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ATTIC VENTILATION CALCULATIONS - B <br />ATTIC VENTILATION REQUIRED <br />UPPER VENTILATION PROVIDED <br />1/150 Rule <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 />Total <br />Ventilation <br />ATTIC <br />Provided <br />SPACE <br />SQ. FT. <br />Total SQ. <br />SQ. FT. <br />SQ. IN. of <br />by Upper <br />SQ. IN. of <br />of vented <br />IN. of <br />of <br />ventilation toSQ. <br />IN. of <br />IN. of <br />Ventilators <br />ventilation <br />soffit <br />ventilation <br />vented <br />be provided <br />Ventilation <br />tilation <br />tilation <br />Ventilation <br />(SElev) <br />(See <br />required <br />needed <br />required <br />soffit <br />by upper <br />needed <br />ventilators <br />Main <br />23.0 <br />1.0 <br />Floor <br />2002 <br />1922 <br />275 <br />961 <br />69 <br />480 <br />483.0 <br />345.0 <br />138.0 <br />(Zone 1) <br />**NOTE** <br />GENERAL CONTRACTOR MUST ENSURE THAT PROPER VENTILATION IS PROVIDED AT EAVES/SOFFITS AS <br />REQUIRED BY FBC 6th ED. RESIDENTIAL. <br />SCALE: %4"=1r-o° <br />General Notes <br />ROOF CRITERIA: <br />• 12" OVERHANG U.N.O. <br />• PLUMB CUT FASCIA ROOF <br />• PITCH PER ELEVATION <br />**G.C. VERIFY ROOF PITCH** <br />ROOF PITCH VARIES PER SUBDIVISIONS IT IS THE <br />CONTRACTORS RESPONSIBILITY TO VERIFY <br />ROOF SLOPE REQUIREMENTS WITH TRUSS <br />MANUFACTURER. <br />**ELECTRICAL SPECIFICATION NOTES** <br />ELECTRICAL CONTRACTOR MUST VERIFY WITH <br />THE SPECIFICATIONS FOR THE TYPE OF FIXTURE <br />TO BE USED. LIGHT FIXTURES SHOWN ARE FOR <br />LOCATION PURPOSES. <br />Exterior Covering <br />R703.7 Exterior plaster. <br />Installation of these materials shall be in compliance with ASTM C <br />926 and ASTM C 1063. <br />R703.7.1 Lath. <br />All Lath and lath attachments shall be of corrosion -resistant <br />materials. Attached per ASTM C 1063. <br />R703.7.2 Plaster. <br />Plastering w/ portland cement plaster shall be not less than three <br />coats when applied over metal lath or wire lath and shall be not <br />less than two coats when applied over masonry, concrete. <br />R703.7.3 Water-Resisitive Barriers. <br />Water-resisitive barriers shall be installed where cement plaster <br />(stucco) is to be applied over wood -based sheathing, shall include <br />a water -resistive vapor -permeable barrier. The individual layers <br />shall be installed independently such that each layer provides a <br />separate continuous plane and any flashing intended to drain to <br />the water -resistive barrier is directed between the layers. The <br />barriers shall consist of one of the following. <br />1. Two layers of an approved water resistant barrier material in <br />accordance with R703.2. <br />2. One layer of an approved water -resistive barrier (paperbacked <br />stucco lath) over an approved synthetic house wrap. <br />R703.4 Flashing. <br />Approved corrosion -resistant flashing shall be applied <br />shingle -fashion in a manner to prevent entry of water into the wall <br />cavity or penetration of water to the building structural framing <br />components. Flashing shall be installed at the following locations. <br />• Exterior window/door openings. <br />• Intersection of chimneys or other masonry construction with <br />frame walls. <br />• Under and at the ends of masonry, wood or metal copings <br />and sills. <br />• Continuously above all projecting wood trim. <br />• Where exterior porches, decks or stairs attach to a wall or <br />floor assembly of wood -frame construction. <br />• At wall and roof intersections <br />• At Built-in gutters. <br />Attic Ventilation I <br />Attic Ventilation to be in compliance with the Florida Building Code 6th Edition <br />(2017) 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 />(Values to be verified with Manufacturer Specifications) <br />• OFF -RIDGE VENTS 138 SQ, IN. OF NET FREE AREA / UNIT <br />• SOFFIT VENTS 7 SQ. IN. OF NET FREE AREA / SQ. FT. <br />*If not enough vented soffit is provided due to fire protection, the contractor shall use <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) 19 = (Linear Ft, of Deck -Air Needed) <br />M� o� <br />0 <br />0�2 <br />z Cl) <br />0 <br />z CD <br />z <br />E3 <br />U) <br />CZV) <br />0 <br />Q) N <br />W <br />.V <br />0 W <br />0:: <br />Ey <br />v <br />o 0 <br />CD <br />m 'M <br />W E <br />1-- <br />®E12- <br />N M <br />CA CU <br />O C"! <br />U <br />L 00 <br />U_ 00 <br />� Y <br />Q CD <br />U3 Y r. <br />Lo O <br />rn Q d <br />8 <br />N­� B­ <br />• <br />O W <br />p O �k <br />o d d <br />' Z <br />W ^0 a <br />_ {,� �+ oo z w z <br />N Pl <br />I I• " C <br />�_ <br />- <br />W V E �� o a <br />z -2 ��¢_ <br />90W <br />Q o 0 <br />kzD <br />6' K. <br />LIL Q <br />WAId <br />�� O �U O <br />N, Cj W i y'Ar <br />�°� RWVWe 9EIe6.C,OM 14 r <br />�• *A <br />**� <br />Y��� <br />Zz ILL- <br />Zz V 0** y �\ <br />°��, '•®, �° Vie° ^a."' y� �� <br />F ,�Y4 <br />To the best of the Engineer's knowledge, information and belief, <br />the structural plans and specifications contained within these <br />drawings comply with the 2017 Florida Building Code - <br />Residential 6th Edition. Engineers signature and seal is only for <br />the structural engineering portions of the drawing pages bearing <br />Engineer's signature and seal. <br />4600 W. Cypress St, Suite 200 1 Tampa, FL 33607 <br />www.LennarTampa.com <br />oz <br />O <br />of <br />�F <br />LLJ <br />Uzoo <br />oo�0 <br />=owz <br />�o�w <br />aw0� <br />OW V N <br />O <br />O � <br />2O <br />U <br />o <br />a <br />z <br />N%../ <br />3 <br />D <br />F <br />u <br />*-� <br />z <br />z <br />o <br />Ln <br />M <br />J W <br />� <br />o0 Z <br />1Jro <br />o <br />I� <br />4 U <br />0 <br />�O <br />O�a <br />O <br />v <br />oao; <br />N <br />z<Za <br />a< <br />Q002E <br />0 <br />z <br />�.o�E <br />z <br />J <br />N <br />W <br />E CY 2 <br />FZo <br />W <br />S <br />Ln <br />Q <br />z <br />U. <br />ix < z <br />k <br />N <br />z <br />)o0 <br />0 <br />C� <br />z <br />= <br />jV) <br />ag <br />SCALE : AS NOTED <br />DATE : 4/5/2019 <br />TECH: JBERCHAL <br />VERSION NO. 3ol <br />SHEET NO. <br />5.1 <br />