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ATTIC VENTILATION <br />CALCULATIONS <br />- Al <br />UPPER VENTILATION <br />ATTIC VENTILATION <br />REQUIRED <br />PROVIDED <br />1/150 RuleLW <br />ATTIC <br />1/300 Rule <br />Ridge <br />Off -Ridge <br />(No Upper Ventilators <br />(Must Provide Upper Ventilators) <br />Vent Amt <br />Amt. <br />Req.) <br />(Ft.) <br />— <br />— <br />Total <br />— <br />Ventilation <br />SQ. IN. of <br />of vented <br />IN. of <br />of <br />ventilation to <br />SQ. IN. of <br />SQ. IN. of <br />Ventilators <br />ventilation <br />soffit <br />ventilation <br />vented <br />be provided <br />Ventilation <br />Ventilation <br />See Elev <br />( ) <br />required <br />needed <br />required <br />soffit <br />by upper <br />needed <br />ventilators <br />53 8 <br />26 <br />2 <br />13 <br />— — <br />0.0 <br />0.0 <br />0.0 <br />1753 250 <br />876 <br />63 <br />438 <br />516.0 <br />— <br />240.0 <br />--- <br />276.0 <br />)NE-1 <br />fTIC SPACE <br />SQ. FT. <br />ROOF PLAN - ELEV-Al <br />SCALE: %4'=1'-0" <br />Attic Ventilation <br />Attic Ventilation to be in compliance with the Florida Building Code 7th Edition <br />(2020) Residential R806. <br />The Minimum net free ventilating area shall be 1/150 of the area of the vented <br />space. The ventilating area may be reduced to 1/300 provided that at least 40% <br />but no more than 50% of the required ventilation is provided in the upper portion of <br />the space to be ventilated. Upper ventilators shall be located no more than 3 feet <br />(measured vertically) below the ridge or highest point of the space, with the <br />balance of the required ventilation provided by eave or cornice vents. <br />"*CALCULATIONS BASED ON THE FOLLOWING VALUES, SEE ROOF PLAN'" <br />(Values to be verified with Manufacturer Specifications) <br />• OFF -RIDGE VENTS 138 SQ. IN. OF NET FREE AREA /UNIT <br />• SOFFIT VENTS 7 SO. IN. OF NET FREE AREA / SQ. FT. <br />• STUCCO SOFFIT VENTS 126 SO. IN. OF NET FREE AREA I S0. FT. <br />"If not enough vented soffit is provided due to fire protection, the contractor shall use the <br />following approved vents: <br />• LOMANCO DECK -AIR (Shingle Roof) - 9 S0. IN. OF NET FREE AREA / FT. <br />**Formula; (Sq. Ft. Soffit Needed) x 7 = (Sq. In. Needed) / 9 = Linear Ft. of Deck-PJr Needed) <br />c <br />ap o <br />N d -o <br />N e0 G <br />' N „ <br />