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Have to ask... What is NC?
I was told by someone that Hardie Board overlaps and corner trim didn't have to be caulked, but, I really don't know?

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You should go to the James Hardie website and there you will find what to caulk and what not to caulk based upon the type of siding with which you are dealing. Especially interesting is how to caulk above windows. Keep in mind that what not to caulk (butt joints, for example) is based upon the installation of flashing behind those joints. Also keep in mind that Hardie has changed their caulking requirements over the years, as they have tried to minimize maintenance issues regarding re-caulking.
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