On Monday, January 28, 2013 2:12:09 PM UTC-5, nestork wrote:
.. -- nestork

Nestork,
Thanks for reply. Yes, I took a scraper to it and most scraped right off. It felt/looked/acted like a thin layer of rotten wood. This roof is on the north side of the house. My intention in this work is to air seal the attic and ventillate the deck as it's currently without any soffit vents. I understand your comment on leaving it for another 50years, but previous owner never lived in upstairs for all that time and it can get pretty hot/cold in summer/winter so I'm trying to be meticulous in my air sealing.
THANKS SO MUCH for your insight and opinion.
Regards,
Theodore.