Attic Insulation/Vapor Barrier/Venting
I'm installing insulation in well what i call the attic but it's a side room next to the heated living space with minimal room because of the slope of the roof. First thing, this house has no soffit so i'm not sure how the roof has air flow like it should. It just has two gable end vents which arn't above this room and nothing at the ridge. I've been installing faced batt insulation in the floor of this space but i won't be able to staple it since it needs to face down towards the heated space, which is a kitchen and living room that's allready finished with sheetrock. If i just place the insulation between the joists, paper facing down, without stapling, doesn't this defeat the purpose of a vapor barrier since it will have gaps and not be sealed? Same thing with the walls of this space, i have access to the backside of the wall (inside this room), since its finished sheetrock i'll be able to place the insulation between the studs on the backside of the finished sheetrock, paper facing heated space, but won't be able to staple it. Years ago there was insulation in the rafters so someone must have heated this space, but i don't need it heated but need to insulate from the other heated spaces of the house. I live in NY if that matters. Any help with this would be great.