I have a Tyvek ground sheet (the heavier type) which I purchased ‘off the roll’ then washed 3-4 times to soften it up a bit. It’s been used for about 30 nights over the past 3-4 years.
I camped in rainy conditions this weekend and noticed that water soaked through where weight was on the fabric. This also occurred when I knelt on it. There don’t seem to be any actual holes - though there are some creases where the fabric is softer.
What’s your experience with Tyvek?