I have an issue in that the two tread planks are placed touching each other. The material is obviously not particularly rot resistant, and he DOES suggest using a end cut type product, why not give a space for the boards? They are going to trap detritus and promote rot. Here in Northern CA, I found that if I used 3/8" spacing, I have almost no buildup, much easier to clean stairs when they get leaves or needles too.
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