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7. TRUSS DESIGN. Roof trusses are required to be designed by an Oregon registered Engi- neer or Architect. For trusses manufactured by an approved fabrication plant, have the design and layout drawings available at the construction site for the framing inspection. All job site cutting or modification of the roof trusses shall be clearly shown in the engineer's design calculations and drawings. TRUSS DESIGN (SITE BUILT). ROOf trusses are required to be designed by an Oregon registered Engineer or Architect. For trusses manufactured by an approved fabrication plant, have the design and layout drawings available at the construction site for the framing inspection. All ich site cutting or modification of the roof trusses shall be clearly shown in the engineer's design calculations and drawings, Iftrusaes aretobe built atthejob site, submit the engineer's design and construct[on plans to the Marion County Building Department prior to start of con- struction and have the approved drawings available at the site for the framing inspection. 8. ATTIC VENTS, Provide screened attic vents with a net free area of 1/150 of the attic area. (or 1/300 if between 50 and 80% of required area is ventilators in the upper portion of the attic and located at least 3 feet above eave or cornice vents. As an alternative, install a 4 mil vapor barrier on the warm side of the ceiling. [Sec. 806.2]. 9, BATHROOM LIGHT/VENT. Bathrooms, water closet compartments and other similar rooms shall be provided with a window of not less 'than 3 square feet, one-half of which must be openabie, or artificial light and an approved mechanical ventilation system capable of producing a change of air every 12 minutes. [Sec. 303.3] SAFETY GLAZING/TUBS. The following shall be considered specific hazardous locations for the purposes of glazing. 1. Glazing in doors and enclosures for hot tubs, whirlpools, saunas, steam rooms, bathtubs, showers Glazing in any part of a building waft enclosing these compartments where the bottom edge of the glazing is less than 60 indnes above the drain outlet) 10, OPENINGS BETVVEEN the garage ami residence shall be equipped with either solid wood doors not less than 1 3/8 inches in thickness or 20-minute fire rated doors. [Sec. 309,1] 11. THE GARAGE shaft be separated from the dwelling end its attic area by means of 1/2-inch gypsum board applied to the garage side of the wall. Where the separation is a floor*ceiling assembly, the structure supporting the separation shall be protected by 1/2-inch gypsum board or equivalent, The door between the garage and residence shall be equipped with solid wood doors not less than 1 3/8 inches in thickness or 20-minute fire rated, or equivalent. [Sec. 309.1, 309.2] 12. EVERY SLEEPING ROOM shall have at least one operable window approved for emergency egress or rescue. The window sill height shall not be more than 44 inches above the floor. The minimum net clear opening is 5,7 square feet, The minimum net clear opening height shall be 22 inches. The minimum net clear opening width shall be 20 inches, Exception: Grade floor windows may have a minimum net clear opening of 5 square feet. [Sec. 310.2, 310.2.1] 13, LANDING/EXTERIOR DOOR, A minimum 3 foot x 3 foot landing shall be required on each side of an egress door. The floor or landin9 shall not be more than one and one-half inches lower than the top of, the threshold. Exceptions: The landing at the exterior doorway shall not be more than 8 1/4 inches below the top of the threshold. [Sec. 312,1] 14. SMOKE DETECTORS shall be installed in each sleeping room, outside of each separate sleeping area in the immediate vicinity of the bedrooms and on each additional story of the dwelling including basements. All detectors shall be interconnected such that the actuation of