Q. We’re framing a gable-roofed house with roof trusses. The roof includes a bumpout with a smaller gable roof that intersects the main roof, forming two valleys. A valley set will be installed on top of the main roof sheathing. The sheathing along the valley doesn’t have blocking for continuous nailing, and I’d rather not nail sheathing to sheathing. Should I install blocking between the framing members of the valley set to provide better nailing?