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I would say... never. What is a tarp but something that keeps precipitation off of you. In humid summer months, sure, condensation can cause precipitation under the tarp, but in winter, this is not so much a concern, and you can pitch it lower to the ground. You might get frost inside - but just shake it off when you pack up. Tents provide a few degrees ...

Builders typically get Tyvek in 9' rolls instead of 4' and 5' sheets. You may be able to buy a small piece off of the roll from your local building supply store or find some waste at a local construction site so that you don't have any seams to join. If you do need to join two sheets of Tyvek, Tyvek Tape is specifically designed for sealing the joints when ...

Let's look at the physics behind where all the condensation came from. At night the air gets colder, but the ground has a lot of "thermal mass", so stays much closer to the average day/night temperature. This means at night the moisture from the ground will be entering the air at the ground, but that air will cool as it rises. That increases the water ...

I don't get condensation under my tarp, not in general, even after several hours in a heavy downpour. I don't pitch it over vegetation, in general. I did have condensation one time when I had it pitched close to the ground, just enough for me to lay under, and it rained heavy all night, perhaps 1-1/2 inches or more. If the rain's coming straight down, I ...