1988-04-25 Resolution 2416 - Laserfiche WebLink

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78. Composition shingles shall have an underlay of not less than 15# felt, applied as a base sheet. Sec. 3203-d-5-a. 79. Composition shingles shall be laid on slopes that are 4/12 or greater. If less, installation approval must be granted by the Building Official. Sec. 3203-g-2. 80. Roof valley flashing shall be provided of not less than #28 galy. sheet gauge corrosion resistant metal and shall extend at least 8 inches from the center line each way, and shall have a splash diverter rib not less than 3/4" high at the flow line. Sec. 3203-d-5-b. 81. Enclosed attics and enclosed rafter spaces formed where ceilings are applied direct to the underside of roof rafters shall have cross ventilation for each separate space by ventilating openings protected against the entrance of rain and snow. The area shall be not less n 1/1.50 of the area of the space ventilated. Except that the area may be 1/300 provided at least 50% of the required ventilation area is provided by ventilators located in the %ipper portion of the space to be ventilated at least 3 feet above eave or cornice vents with the balance of the required ventilation provided by eave or cornice vents MECHANICAL SECTION 82. At least three feet clear space shall be provided in front of all zone valves and controls, etc. for access and servicing. Sec. 7209 SBC 83. Chimneys shall extend at least 3 feet above the highest point where they pass through the roof of a building and at least 2 feet higher than any portion of any building within 10 feet. Sec. 7403 SBC 84. All chimneys shall have cleanouts and the cleanouts shall be constructed so that they will remain tightly closed when not in use. Sec. 7403 SBC 85. Masonry chimneys serving gas fired boilers, furnaces or other heating devices, whether of the gas designed type or fired by gas conversion burners, having an input not exceeding 400,000 BTU per hour, shall be lined continuously from the thimble to the top of the chimney with an approved non-combustible, acid and corrosion resisting liner of the same equivalent cross sectional area as the vent connector. Sec. 7403 SBC 86. A condensation pocket shall be provided at the base of said liner with provision for a drip, so arranged that excessive condensation of combustion products may be disposed of. Sec. 7403 SBC 87. Chimney caps may be used on chimney liners providing they do not obstruct or impair the free emission of the products of combustion, are approved by the administrative authority. Sec. 7403 SBC 88. Single wall metal pipe shall be constructed of sheet steel not less than #20 gauge or other approved non-combustible corrosion resistant material. Shall be installed only for runs direct.Ly from the space in which the appliance is located through the roof or exterior wall to the outer