In article ,
"twiedeman" wrote:

This means the old roof must come off before new roof can be installed .Term
often in reference to flat roof(hot-mop tar) or composition
shingles-typically 3 layers of composition may be applied before a tear-off
and re-roof.
Todd

Thanks, that's very clear. I take it that a new tear-off roof would be a
pretty good selling point on an existing home, since the roof could be
rebuilt instead of replaced, is that right?