I live in a 100 year old building that was gut renovated about 4 years ago. It seems that the contractors were very stingy with the insulation, particularly around the window frames. We installed new, high quality windows last fall, and the air continues to leak in, which leads me to believe that a lack of insulation around the window frames and sills is the actual problem.
My question is, can insulation be safely blown behind the drywall? Is this something that a do it youself-er could handle, or would I need a pro for something like this? What type of insulation could I use?
Thanks in advance!