Hi all, I am finishing my basement in a Split Entry style home. I noticed
that the overhang from top level over lower level is not well sealed. There
is only a vinyl soffit piece blocking air/heat flow. Should I block this
area with additional insulation or actually board it up? I assume it was
done this way for ventilation, as you would do with an attic, but this is
now a living space.

thanks to all replies!

Laura