Managing condensation in a roof tent

Neill Shurville
Last update by Neill
May 23, 2023


Learn why condensation happens in a roof tent, and how to avoid it.

  • Condensation explained
  • How to avoid condensation
  • Avoiding mould caused by condensation

There is nothing worse than waking up in a damp tent. Although condensation is hard to completely avoid, there are a few ways to reduce condensation build up when sleeping in a roof tent.

Condensation explained

One person can exhale up to 1 litre of water over night, and this water vapour converts to liquid when it meets the colder walls of the TentBox. If there are multiple people sleeping in the TentBox, the amount of water in the air increases and condensation can be mistaken for a leak.

All our TentBox models are built with top-quality waterproof fabric, and have a waterproof silicone sealant tape applied behind all the seams for added protection.

How to avoid condensation


Ensuring your TentBox is thoroughly ventilated is the most effective way to avoid condensation building up.

We know that leaving your TentBox windows open when it's cold outside doesn't seem very inviting, but it will allow the air you exhale to escape before it turns to liquid water. If you're camping in the winter months, it's important to use a suitable sleeping bag that is rated for low temperatures, as well as appropriate clothing - this should keep you toasty warm and your TentBox dry.

Wet clothes and gear

Having wet clothes or towels inside your TentBox will increase the moisture levels in the air and will make condensation far worse. Make sure you bag up any damp clothes and leave them outside your TentBox, either in your car or under an awning.

Avoiding mould caused by condensation

Dampness from condensation can eventually lead to mould if not dried out properly.

If your TentBox has built up with condensation overnight, try and leave it to air out as best as possible before you get going again.

If you're closing your TentBox down for a period longer than 24 hours, it's VERY important to make sure the unit is thoroughly dry beforehand. The best way to do this is to pop your TentBox open on your driveway (if it's sunny out!), your garage or an enclosed car park to air out until fully dry. 

This will prevent mould growth, and will keep your TentBox looking and smelling clean for your next adventure. 

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