I am adding insulation to a salt box cape. I am located in Rhode Island. I have 2 seperate attic areas. The first area is above the bedroom which is easy to insulate. The second area is an area through one of the bedroom and runs full length front side of the house. This crawl space is insulated with R19. The insulation is along the rafters. During winter this space is cold and leaks into the bedroom. The knee wall door is insulated to R30. I would like to improve insulation in this area. My question is should I insulate the knee walls in this space and or floor with unfaced insulation? If I do insulate this area will I run into ventilation problems? Any help would be appreciated. Thanks.