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6. UNDERFLOOR VENTILATION. Provide at least 1 square foot of underfloor ventilation for each 1500 square feet of crawl space area. The openings shall be covered with a corrosion resistant wire mesh. At least one such opening shall be provided within 3 feet of each comer of the building. Vents may be omitted on one side. [Sec. 409.1] ?. CRAWL HOLE. Provide an access crawl hole to the underfloor space. The minimum size opening required is 18 inches by 24 inches. [Sec. 409.2] 8. THE STRUCTURAL SUPPORTS for decks, balconies, porches or similar structures shall be pressure-treated wood to protect against decay. [Sec. 322.1 .] THE VAULTED CEILING area is required to be insulated to a minimum of R-30. Twoapproved methods are: A. Provide R-30 insulation, a complete vapor barrier, and a minimum of one inch clear air space above the insulation for ventilation. Each pay shall be cress ventilated. B. Completely fill each bay with a minimum of (non-compressed) R-30 insulation, leaving no airspace. Provide a complete vapor barrier. The perimeter of the insulated area shall have an airtight barrier (i.e tight blocking). This method, while permissible, may void the warranty on the roof sheathing and roofing matedal because of excessive heat buildup. 1.0. 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]. 1][. ATTIC ACCESS. A readily accessible attic access shall be provided to any attic area having a clear height of over 30 inches. A framed opening not less than 22 inches by 30 inches is required. [Sec. 807.1 12. OPENINGS BETWEEN the garage and 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] 13. THE GARAGE shall be separated from the dwelling and its attic area by means of 1/2-inch gypsum beard 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] 14, ENCLOSED ACCESSIBLE SPACE under stairs shall have walls and soffits protected on the enclosed side with 1/2 inch gypsum board. [Sec. 310.3] 15o STAIRWAYS shall not be less than 36 inches in clear width at all points between the handrail height and the required minimum headroom of 6 feet 8 inches. Minimum width from the handrail down is 32 inches with one handrail, 28 inches with two. The minimum required stair tread width is 9 inches. The maximum stair [ise is 8 inches. When Hsers are closed, all treads less than 10 inches shall have a uniform nosing between 3/4 inches and 1 1/4 inches. The greatest dser height/tread depth shall not exceed the smallest by more than 3/8 inch. [Sec. 314.1,314.2, 314.2.1,314.3]