How moisture can affect your health and your property — and what you can do about it.
Damp & Mould Action and Awareness Week 2026
From 19 to 25 October 2026, Damp & Mould Action and Awareness Week brings homeowners, tenants, landlords and housing professionals together to raise awareness of the causes and consequences of damp and mould in UK homes. The campaign encourages people to recognise the warning signs, report or investigate problems promptly and take practical action before they become more serious.
WWEC Ltd is supporting the week by helping households across Aberystwyth, Ceredigion and Mid Wales understand how effective ventilation and sensible moisture control can reduce condensation and create healthier, more comfortable homes. Damp and mould should never be dismissed as simply a cosmetic issue: early attention can protect both the people living in the property and the building itself.
Damp and mould are common problems in homes across Aberystwyth, Ceredigion and Mid Wales, particularly during colder, wetter months. A few dark spots around a window may seem harmless, but persistent moisture can affect the air you breathe and damage the building. The key is to act early and deal with the cause, rather than simply painting over the visible signs.
What Causes Damp and Mould?
Mould grows where excess moisture remains on surfaces. Common causes include condensation from cooking, showering and drying clothes indoors; leaking pipes or roofs; rainwater entering around windows or walls; rising damp; poor insulation; cold surfaces; and inadequate ventilation. Older properties and exposed coastal homes can be particularly vulnerable, but damp can develop in any building if moisture is not controlled.
How Damp and Mould Can Affect Your Health
Mould releases spores and irritants into the air. According to NHS guidance, living in a damp or mouldy home can increase the likelihood of respiratory problems, infections, allergies and asthma. Symptoms may include coughing, wheezing, sneezing, irritated eyes, a runny nose or skin irritation. Babies, children, older people, people with asthma or allergies, and anyone with a weakened immune system may be more sensitive to its effects. If you are concerned about symptoms, seek advice from a healthcare professional.
The Effect on Your Home
Left untreated, damp can damage paint, plaster, wallpaper, timber, flooring, furniture and personal belongings. Persistent moisture may also point to a leak or defect that will become more expensive to repair over time. Cleaning the surface may improve its appearance temporarily, but mould is likely to return unless the source of moisture is identified and corrected.
Signs You Should Not Ignore
- Black, green or white patches on walls, ceilings or around windows
- A persistent musty smell
- Peeling paint, bubbling plaster or lifting wallpaper
- Condensation that regularly remains on windows and walls
- Cold or damp-feeling surfaces
Practical Steps to Reduce Damp and Mould
- Find the source. Check for plumbing leaks, roof or gutter defects, failed seals and water ingress.
- Use ventilation properly. Run extractor fans when cooking or showering and leave them on afterwards where appropriate.
- Control condensation. Wipe down wet surfaces, use pan lids and avoid drying clothes on radiators where possible.
- Keep the home reasonably warm. Cold surfaces encourage condensation, so steady background heating can help.
- Allow air to circulate. Leave a gap between large furniture and outside walls and avoid blocking air vents.
- Treat visible mould safely. Small areas may be manageable with a suitable mould product, but extensive or recurring growth requires professional advice.
Do Extractor Fans Really Make a Difference?
Yes. Bathrooms, kitchens and utility rooms generate large amounts of moisture, and effective extraction removes humid air before it settles on colder surfaces. However, a fan must be correctly selected, positioned, installed and maintained. A noisy, undersized, blocked or poorly ducted fan may not provide adequate airflow. Modern options include timer, humidity-sensing and continuous-running fans designed to improve ventilation with minimal effort from the homeowner.
Types of Home Ventilation Systems
There is no single ventilation system that suits every property. The right option depends on the home’s age, layout, airtightness, insulation, existing moisture problem and available space for ductwork. The main choices are outlined below.
Natural and Background Ventilation
This includes opening windows, air bricks and trickle vents fitted to windows or walls. These features allow a steady supply of replacement air and help other ventilation systems work correctly. They are simple and quiet, but may not be enough on their own in a home with persistent condensation or high moisture levels. Trickle vents should normally be kept open and unobstructed, including during winter.
Intermittent Extractor Fans
These fans remove moist air directly from individual rooms such as kitchens, bathrooms and utility rooms. They operate when switched on, when a light is used, or for a set period using a timer. Humidity-sensing versions start automatically when moisture levels rise. This is often the most straightforward solution where condensation is concentrated in one or two rooms.
Continuous Extract Ventilation
Continuous extract systems run quietly at a low rate and increase to a boost setting when extra moisture is produced. A decentralised mechanical extract ventilation system, or dMEV, uses individual continuous-running fans in wet rooms. A central mechanical extract ventilation system, or MEV, connects several rooms to one fan unit through ductwork. Both provide more consistent moisture control than fans that rely entirely on occupants switching them on.
Positive Input Ventilation (PIV)
A PIV unit introduces a gentle, continuous supply of filtered air, usually from a loft unit through a central ceiling diffuser. This slightly raises the air pressure inside the property and encourages stale, moisture-laden air to leave through natural gaps and purpose-made vents. PIV can be useful for whole-home condensation in suitable existing properties, particularly where a loft is available. It does not recover heat and should not be treated as a replacement for effective extraction at the source in kitchens and bathrooms.
Mechanical Ventilation with Heat Recovery (MVHR)
MVHR is a balanced whole-house system. It extracts warm, moist air from kitchens and bathrooms while supplying fresh, filtered air to living rooms and bedrooms. A heat exchanger transfers much of the warmth from the outgoing air to the incoming air without mixing the two air streams. MVHR is generally best suited to airtight, well-insulated new homes or major renovation projects because it requires carefully designed ductwork, correct commissioning and regular filter maintenance.
Passive Stack Ventilation
Passive stack ventilation uses vertical ducts and natural differences in air pressure and temperature to move stale air from wet rooms to roof level. It has few moving parts and uses little or no power, but its performance can vary with weather conditions and the design of the property. It is less common in modern installations and needs careful assessment and design.
Choosing the Right System
A localised bathroom or kitchen problem may only require a correctly sized extractor fan and adequate replacement air. Several affected rooms may benefit from continuous extract ventilation, while widespread condensation in a suitable existing home may point towards PIV. MVHR is usually considered during a new build or major energy-efficiency renovation. Before choosing a system, the underlying cause of the damp should be checked: ventilation can control condensation, but it will not repair a leaking roof, failed plumbing, penetrating damp or rising damp. Any system should be properly designed, installed, commissioned and maintained in line with the requirements that apply to the property in Wales.
How WWEC Ltd Can Help
WWEC Ltd serves homes across Aberystwyth, Ceredigion and the surrounding Mid Wales area. We can advise on suitable extractor fan and ventilation solutions for kitchens, bathrooms and utility rooms, helping to remove humid air and reduce the condensation that can contribute to damp and mould.
Concerned about condensation or poor ventilation in your home? Contact WWEC Ltd to discuss an extractor fan or ventilation solution. Acting early can help protect your health and your property.