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House wrap or Fanfold?????

I am preparing to remove my old vinyl siding and replace it with new vinyl. My question is about whether I should use fanfold insulation or a house wrap (like Tyvek) or both. And if I use both, which one should be installed first? I have already purchased both but could return one if not needed. Thanks in advance for any help.

Re: House wrap or Fanfold?????

I would use both. House wrap against the sheathing. What happened to the original house wrap or felt?

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