Insulating between ceiling and second level floor.
I have an old 2 story 115 year old home that is somewhat insulated. I have blown in insulation in the walls 3X5 stud, and approximately 7-9 inches of blown in the attic. But there is one location that has none, and that location is in between the first floor ceiling and second level floor. When there is a cold snap - 12C and below, or if there is any type of cold with a wind, it makes the upstairs floor very cold, plus you can feel a chill coming from the ceiling if you are on the main floor. I know that there is no insulation, because I removed a wall last year and noticed when the ceiling was open that there was no insulation in that area (up against the outside wall). Just wondering if anyone has any tips on how to alleviate this? Any suggestions would be appreciated.