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I have always used a handful of nails around the perimeter, then use screws for most, but I countersink every single hole first.


Depending on what is behind your backer you need long roofing nails. I use HB 30-40 times a year and and I use the HB screws and long roofing nails. For shower walls that are a little tough I will double predrill for my backer screws. I will use a small bit for the hole then I will through each hole and use a larger bit. The larger bit I just give a tap ...


I'd be inclined to add a few roofing nails in critical locations--corners, edges, etc. The nails mostly provide sheer strength, so it's unlikely that you'll see a problem.

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