[Greenbuilding] CF analysis of tearing down a house vs. renovation?

[Matt Dirksen]

I understand its "assumed" that tearing down an old house and building a new high efficient home is still going to have a higher CF than adding/renovation/energy retrofitting an existing home.

However, can anyone point me to any carbon footprint analysis of something like this? (And yes, I fully understand its  an apples to oranges comparison.)

Thanks much,

Matt