Owens Corning R-30 Unfaced Batts are primarily utilized in roofing, ceiling, and interior/exterior wall applications. It is suitable for both wood and metal framing cavities or installation between furring channels.
The optimal choice for basement ceiling insulation is closed-cell spray foam. Key to basement insulation is controlling moisture, and closed-cell spray foam excels by providing a robust water vapor barrier.
You should start by preparing your attic space. First, check and clear the area where the baffles will be installed, removing any old insulation from the edges if necessary. For more information, check out our guide https://www.greenattic.com/blogs/how-to-install-attic-baffles