Hmmm, interesting, doubling up the layers, I was wondering about that. Your link gives a variety of options, which one in particular are you using?
Most of the weed barrier cloths are sold in 3 or 4 foot width pieces, which would require overlapping. If that's what you did, how much did you overlap each of your sheets?
In the spruce link, there is one that is used for soil erosion and is a 12.5ftx60ft, which could easily be laid down without worrying about the gaps. But according to the article, it's not very permeable so hmmm.
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