Abstract: A roof ventilation system can be installed between the rafters of an attic prior to the application of spray-in foam insulation. A roof ventilation system can be provided in 4-foot, 8-foot, or other lengths, of foam insulation board that have kerf cuts (i.e. partial cuts) separating the roof ventilation system into a main panel sized to fit between two rafters, and two side panels. The side panels can be folded over 180 degrees to meet the main panel, and an adhesive can secure them in place to form a foundation. The foundation of the roof ventilation system can include a roof adhesive that can secure the roof ventilation system to the underside of the roof between rafters.