I am sure that Hardiplank is good - haven't used it myself but be wary of buying it from TheLogHome-Company.co.uk. The guy that runs that company and the company itself have outstanding CCJ's against them. Only buy from reputable source
Stuff is bit fragile, must be handled, supported, and stacked correctly. Do not stack in standing water, or allow water to stand on it. Installer should not allow it to get wet until installed and painted (if not pre-primed). Sounds like an employee training problem regarding handling, stacking, and protecting from water.
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