ensure your home stays mould free, in order to keep the mites away. The best way to do this is to adequately ventilate your home at all times, you can also use anti-allergy bedding to protect mattresses, duvets and pillows from mould spores and mites.
\r\n\r\nThere's no complete cure for allergic rhinitis caused by a mould allergy, however there are a number of medications can ease your symptoms. For example;
\r\n\r\nIf you are experiencing symptoms due to toxic black mould, the only way to treat it is by removing either the mould or yourself from the environment. Over time, your symptoms should begin to disappear, however, some damage can be harder to resolve which is why it is important to monitor any changes in your home especially on the walls and ceilings. Then if you notice any changes, treat the mould as soon as possible.
\r\n\r\nIn addition to ventilation and heat retention products, it is also important to ensure that your home is well cared for in other ways, in order to prevent unnecessary moisture which causes mould and mildew to appear in the first place.
\r\n\r\n1) Check to see if your windows are allowing rain to seep in and if the sealant around them is damaged. Additionally check there is no damage to your roof as this could also allow rain to seep in and damage the interior of your property.
\r\n\r\n2) Always make sure that you dry wet areas immediately. Wipe up spillages and make sure to dry floors and walls after you take a bath or shower. If possible, dry wet clothes outside or in a dryer rather than on radiators, as the moisture from your clothes travels straight into the air. Never leave wet clothes in the washing machine and replace water-damaged carpets and fabrics immediately.
\r\n\r\n3) There are a lot of products available to aid with mould prevention, such as mould sprays and mould prevention paint. If you are having building work completed in your home, it is possible to obtain mould-resistant drywall or gypsum board, which is designed to prevent moisture within the structure of your home.
\r\n\r\n4) A good way to monitor humidity in your home is through a moisture meter, which can be bought from most good DIY stores. Ideally, humidity should be between 30 and 60 percent.
\r\n\r\n5) Although indoor plants improve the air quality of your home, moist soil and leaves also provide the perfect breeding ground for mould. Make sure you clean and move your plants around regularly, in order to prevent a build-up of mould.
\r\n\r\n6) Leaks are commonly caused by broken gutters or drainpipes. Make sure to inspect the exterior of your house regularly, in order to prevent a simply cracked drainpipe from becoming a larger and more expensive problem.
\r\n\r\n7) Finally, it is important to let air circulate through your home. Keep internal doors open as much as possible and move the furniture away from walls. Open windows on dry days to let air blow into your home from outdoors which will reduce moisture and therefore help to prevent mould.
\r\n\r\nOnce you have treated your mould or mildew, it is important to make some changes to the way your room is ventilated, in order to prevent further outbreaks.
\r\n\r\nAt EnviroVent, we have a range of products that can help to keep your home well-ventilated and mould free. For badly-ventilated kitchens and bathrooms, it is definitely worth installing an extractor fan, such as our Cyclone 8. It effectively tracks and detects water vapour in the atmosphere and comes with an 8-year guarantee, so you can relax in the knowledge that your home is a safe and spore-free environment.
\r\n\r\nWe also have a range of condensation control units to suit your individual needs. Our whole house ventilation systems remove moisture and dampness from the air caused by cold in the winter, and will also work to cool rooms down in the summer, preventing water vapour caused by humidity. We have condensation control units specifically designed for loft spaces and flats and apartments, as well as more traditional houses.
\r\n\r\nIf you want to improve the indoor air quality in your home, we recommend our single room heat recovery unit. Using state-of-the-art technology, it simultaneously retains heat within your home and provides air from outside through internal tubes, meaning that you can feel the benefits of opening your windows without increasing your chances of condensation.
\r\n\r\nAll of our products are energy efficient and make your home a more eco-friendly place by utilising the air up to 75% more than under ordinary circumstances.
One of our local experts will contact you to learn more about your problems, offer free expert advice and make recommendations for a solution.
\r\n\r\nDuring the free survey we will
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