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Condensation – Causes and Cures

What is condensation and why is it a problem now?

One of the biggest points of confusion for homeowners, tenants and landlords suffering from mould in their property is the cause. Black mould on your walls is likely to be the result of condensation and high humidity. But what exactly is condensation, and why does it seem to be much more common now?

image of water vapour condensing on glass due to condensation

Running windows? That’s condensation

Our MD Bryan Hindle briefly explains “Our modern lifestyle differs greatly from that in the middle of the 20th century (when most houses were built). People back then didn’t have the luxury of hot water 24/7, at the flick of a switch. Showering every day was unheard of, most people wore the same shirt for several days – rather than changing every day, as is common now. All this extra laundry and washing creates a huge amount of water vapour. Houses used to have open chimney flues and draughty window frames – they didn’t have double glazing and were well ventilated – water vapour didn’t build-up and mould was only ever found on cheese and bread.  The rush to save energy means those chimneys are blocked-up and our houses are nowhere near as draughty as they were – in fact we strive to make them airtight.  The growth in mould and condensation problems is a direct result of these changes“.

Full details are outlined below, though if you’d rather speak to our friendly team you can do so, just call your local phone line”  Leeds 265 2752 York 566577 or Sheffield 224 5121 “or email my team”  via our contact page


 Need help with mould? This is what we can do…

We’ll carry out a thorough damp survey to establish the real cause of the problem. This will include a detailed assessment of the ventilation and heating regime, as well as a full inspection to find any underlying factors. Our qualified and experienced damp surveyors will get to the bottom of the problem for you. We have a thorough understanding of the science of the indoor environment. We’ll provide a written report, with clear advice on what is causing the mould and how to get rid of it for good.

thermal image of condensation happening in a house in Leeds

Our qualified thermography experts use the technology to ‘see’ condensation as it happens (a private residential let in Leeds).

Advanced internal and external environmental monitoring using the latest state-of-the-art equipment, enables us to see what is really happening. We also have thermal imaging cameras, hygrometers, calibrated air flow anemometers and the best available moisture meters too. Together with our surveyors skill, these tools allow unrivalled technical appraisal of damp houses.

We’ll ask you lots of questions to find out how you want to live and what needs to be done to enable that to continue, without the mould and condensation you’re putting up with now.


image of a humidity plot from a damp house in York

In our damp diagnosis lab we can plot what is really happening to the humidity in your house – 24/7

Condensation and Mould advice for Landlords and Tenants

We also have the qualifications and experience to help in legal cases (or help avoid them), where disputes between tenants and landlords require expert advice and sound proven solutions. We are not ‘hired guns’ who favour one side of the argument or another. We will always issue a factual, accurate and impartial damp report, so that both parties can rely on the advice we give and reach a satisfactory way forward.

If you’re not sure if your problem is condensation or an underlying type of damp, please feel free to call us 0113 265 2752 – York  01904 566577 – Sheffield 0114 224 5121 or email us via our contact page

Condensation problems – some facts on black mould.

Condensation can cause more problems than water droplets running down the inside of your windows on a cold winter’s morning. The biggest problem is black mould – although despite the name it can sometimes appear green or white – which looks horrible, can damage decor and belongings, and isn’t great for your health either.

Here are a few facts about mould:

  • It’s most commonly found in wardrobes, on the interior of external walls, in bathrooms, on clothing or soft furnishings that are close to these areas
  • When walls are affected it often occurs in corners and behind furniture

    mould on a York bathroom ceiling

    Mould is almost always the result of the internal environment… so what is wrong?

  • It can grow on paint and wallpaper, causing stains and unsightly marks that will require redecorating to solve
  • Even if you get rid of it, it’ll keep coming back if you don’t treat the root cause!
  • It’s NOT usually a sign of rising or penetrating damp

If you notice water dripping down, or sitting on your walls or windows, this is very likely to be caused by condensation, and may lead to (or have already caused) mould growth. So it’s clear – you can control mould growth by curing the condensation.

How to help reduce condensation yourself

It’s not always immediately obvious what’s causing your condensation problems, and it might be that you need one of our damp experts to help identify the root issue, but there are a few things you can do to reduce the likelihood of it occurring, or to treat any existing condensation problems:

  • Ensure any air vents or air bricks are open and not obstructed
  • Use extractor fans in bathrooms and kitchens – consider having them fitted if you don’t already have them
  • Avoid drying clothes indoors if possible, especially directly on radiators
  • Use lids on cooking pans
  • Close the bathroom door and open the window a little when bathing or showering

    image of black mould in a house in Leeds

    Mould on a bedroom wall in Leeds

  • Insulate roofs and walls if not already done
  • Don’t switch radiators  off in unused rooms – turn the thermostat down to a lower setting so that you’re not wasting too much power, but are getting a little warmth running through the space
  • Open windows or the door to unused rooms occasionally to let the air circulate
  • Use anti-mould paint in trouble areas, such as the bathroom or kitchen

Call our customer service teams locally on Leeds  0113 265 2752 – York  01904 566577 – Sheffield 0114 224 5121 or email us via our contact page


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