WAC 246-359-330. Roof framing ventilation for wood framed construction and concrete masonry units (CMU)

(1) Ventilation must be provided for enclosed roof framing spaces by providing sixteen-mesh screened openings at: (a) The eaves; (b) The gable ends; (c) The ridge; or (d) Any combination of (a) through (c) of this subsection. (2) The minimum amount of ventilation openings must be at the rate of one square foot of net free opening for every three-hundred square feet of attic area.