Readers ask: How Do I Stop Condensation In My Loft?

Two processes must be in place to effectively stop condensation in the loft space. Firstly there must be adequate ventilation. Secondly, you must remove or reduce as much as possible warm moisture laden air rising into the loft. To prevent warm air rising into the loft, ideally, a vapour barrier would be fitted.

How do I get rid of condensation in my loft?

Avoid blocking air vents, open up window trickle vents, don’t cook/bath/shower without thinking about ventilation. Don’t dry clothes on radiators during cold weather spells, if possible use a tumble dryer and if not, keep a window at least partially open to vent the moisture.

How do I stop condensation in my attic?

Preventing attic condensation

  1. Make sure kitchen and bathroom exhaust fans aren’t routed into the attic. They’ll only bring more humidity to the space.
  2. Regulate the attic’s temperature. Use ventilation to keep the temperature consistent and avoid heat buildup that melts snow on the roof.
  3. Insulate and air seal.

Why is there so much condensation in my attic?

Condensation will form in your attic if warm moisture laden air comes into contact with a cold surface. In the real world this means moist air from your house coming into contact with the underside of your cold roof tiles or the side of your water tank etc.

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Will a dehumidifier stop loft condensation?

If you find that your loft space is too humid, you can use a dehumidifier to reduce the humidity. A dehumidifier will not work in an undeveloped loft space because it will be taking the fresh air that comes from under the eaves, which is very inefficient.

Why is my loft full of condensation?

Condensation in lofts occurs when humid air makes its way through insulation or other gaps into the loft space and hits a cooler surface leading to beads of moisture on timbers, lintels and on the underside of the roof.

How do I fix condensation in my roof?

One very simple method to cut down on condensation issues in an attic is to use a dehumidifier. The major contributor to condensation in your home is improper ventilation. Leaky bathroom and kitchen vents allow warm air to escape into an attic and then condenses on cold roof sheeting.

Should I put a dehumidifier in my attic?

Placing a dehumidifier inside the attic will help to draw out moisture from the surrounding environment. Once the dehumidifier’s storage tank is full, it won’t be able to remove any more moisture. Dehumidifiers are really just a temporary solution to attic moisture problems.

Is moisture in attic normal?

While many homeowners usually associate dampness with basements or crawl spaces, attics can suffer from moisture problems just as easily, which can lead to damaged insulation, structural issues, and problems with mold.

What is the best way to ventilate an attic?


  1. Assess Your Needs. Before you make any changes, it’s important to determine if your attic actually needs additional ventilation, and if so, how much.
  2. Insert Roof Vents.
  3. Add Soffit Vents.
  4. Install Gable Vents.
  5. Use Fans to Improve Airflow.
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How can I improve my loft ventilation?

The most popular roof ventilation solution is to have soffit vents providing cool, fresh air into the loft from a low level, and a tile vent or ridge vent at a high level for the warm stale air to exit the building.

Can a boiler in the loft cause condensation?

It sounds like the extra heat generated by the new windows & boiler are causing condensation as you thought. You probably need to increase the insulation in the roof space to 250mm and fit tile or slate vents above the insulation to allow any moisture to escape.

Can too much insulation cause condensation?

Too much insulation and a lack of ventilation and your home may experience issues such as stuffy, stale and unpleasant air along with related problems such as condensation, mould and damp. The balance is a delicate one and will vary from home to home.

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