I just had my roof done. It had 2 layers of asphalt and the original cedar roof.
The ribs on the rafters were 1"x2", spaced around 6 inches apart. I believe it was originally roofed in 1928 or so.
I found that the roofers DID NOT remove the ribs, and left many in place, broken, or semi-removes. They put down 1/2" ply on top of the ribs.
When I was younger I ripped many roofs, many cedar roofs were under asphalt, and we ALWAY took it to the rafters before any ply was put down.
I have never seen anyone leave the old & broken ribs in place, is this normal?
Also, wouldn’t the 1" stand off of the py to the rafter be a concern? ( I am also wondering what they used to attach the ply to the ribs / rafters, hopefully not roofing nails!)