I failed an inspection because the inspector said we did not seal all penetrations we drilled through 2 x 4 studs. We are in the habit of filling the holes penetrating the top plate with foam and have never had any problems. Now on our last rough in inspection it was failed because we did not foam the holes going horizontaly through the walls. Does any one need to do this also our does any one know th code that says I have to do this.