by hardiplank i'm assuming you guys mean cementboard lap siding. To make the stuff last for ever you should take the time to get a good primer on the back of it before installation. It comes primed on front but not back. This is something a lot of people don't do. But if i was a contractor i would suggest to a homeowner to pull the lap siding out get a good coat of primer on the back before we install it. It will than last for 50 years.
Ps. I realize nobody wants to take the time to do that. :cheesygri
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