Condensation in Garage:
How to Reduce Garage Roof Condensation


Is condensation stopping you from using your garage how you’d like to use it?

Whether that is dripping condensation or pools forming on the underside, it can seem like there are no clear answers on how to resolve garage roof condensation.

In this guide, our experts in garage refurbishment have come together to give you real life tips on how to reduce condensation and get yourself back in your garage as normal.

Today you’ll learn:

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What is Condensation?

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Dripping Condensation from Garage Roof

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Causes of Garage Roof Condensation

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How to Reduce Condensation in Your Garage

What is Condensation in the Garage?

Condensation in your garage is no different than condensation that occurs on the inside of your windows on a brisk winter morning. When warm air inside of the garage encounters a cold surface such as the garage roof, condensation starts. You will know condensation when you see it – showing as wet blotches or spots on the underside of the roof.

In worst cases, there can be large patches of water which drips onto the floor or your belongings.

Dripping Condensation from Corrugated Garage Roofs

Dripping condensation from the garage roof happens when your roof material is not absorbing moisture properly. Porous roofing panels such as asbestos or cement fibre should be replaced with water-resistant materials like rubber or galvanised steel.


Causes of Garage Roof Condensation

Condensation in the garage is most often caused by:

  • A change in outside temperature
  • Running appliances without ventilation
  • Roofing panel material
  • Parking a car in garage whilst the engine is still hot
  • Poor drainage system
A Change in Outside Temperature

The underlying cause of condensation is a difference in temperature between the inside and outside of the garage.

Unfortunately, we cannot control the weather or outside temperature.

Often in the winter, or after it has rained, the warm, moist air inside the garage rises to a now cold garage roof. Any sources of heat inside of the garage will also raise the temperature of the air – amplifying any condensation problems.

Running Appliances in the Garage Without Ventilation

Many of us use our garage as somewhere to keep our household appliances.

The problem is, things like the washing machine or fridge freezer emit heat inside what is an enclosed space.

With no ventilation, the heat trapped inside rises to the roof of the garage and interacts with the cold air on the outside, resulting in condensation.

As the heat is unnatural, excess condensation is more likely to form and begin to drip.

Roofing Panel Material

Most garages are not well insulated nor well ventilated.

Garages built many decades ago were designed to prevent water coming in from the outside. But, they do little to nothing to stop trapped moisture in the air causing your garage roof to condensate.

Only roofing systems with an anti-condensation membrane will negate damage caused by condensation.

Ageing roof panels are also prone to being eroded away by rain, sleet, and snow. Cracks eventually will show and swell in the winter months. Water may seep through these cracks and cause leaks in the garage roof.

Prevent Condensation on Your Garage Roof from Dripping

At Danmarque, we install an anti-condensation membrane on the underside of all our garage roof replacements.

Protect your garage from water ingress, condensation and leaks for life. Watertight garage roofing systems made possible with DR!PSTOP anti-condensation membrane.

Get a quote online today.

Condensation in Garage Roof Panels
Parking a Car in Your Garage Whilst the Engine is Still Hot

When you bring your car home after a drive, the engine will be emitting a lot of heat. If the car goes straight into your garage, with the garage door closed and no source of airflow, the temperature inside will rise rapidly, resulting in condensation.

Parked Car Causing Condensation in Garage

All motoring associations, including the RAC and the AA recommend you leave your car outside of the garage whilst the engine is still hot. You must for the engine to cool down before parking your car in the garage for the night. Condensation can not only damage your garage but also the rubber seals around your windows, doors & electrics which may lead to expensive repairs.

Poor Drainage System for Water to Run

Condensation may also be a result of a poor drainage system. For example, a failing drainage system will inevitably begin to pool on the garage roof, around the garage and, possibly, inside. When water pools like this, it either evaporates or condensates.

Mulch and dirt will build up too and add more fuel to your condensation problems. A proper drainage system will ensure dirt & water is drained away from the garage.

How to Reduce Condensation in Your Garage

Here is a list of ways to reduce condensation in your garage:

  • Introduce more airflow
  • Remove sources of hot air from inside the garage
  • Install anti-condensation roof panels
  • Insulate the garage roof, walls or floor
  • Inspect your drainage
Introduce More Airflow

Improving airflow to your garage is the most accessible way of reducing condensation issues. Good ventilation is key and, if the garage has no room to breathe, excess moisture in your garage will build up and condensate. There are ways to introduce more airflow, for example you could:

  • Open your garage door
  • Open/install a garage window
  • Open/install a side access door
  • Remove foam infills from your garage roof
Remove Sources of Hot Air from Inside the Garage

When proper ventilation is in place, appliances that emit heat are perfectly fine to store inside the garage. However, even with good airflow, it still may not be possible to prevent condensation. If the appliance, car or machinery emits too much heat, you may have to remove these from your garage altogether.

Install Anti-Condensation Roof Panels

Preventing water ingress is critical for most homeowners. If condensation is persistent and compromising the security of the garage, your best option is to replace the garage roof with anti-condensation roofing panels.

Insulate the Garage Roof, Walls or Floor

Besides insulating the garage roof, you can also insulate the garage walls or floor. It may be worth your while to speak to a professional about insulating the inside of your garage.

Inspect Your Drainage System

Check your gutter systems and floor drainage to ensure they are working correctly and draining water as they should be. Keep an eye out for anything obstructing the gutter downpipes or the drain covers.


There is no one way to solve condensation and unfortunately, in some cases condensation simply cannot be stopped. However, condensation be controlled and managed so that it does not impact the way you use your garage or damage anything left inside.

If you follow the advice – allowing more airflow for your garage to breathe, managing hot air sources and resolving any drainage issues, this should reduce condensation problems. If the problem persists, you may have to install anti-condensation roofing systems to kick your water problem once and for all.

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