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ATTIC VENTILATION CALCULATIONS <br />- B1 (TRB) <br />Attic Ventilation <br />ATTIC VENTILATION REQUIRED <br />UPPER VENTILATION PROVIDED <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 />1/150 Rule <br />1/300 Rule <br />Ridge <br />Off -Ridge <br />space. The ventilating area may be reduced to 1/300 provided that at least 40% <br />(No Upper Ventilators <br />(Must Provide Upper Ventilators) <br />Vent Amt <br />Amt. <br />but no more than 50% of the required ventilation is provided in the upper portion of <br />q p pp <br />Req.) <br />(Ft.) <br />the space to be ventilated. Upper ventilators shall be located no more than 3 feet <br />Total <br />(measured vertically) below the ridge or highest point of the space, with the <br />Ventilation <br />balance of the required ventilation provided by eave or cornice vents. <br />ATTIC <br />SQ. FT. <br />SQ. IN. of <br />Provided <br />by Upper <br />-CALCULATIONS BASED ON THE FOLLOWING VALUES, SEE ROOF PLAN** <br />SPACE <br />SQ. IN. of SQ. FT. <br />Total SQ. <br />of <br />ventilation to <br />Ventilators <br />(Values to be verified with Manufacturer Specifications) <br />ventilation of vented <br />INof <br />vented <br />be provided <br />SQ. IN. of <br />SQ. IN. of <br />(See Elev) <br />. OFF -RIDGE VENTS 138 SQ. IN. OF NET FREE AREA / UNIT <br />required soffit <br />ventilation <br />soffit <br />by upper <br />Ventilation <br />Ventilation <br />• SOFFIT VENTS 7 SQ. IN. OF NET FREE AREA / SQ. FT. <br />needed <br />required <br />• STUCCO SOFFIT VENTS 126 SQ. IN. OF NET FREE AREA / SQ. FT. <br />needed <br />ventilators <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 SQ. IN. OF NET FREE AREA / FT. <br />**Formula: (Sq. Ft. Soffit Needed) x 7 = (Sq. In. Needed) / 9 = Linear Ft. of Deck -Air Needed) <br />Main 21 2 <br />Floor 2377 2282 326 1141 81 570 <br />(Zone 1) 315.0 276.0 <br />**NOTE** <br />GENERAL CONTRACTOR MUST ENSURE THAT PROPER VENTILATION IS PROVIDED AT EAVES/SOFFITS AS <br />REQUIRED BY FLORIDA BUILDING CODE 7TH EDITION (2020) RESIDENTIAL. <br />591.0 <br />ROOF PLAN — ELEV—Bl_ <br />SCALE: . -„o. <br />r <br />L�ttJ <br />I <br />f <br />w5T <br />ct y��(x'�;c 33 4'c <br />7i <br />.d. <br />\LN <br />To the best of the Engineer's knowledge, information and belief, <br />the structural plans and specifications <br />contained within these <br />drawings comply with the 2020 <br />Florida <br />Building Code - <br />Residential 7th Edition. Engineer's signature <br />and seal is only for <br />the structural engineering portions of the drawing pages bearing <br />Engineer's signature and seal. <br />M <br />W <br />O <br />� <br />r� <br />vE k 00 <br />M 8 N %k <br />O <br />N J <br />LL <br />m � J <br />ai <br />Q <br />U) ^ r J lJJ n. <br />N M V LL C6 Y <br />J LL LL a. LLI S <br />Z <br />_ Ys0 <br />. O 7 <br />W <br />�'ON tD Oca J J <br />Z <br />ILO <br />(1) c a <br />a <br />Z <br />L. N <br />M Z L0 O <br />U U � <br />W <br />El00 <br />(D <br />� <br />z <br />0 <br />� N <br />z <br />� � <br />a <br />N <br />M <br />� <br />z <br />c� <br />o <br />�1, <br />(� w <br />V <br />m <br />O <br />N <br />N <br />w <br />C <br />o <br />� <br />U) <br />U <br />W <br />r— <br />— <br />J <br />— E <br />� o <br />zj�•. <br />N <br />U <br />o � In 0 <br />t <br />N <br />14 <br />rD <br />CID <br />Z <br />CID <br />M <br />J <br />ZZ <br />o i <br />G <br />LL <br />z o <br />o 0 <br />} <br />4 <br />QE <br />E <br />O <br />v <br />Z® <br />O <br />� 0 <br />X U <br />¢ <br />UO <br />Q) <br />L <br />Wz¢Zomm <br />COn <br />C <br />z <br />0Y <br />U <br />ym <br />OU <br />oLL <br />Z <br />Qw <br />Vi <br />N <br />J <br />G� <br />N <br />oa <br />zz <br />no <br />!Z <br />w0 <br />¢o <br />�w <br />� <br />o� <br />r- <br />r3 <br />J <br />O <br />JW <br />Or <br />Y O <br />a <br />O' <br />y <br />^ <br />� L i <br />I..V <br />O <br />W <br />N <br />f6 <br />c� <br />L <br />� <br />o <br />M <br />� <br />N <br />aUi <br />Q <br />Y <br />' <br />O <br />O <br />m <br />Q0 <br />w <br />O <br />T <br />r <br />2 <br />N <br />T <br />i M <br />LO <br />00 <br />N <br />T <br />� CV <br />M <br />o <br />Z <br />z <br />E O <br />E <br />�; <br />a <br />ci0 <br />Q <br />o <br />c <br />JOB <br />NO: <br />21-1077 <br />SCALE : <br />AS NOTED <br />SHEET NO. <br />5 <br />