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Heating

Advice on boilers, radiators, central heating systems and keeping your home warm and energy efficient.

Heating

Top Tips: Mould Prevention

Although the cause of mould can vary, it is always fundamentally down to one thing: too much moisture causing growth.

Although the cause of mould can vary, it is always fundamentally down to one thing: too much moisture causing growth.

From poor ventilation to drying washing inside, mould doesn’t need a big excuse to take up residence in your home. It can, however, have serious health consequences so it is important that you know how to deal with – and prevent – the problem.

What is mould?

Mould is a type of fungus that tends to develop in wet and humid settings. It isn’t fussy and can pop up all over your home. Mould tends to vary in appearance but is often black or brown and it gives off a distinct, stale smell. The problem with mould is that, once it develops in your home, it is likely to spread. Mould carries through the air via tiny spores, settling in moist spots such as around windows and in corners of rooms, or areas where external walls are damp because of a leak. Areas like basements, bathrooms, kitchens, and lofts are prime spots for mould, along with materials such as wood, wallpaper, or leather that retain moisture.

Why is mould so bad?

Apart from looking and smelling unpleasant, mould isn’t great for your health, particularly for those with respiratory problems and allergies, as it produces allergens and toxic substances. People who live in mouldy conditions can experience wheezing, sneezing and coughing as well as itchy skin, red, itchy eyes and runny nose.

Getting rid of mould

The problem with mould is that it can keep returning, so conventional cleaning products aren’t enough to fix the problem. Specialist mould removers and anti-fungal sprays are required to get rid of the mould in the first place. If the job seems too daunting or your mould problem is beyond your control, it may be wise to call a professional cleaner or mould specialist to help you to get the problem under control.

Preventing mould

To prevent mould, you need to get a handle on the moisture levels in your home.

  • Improve ventilation by opening windows when you can. Use extractor fans when you are in the bathroom or kitchen, and if condensation continues to be a problem, invest in a dehumidifier.
  • Open the curtains! Mould doesn’t just thrive in the damp, it likes the dark, too. Natural sunlight will help to prevent the build up.
  • Keep on top of leaks – if you notice that a tile is missing or broken, or your render is cracked, call a roofer or builder as soon as you can. Once the damp gets into your property, it is much harder to deal with.
  • Try not to dry laundry inside. That is, of course, easier said than done when it has been wet for months, but drying indoors adds significantly to your humidity. If you must dry indoors, do it in a smaller space, such as your bathroom, with a dehumidifier on, or invest in a heated and covered drying rack.
  • Get a damp survey – if you can’t get the problem under control, get professional advice to help you identify and treat the cause of the problem.

Got any more top tips? Let us know on Facebook or X.

Looking for more heating advice?

Find clear, practical answers to common heating questions, helping homeowners understand everyday issues, know what checks they can carry out safely, and when it is best to contact a qualified professional.

  • What is the difference between a combi boiler and a system boiler?

    A combi heats water straight from the mains on demand - no cylinder needed, which makes it compact and ideal for smaller homes or flats. A system boiler works with a hot water cylinder, storing a ready supply that can serve multiple taps or showers at once without the pressure dropping - better for larger homes with more bathrooms. There's also the conventional boiler, which needs both a cylinder and a cold water tank in the loft - common in older properties. A heating engineer can help you figure out which suits your home best.

  • Is an air source heat pump right for my home?

    Heat pumps pull warmth from the outside air (even when it's cold) and use it to heat your home and hot water. They work best in well-insulated homes, ideally with underfloor heating or larger radiators that work well at lower temperatures. In draughty or poorly insulated properties, the benefits are more limited. The Boiler Upgrade Scheme currently offers a grant of up to £7,500 towards installation, so it's worth getting a professional assessment to see whether your home is a good fit before committing.

  • How often should a boiler be serviced?

    Once a year, by a Gas Safe registered engineer. It keeps the boiler running safely, catches small issues before they become expensive, and is usually a condition of the manufacturer's warranty. Some home insurance policies require proof of regular servicing too. If you're not sure when yours was last done, book one before winter - better to find out before you're sitting in a cold house!

  • Why is my radiator cold at the top but warm at the bottom?

    This issue is almost always trapped air. Bleeding the radiator - using a radiator key to release the air - usually sorts it, and it's one of the few heating jobs you can safely do yourself. If bleeding it doesn't work, or if several radiators are having the same problem, it might be a pressure or pump issue. Worth getting a heating engineer in to have a look.

  • What are the signs my boiler needs replacing?

    Keep an eye out for: frequent breakdowns, energy bills going up without using more heat, unusual noises (banging, kettling, or whistling), a flame that's yellow or orange instead of blue, and any visible leaks or rust around the unit. If your boiler is over fifteen years old and ticking any of those boxes, replacing it is usually the more economical choice - modern boilers are significantly more efficient.

  • Is underfloor heating worth it and do I need a professional to install it?

    For a new build or a big renovation, underfloor heating is often a great investment - it heats rooms more evenly than radiators and can be more efficient, especially alongside a heat pump. Retrofitting in an existing home is more of a job, and how worthwhile it is depends on your floor types and how much disruption you're happy to deal with. Either way - wet or electric - it has to be installed by a qualified professional.

  • Why does my boiler keep losing pressure?

    Some pressure drop over time is normal, but if you're topping it up regularly there's usually a cause: a small leak in the system (which isn't always easy to spot), a pressure relief valve that's releasing water, or air in the system after bleeding radiators. Topping it up via the filling loop is fine as a short-term fix, but if you're doing it more than a couple of times a year, it's worth getting an engineer to look into why it keeps happening.

Have a question about TrustATrader?

If you have a question in relation to TrustATrader specifically, please check out the TrustATrader FAQs, with separate lists tailored to consumers and tradespeople. Alternatively, get in touch with our team. We're happy to help!