Maybe you should just go to their website and read their installation instructions. They have a lot of good information and you won't void the warranty. Never used screws and I don't know if that would work or is even recommended. Also, Hardie siding no longer recommends caulking the joints, just butting them up and putting flashing underneath each joint. It's best to always refer to the manufacturer for advice about how their products are to be installed.
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