Walls often have air spaces hidden somewhere between the siding on the outside and the drywall on the inside. Some are accidental -- some on purpose, even code required -- some served a purpose at one time in history but because of the evolution of construction, are no longer useful -- some a...
First ensure that this is not a leak in the basement wall. Click here for details on Waterproofing a basement wall.
Second ensure that the wall is well sealed, especially around electrical outlets and floor and wall joints. Click here for details on Air Sealing.
Finally, make sure there is no a...
You might also call this entry “Insulating the ceiling of a garage under a bedroom”.
Any floor over a cold space will be cooler than a floor over a heated space, no matter how well you insulate it. So bay window jut-outs always have cold floors as do rooms over garages. For the bedroom over a...