have you got condensation in your loft?
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Have you got condensation in your loft?

Loft condensation can be a common issue and, if not addressed, it can lead to problems such as mould growth, dampness, and damage to the structure.

Here are some steps you can take to prevent and address loft condensation:


Ensure proper ventilation in the loft space. Good airflow helps prevent moisture build up. Install roof vents, eaves vents, or ridge vents to promote ventilation.

Soffit Vents:

Soffit vents, located at the eaves, can facilitate air circulation by allowing fresh air to enter the loft space, check that they’re not blocked up. They work in conjunction with other roof vents to maintain a balanced airflow.


Proper insulation is crucial. Ensure that your loft is adequately insulated, and that insulation is installed uniformly without leaving gaps. Insulation helps regulate temperature and prevents warm, moist air from reaching cold surfaces and condensing.

Vapour Barriers:

Install vapour barriers to prevent warm, moist air from entering the loft space. These barriers can be placed between the insulation and the living space.

Seal Gaps:

Seal any gaps, cracks, or openings in the loft area that might allow warm air to escape into the cold space. This includes gaps around loft hatch, down lights, pipes, electrical wires, and vents.

Check for Leaks:

Regularly inspect the loft for any signs of leaks. Roof leaks can introduce moisture into the loft space, contributing to condensation. Address any leaks promptly. The most common causes of roof leaks are:

  • Chimney Breast area. This normally happens due to the weathering of the lead flashing thus allowing water to get down the back of it.
  • Ridge tiles, again due to weathering it causes the cement to crack and fall out of the joints. This then allows water ingress.
  • Cracked or missing tiles.

Use Dehumidifiers:

If you notice persistent condensation, especially during specific seasons, using a dehumidifier in the loft can help reduce excess moisture.

Check Insulation Thickness:

Ensure that the insulation thickness meets current building regulations of 270mm. Insufficient insulation may lead to temperature differentials and condensation. Contact our experts if you need help with loft insulation.

Monitor Humidity Levels:

Use a hygrometer to monitor humidity levels in the loft. Ideally, relative humidity should be kept between 30-50%. If levels consistently exceed this range, it may indicate a need for better ventilation or dehumidification.

Professional Assessment:

If condensation issues persist despite your efforts, consider seeking the assistance of a building professional or a surveyor. They can assess the situation, identify potential problems, and recommend appropriate solutions
Addressing loft condensation involves a combination of proper insulation, ventilation, and moisture control measures.

It's essential to maintain a balance to prevent the accumulation of excess moisture in the loft space.

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