we live in ohio if that helps at all
Absolutely 6 mil poly would be a good ideaSince you have the ceiling down, it may be the last opportunity to do this upgrade for the next few decadesIt shouldn't be critical for extending the life of the insulation as is usually the case, but it will reduce moisture migration from the living space into the wood components of the atticYou've probably already investigated this, but if you could install some side vents to allow air flow in the attic cavity this would be a big help too.
