A place in the 847 located by Mission Creek a.k.a. DEUCE-ONE. The "devil's roof" is basically an alley with a bridge on top that encloses the alley. It is called "devil's roof" because of the graffiti and the crimes that occur in the alley, hence the name "devil's roof"
"If you want to see the devil's roof, you're going to have to go to deuce-one to check it out. (at day)"