insulating an unfinished upstairs to a Cape

It was suggested by the Zipcode site that I need an R-49 insulation in my unheated attic area and R-13 in the wall of our unfinished upstairs of our Cape. We are currently finishing this area. We were told we could not put anything greater than an R-15 in the area between what will be our bedroom ceiling and the attic floor due to the plywood floor we put on top of our rafters above our upstairs bedrooms to create an attic floor. We were also told that we could not insulate the roof peak because it would not be a heated space. My question would be, is it true that we cannot insulate our roof peak, even if properly vented, and why? And are there any products designed to provide a higher r-value than batting insulation that would be thinner than regular batting insulation (that can be fit in between the ceiling of our to-be bedrooms and floor of the attic)? Do we use faced or unfaced batts in either walls or ceiling?
Thank you for your time,
Cathy

 

If I have this right No you dont try and insulate the roof peak. The attic above you has to be vented to the out side all the time there is no heat there.You just insulate the ceiling of your bed room. Faced batts wall and ceiling paper side to the roomED