I can't remeber seing hollow core, I would think you would have to have some kind of foam in there to make the panels a little more rigid. I agree thinking this will give you a r-value thats worth anything is the wrong.Anybody looking to reside there home should look into solid core siding some have an R value of 5.It also will hold up to high winds we have been installing it for over 8 years holds up better then hollow siding.
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