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Attic Ventilation <br />Attic Ventilation to be in compliance with the Florida Building Code 5th Edition <br />(2014) 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 o <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 />slues to be verified with Manufacturer Specifications) <br />• RIDGE VENTS 15 0 IN. SQ . F NET FREE AREA /LINEAR FT. <br />• OFF RIDGE VENTS 8 S <br />13 Q. IN. OF NET FREE AREA /UNIT <br />. <br />........................................................................................................................ .. <br />......... ... ........................... .......... <br />...: <br />• SOFFIT VENTS 7 SQ. IN. OF NET FREE AREA / SQ. FT. <br />1 <br />*If not enough vented soffit is provided due to fire protection, the contractor shall use the <br />following approved vents: <br />:: <br />VENTEDSOFFIT 50 SQ. FT. <br />• "' <br />• LOMANCO DECK -AIR (Shingle Roof) - 9 SQ. IN, OF NET FREE AREA / FT. <br />**Formula: (Sq. Ft. Soffit Needed) x 7 = (Sq. In. Needed) / 9 = Linear Ft. of peck -Air Needed) <br />�:�� <br />• • • • <br />�: <br />• O'HAGIN (Tile Roof) - 86.25 SQ. IN. OF NET FREE AREA / VENT <br />.'j <br />• <br />�•� <br />**Formula: (Sq. Ft. Soffit Needed) x 7 = (Sq. In. Needed) / 86.25 = Amount of O'Hagin Vents Needed <br />ZONE-1 <br />�A <br />ATTIC SPACE <br />r: <br />•'>. <br />..� <br />•'j <br />3235 SQ. FT. <br />�•. <br />7.7 <br />LL. <br />A <br />� <br />n <br />t'• <br />� <br />LL <br />LL- <br />O <br />�•� <br />`�• <br />O <br />Cn <br />w <br />F— <br />,;:j <br />�':. <br />�LU '7.7 <br />%J <br />r <br />A <br />o-i <br />.'J <br />r:: <br />r�: <br />{': <br />ATTIC VENTILATION CALCULATIONS -A <br />�.: <br />a <br />r:: <br />.' <br />�•. <br />�•: <br />'�� <br />`'. <br />.' <br />�•: <br />.'� <br />A <br />�.� <br />•'� <br />:•j <br />•.� <br />.'� <br />:•� <br />.'j <br />- <br />��: <br />- <br />ROOF PLAN-A <br />VENTED SOFFIT 59 SQ. FT. <br />SCALE: %4"=1'-0" <br />ATTIC VENTILATION REQUIRED <br />UPPER VENTILATION PROVIDED <br />1/150 Rule <br />1/300 Rule <br />Ridge Vent Amt <br />(No Upper Ventilators <br />(Must Provide Upper Ventilators) <br />(Ft.) <br />zM <br />00 <br />z� <br />z� <br />Q <br />J <br />Z <br />O <br />W <br />i <br />