I have an unfinished attic in my NY house. The attic is bordered on one (in)side by a bedroom and on part of another (in)side by a bathroom and hallway. The other part of the attic (crawl space at best) is over the back patio. The attic space has a small double-hung window at one end (I always keep it open for ventilation) and a few small round air vents in the patio ceiling.
The previous owner (can't imagine the original builder doing this) has placed foil-faced insulation, with the foil facing inside, between all rafters in th eattic on the underside of the roof. [If I take the insulation away there is the wood tongue-in-groove roof material and on top of that just a layer of asphalt roofing shingle]
Does the insulation do anything for me? Is it the correct insulation to have - foil faced with the foil showing inside? There is no insulation on the inside walls up against the bedroom/bathroom/hallway as mentioned above. Do I need and should I put insulation in between the wall studs here?
Thanks for your help. Walter