I bought my DC area row house 4 years ago. During my initial inspection I was told I needed a new roof, so I had a new one installed prior to my moving in. I did not realize how HOT the upstairs bedrooms got (had it done before I moved in, and did not have them add any extra insulation)! The roof is in good shape and I recently painted it with BlackJack Cool Roof. I am now in the process of gutting my bathroom. During the bath reno, the bath ceiling has been removed and I can see how little insulation there is up there (and what is there is 80+ years old). The roof does have venting on the roof (2) and front and back of the house (2 in front and 2 in rear). So I guess this is called a ‘Cold Roof’. View Photos here: http://dcarearowhouseflatroof.shutterfly.com/pictures/8
My question is, now that I have the bathroom ceiling down, should I blow in some extra insulation for the whole upstairs? I would not be able to remove what is already there so it would have to go on top (could not reach). And I know I still have to leave plenty of room for ventilation. What would you do?