Cut rigid foam insulation into strips with a table saw or a circular saw. Cut the strips to fit between floor joists using a box cutter. How to Finish a Basement: Framing and Insulating Run a bead ...

It's not necessary, but basement ceiling insulation in the floor joists can help deaden sound and help you have a warmer ...

This approach is much better than the usual thing I see where people try to install batt insulation between the floor joists from underneath. Besides being a big pain, and only marginally ...