Cut the strips to fit between floor joists using a box cutter. How to Finish a Basement: Framing and Insulating Run a bead of acrylic caulk around each section of foam to form an airtight barrier.

Insulation in floor joists helps with thermal performance and sound. We are building a garage apartment and used ROCKWOOL to insulate the floor platform. This is video #2 in our 4 part series on ...