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ATTIC VENTILATION CALCULATIONS - 131 <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 <br />Amt. <br />(Ft )mt <br />Total <br />Ventilation <br />ATTIC <br />Provided <br />SPACE <br />SQ. FT. <br />Total SQ. <br />SQ. FT. <br />SQ. IN. of <br />b Upper <br />y cape <br />SQ. IN. of <br />of vented <br />of <br />of <br />ventilation to <br />SQ. IN. of <br />SQ. IN. of <br />Ventilators <br />ventilation <br />soffit <br />nti <br />ventilation <br />vented <br />be provided <br />Ventilation <br />Ventilation <br />(See SElev) <br />required <br />needed <br />required <br />soffit <br />by upper <br />needed <br />ventilators <br />Main <br />21.00000 <br />2.000000 <br />Floor <br />2377 <br />2282 <br />326 <br />1141 <br />81 <br />570 <br />0 <br />591.0 <br />315.0 <br />1 276.0 <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 />ROOF PLAN <br />SCALE: 74 t=V-0" <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, shalt 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 contructions 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 11150 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 verged with Manufacturer Specifications) <br />• RIDGE VENTS 15 SO. IN. OF NET FREE AREA / LINEAR FT. <br />• OFF -RIDGE VENTS 138 SO. IN. OF NET FREE AREA / UNIT <br />• SOFFIT VENTS 7 SQ. IN. OF NET FREE AREA / SQ. FT. <br />• O'HAGIN WEATHERMASTER (Shingle Roof) - 72 SO. IN. OF NET FREE AREA/ FT. <br />** (Sq. Ft. Soffit Needed) x 7 = (Sq. In. Needed) / 72 - Amount of O'Hagin Vents Needed <br />• LOMANCO DECK -AIR (Shingle Roof) - 9 SO. 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 />• O'HAGIN (Tile Roof) - 86.25 SQ. IN. OF NET FREE AREA / VENT <br />"Formula: (Sq. Ft. Soffit Needed) x 7 = (Sq. In. Needed) / 86.25 = Amount of O'Hagin Vents Needed <br />0r <br />Z M <br />-o <br />z�z <br />Q <br />a <br />4--J cry <br />w <br />.0 <br />O 07�, <br />t/) <br />f'a U <br />0 <br />00 <br />9� M <br />wo,59-,-, <br />000 <br />_ <br />U <br />C * <br />rno <br />1 t` o <br />a,� <br />v <br />Q <br />BI <br />`_a:Df c <br />*#//F <br />0 <br />Xay���,� iN <br />Le <br />sP� <br />A• .... •',O <br />To the best of the is now ge, i ion, and <br />belief, the structural p !(�}Igiontained <br />within these drawings comp 4 17 Florida <br />Building Code - Residential 6th Edition. Engineer's <br />signature and seal is only for the structural engineering <br />portions of the drawing pages bearing Engineer's signature <br />and seal. <br />0 <br />Z N <br />0 � N <br />> � CO O <br />M <br />a `-v `n <br />a tn•�� <br />0" <br />a° <br />M <br />lY U o. 0 <br />a E <br />Z r0 <br />WJ <br />tD <br />J <br />wo <br />z ca. <br />airy <br />E SQ <br />I fflW <br />..A <br />V ro Z <br />g <br />0 <br />7g8 <br />O <br />S <br />oU <br />fu <br />ai <br />o LL <br />o <br />LL <br />. <br />. <br />0 <br />N'F <br />$ 0 <br />s� <br />Z <br />LUQ <br />N <br />9�2 <br />J <br />,Ln-t <br />W <br />6i <br />a <br />V <br />Q <br />z <br />z z <br />Ln <br />z <br />Z <br />m <br />g <br />LIJ <br />t <br />o <br />� <br />SCALE : AS NOTED <br />DATE : 1 /4/2018 <br />TECH: ERAND <br />VERSION No' 10 <br />SHEET NO. <br />5.0 <br />