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Thanks everyone for your input. It raises a couple more questions though. I know that Tyvek or other housewrap is a moisture barrier and not a vapour barrier. My questions: even though the insulation batts have the kraft paper backing, that doesn't create a continuous vapour barrier, because...

Hi everyone, we are replacing the wood siding on an older home with vinyl. In the process I want to add insulation from the outside, since the home likely has very poor insulation. I plan to tear off the wood siding, add fiberglass batt insulation, nail 4x8 OSB to the studs, housewrap and then...