Insulated Vinyl Siding

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Installing “insulated” vinyl siding on home built with exterior vertical planks that have 2” gaps between each plank and has no insulation. Will filling in gaps with lumber be sufficient or should plywood be installed first and will ¼” be sufficient? Would rather not use osb, but will it be ok with 2 layers of Tyvek?

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  1. Dominick Amorosso
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    A picture would be nice however I would just fill those gaps with wood. One layer of house wrap is fine.

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