Won’t argue the point, but I’ve seen LOTS of discussion of foil insulation here and on other websites - bottom line conclusion was that except for certain very limited special circumstances, the only thing it insulates well is the seller’s wallet - by increasing the number of FRN’s contained therein… Only place I can think of where I’d even consider using it is if I were to put in a solar or wood burning hydronic setup, and wanted a single layer around a storage tank, as part of a much thicker sandwich of insulation.

Gooserider

Gooserider-
“basement is COLD… However there is also nothing insulating the floor or rim-joist”
If I were you I would make it a priority to insulate those rim joists this year- you will be pleasently
suprised what a difference that will make. Without insulation there- you only have the rim boards and
siding between you and that frigid air outside, and that cold air just goes to your floors… brrrr.

Wildsourdough: Rim joist insulation suggestion is excellent. If basement wall is concrete block make sure to seal any cavity at the rim plate and where the rim plates
meet. Redoing mine at the hight of the cold winter found insulation at the outer area frozen at joint of sill plates. Moisture was coming through the joint and freezing. Sealed and later taped and that corrected the problem.

Pretender