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As you stated in your question, there are many different Tyvek fabrics, some are only water resistant, whereas others are completely waterproof (such as is used for express mail envelopes and printing materials). There are lots of forums online that discuss the use of Tyvek tarps for backpacking, to determine how water resistant your fabric is you need to ...


I have tested the 1443R multiple times from multiple roles and it has consistently resulted in water seepage through the fabric after having 200 pounds of weight on top of it (shelter + person). These testings were performed on wet ground, muddy ground, and wet grass. If you are wanting to have tyvek that will work in all weather conditions, best to go with ...

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