I saw somewhere that the rough side should face out in case of thinset and smooth in case of mastic. I hung some boards randomly before knowing so some smooth sides are facing out and I'll be using thinset.

Does it matter to the extent that I really need to redo?

1 Answer 1


According to the James Hardie Website FAQ, either side is fine to use. However, they recommend smooth side to be up and nailed every 8" on center.

  • I agree. They put a little more effort into finishing one side more smoothly just to make troweling easier, but it won't affect the outcome of the project.
    – isherwood
    Feb 14, 2019 at 18:22
  • Okay, so I don't need to redo, correct?
    – amphibient
    Feb 14, 2019 at 18:34
  • 1
    Not unless you are just really OCD and it will keep you up nights. Feb 14, 2019 at 18:35
  • I am slightly OCD, LOL
    – amphibient
    Feb 14, 2019 at 18:49

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