Did an inspection, for a General Contractor, no less. He did a 2nd floor addition to his house. Put in OSB I joists to support the 2nd floor. He called me to do an energy audit of his house ($375.00). The main problem was air infiltration at the 1st and 2nd floor top plates, but there was an interesting finding.
The OSB I joist ran from the front to the back of the house. See these pictures:
Rear view of the house. Note the slight increased temp just above the where the 2nd floor addition is (vinyl siding).
Interior pictir of the same area. Note the cold areas at the ceiling / wall interface.
Picture of the ceiling at the center of the room. Note that the area between the joists is colder. Cold air infiltrating (actually, hot air exfiltrating) around the can light.
The rim joists were not insulated and sealed, allowing cold air to come into the inter joist spaces and make the 1st floor ceiling cold.
Feel free to swipe these images for educational purposes.
Hope this helps;