If you like making your own things and you plan on doing it anyways why not just buy the material to make a real tarp? it won't be that much more than the Tyvek. I've been building houses for over 20 years and have use Tyvek quite a bit. it's a vapor barrier, not necessarily waterproof and it breaks down over time when crankled that's why it gets softer. The softer it gets the more fluffed the fibers are and the quicker water will soak through when puddled. Add to that the fact that it's extremely bulky and really noisy even when it's been softened, it can also tear fairly easy when the rip happens in the right direction. Anyways it can work,many people have used it but it certainly not ideal. I would suggest you would be better off buying some 6 mil plastic and reinforcing the stress points with duct tape. This method would be a lot cheaper, lighter and more compact.
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