In rolling ventilation, how does the saw orientation change relative to the rafters/joists?

• A. The saw orientation remains perpendicular throughout the cut
• B. It shifts from perpendicular to 45 degrees and back to perpendicular
• C. The saw orientation changes to parallel and then back to perpendicular
• D. It is rotated to a full 90-degree sweep around the member

Answer: (B)

Rolling ventilation relies on progressively cutting through the roof deck while staying safe around the structural members. The saw should be oriented perpendicular to the rafters or joists when entering a bay so you cut cleanly through the deck between the members. As you roll across a rafter or move to the next cut, you tilt the saw to about 45 degrees to avoid binding on the rafter and to keep the cut advancing smoothly. After passing that obstruction, you rotate the saw back to perpendicular to finish the cut and create an effective vent opening. This shifting, from perpendicular to 45 degrees and back to perpendicular, helps you control the cut, protect the rafters, and maximize ventilation efficiency.