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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 />SO. IN. of <br />by Upper <br />SQ. IN. of <br />ovene <br />f 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 <br />SElev) <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 />2719 <br />2610 <br />373 <br />1305 <br />93 <br />653 <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 />ca <br />0 <br />c <br />N <br />n <br />LO <br />10 <br />N <br />rn <br />M <br />rn <br />2 <br />E <br />d- <br />II...I dFooll 111111111 11111 1111111 <br />U <br />f <br />SCALE: %4'=1 L-0LL <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 />I Attic Ventilation <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 / SO. 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) / 9 = Linear Ft. of Deck -Air Needed) <br />U <br />CJ `r <br />;zo <br />N <br />z� <br />V) (D <br />QJ <br />C <br />w <br />M <br />�V — <br />OLU <br />n3 ~ <br />C) <br />CD <br />W <br />s. sE�.•� 1--- ° <br />N <br />N M <br />CoC <br />NUN <br />N <br />O O <br />U1 <br />O <br />Q <br />L LL 00 <br />� fl O <br />0) <br />0 v <br />rn Q o <br />B D. <br />N�Nc <br />N �D <br />♦/� O. M 6 t: ONO <br />' <br />Z Lu M N W Z W z <br />LL <br />LU <br />LU LL po a <br />Zp�2 <br />�Q <br />as • � O U U` <br />�; <br />.b CAM'h A <br />a ,g <br />D. <br />\0, Qw <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. Engineer's 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 33.607 <br />www.LennarTampa.com <br />OZ <br />O <br />Lu <br />zna <br />w¢ir[r <br />�400 <br />zuJ <br />60Zz <br />�0�LuWOE <br />CC R <br />OU N <br />w <br />z �Q <br />\` <br />Q <br />Z <br />� z <br />z <br />�L.—V <br />-0 <br />fu <br />U_ <br />O <br />o <br />O <br />�w <br />[V <br />W * . <br />o O Z <br />U 0QQ Q <br />0 <br />J <br />f 0 U <br />N¢Z <br />J0 <br />k <br />00 <br />oQ�of <br />0 <br />Z <br />tV <br />w <br />9�62� <br />w w <br />zo <br />11 J <br />n F <br />LLh <br />¢ <br />z <br />$¢o <br />k <br />N <br />z <br />z <br />a o 0 <br />C� <br />rn <br />('t <br />`+ " <br />LI J <br />Z <br />- z <br />¢ E <br />,-'-I <br />a <br />U0 <br />o <br />SCALE : AS NOTED <br />DATE : 4/5/2019 <br />TECH: )BERCHAL <br />VERSION NO. 4x2 <br />SHEET NO. <br />5.1 <br />