Normally that question can only be answered by an inspection by someone
with good roofing knowledge and consideration of local conditions.

When re-roofing always get more than one estimate.

--
Joseph Meehan

26 + 6 = 1 It's Irish Math
"TomCAt" wrote in message
...
When you take off an old roof. ... The old sheathing is boards. The
boards are old but they are tight next to each other. There is one roof
on above.

Is there any reason to re-cover the old sheathing?