Vapor barrier in attic?
I am helping family with their attic insulation, in East Lansing, MI. Newly purchased house, ~75 years old. The attic has 2 ridge vents and 2 additional netted vents in the roof, more centrally located. Soffit vents are covered by existing very old & dirty woolly to touch insulation. The same insulation is likely also present underneath the nice wood floor finished in the attic. There maybe 3-4” of it present, but not consistent, as we see through some gaps in the flooring. My family would ideally like to remove the floor, install insulation and put the floor back to allow storage and access to attic. But that job will not be quick and it is getting cold here already.
Reading in GBA, I see that the first item to address is the air sealing around penetrations. Those exposed without the floor we will air seal. This around the chimney may not be accessible before removing the floor. They only have ceiling mounted lights, no recessed cans. Is there anything we should do around those from the bottom/ceiling?
There is a door to the attic, not a hatch and staircase in the attic. That will be difficult to handle…
Needless to say, we are trying to improve at least partially over what they currently have.
We do think battens, as these could be moved later on, if they proceed with the job of removing the floor. We are considering Roxul or fiberglass rolls. Do we need to add any vapor barrier below the batts? Any other words of wisdom..?