In a message dated 7/21/2008 9:49:07 P.M. Eastern Daylight Time,  
[log in to unmask] writes:

Is this  "junk framing", or appropriate respect for the integrity of
the older  building?  Wouldn't it be more correct to at least strip off
the  shingles and tie the new roof to the old roof?  Doesn't this
approach  risk runoff water getting under the new roof  structure?


Couldn't get to the pic, but rather than "appropriate respect," it  sounds 
more likely that the owner was too cheap to have the old shingles ripped  off, 
the contractor was too lazy, or both.  There's a good chance the  contractor 
told the owner he'd save him 50 cents by leaving the old roof in  place rather 
than paying laborers to remove it, and paying tipping fees to get  rid of it at 
a legit (or illegit) dump, and the owner went for it.
 
As for runoff, as long as the new roof is flashed properly (and that may be  
a big if), there shouldn't be a problem leaving the old ashfault shingle in  
place.  It's relatively uniform and compact dimension-wise, unlike old wood  
shingle, so it should be OK,  But I'd agree it'd be better to rip it out.  They 
may be planning to lay down an entire new roof on new deck at the addition,  
and over the old ashfault on the old part of the building.
 
Ralph



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