“A tent is a temporary shelter that is easily disassembled and transported. To improve internal climate and reduce condensation some tents feature a canopy covered by rainfly design.” This a brief Wikipedia definition of a tent. A tent is not a house with a combination of insulating and venting layers that regulate humidity on the inside.
Condensation in a tent can result for various reasons.
Humidity in the ambient air, humidity created by the bodies of the tent occupants and humidity in the ground below the tent all have influence on condensation buildup in a tent. Vapor in the air and the fact that the temperature in a tent is higher than the temperature outside lead to humidity condensating under the rainfly.
Vibrations of the tent in wind or during heavy rain can cause the accumulated humidity droplets to drip onto the tent canopy creating a fine spray. This can lead to the false conclusion that the rainfly is leaky.
How can condesation be reduced in our tents?
The key is ventilation. The more you ventilate the less condensation can be generated. All our tents have various venting possibilities to reduce the inevitable condensation buildup.
A tent footprint that covers the ground of the vestibule area also helps reduce condensation in a tent.
And here a tip for tent setup:
Tension the rainfly as best you can using the supplied guylines as it helps raindrops bounce off the fly and reduces vibration and fabric flapping. The fly then works like an umbrella, which is usually made of non waterproof fabrics and gets it’s waterproof properties only through tension. Waterproofness is improved through tension. The water column of the rainfly fabric is only one aspect of waterproofness, tension the other.
As all fabrics absorb some humidity which then leads to stretch, the fly may need to be retensioned during rain (remember to reduce a bit of tension when the rain stops).