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a ATTIC VENTILATION CALCULATIONS ROOF NOTES <br /> ATTIC AREA:2,575,008 S.I(17,882 SF) <br /> CEILING ASSEMBLY AT BOTTOM CHORD OF ROOF a TRUSSES INCLUDES CLASS II VAPOR BARRIER. 1. SEE STRUCTURAL DRAWINGS 4v <br /> REQUIRED VENTILATION @ 1/300(IBC SECTION 1203.2 FOR ROOF FRAMING. <br /> EXCEPTION 2):8,583 S.I.(59.6 S.F.) 2. ALL ROOFING TO BE CLASS OHNSON BRAUNDINC. <br /> EAVE VENTILATION:770'L.F. 110,880 L.I. MINIMUM PER IBC SECTION 1505 AND 15200 52nd Ave.South <br /> ( ) TABLE 1505.1. Suite 300 <br /> • BIRD BLOCKING WITH THREE 2"DIAMETER HOLES Seattle,WA 98188 <br /> PER TRUSS BAY W/1/8"MESH SCREEN 2.50 S.I. 3. ALL ROOF SLOPES ARE 4 1/8"/FT.U.N.O phone 206.766.8300 <br /> (.0174 S.F.)NFA PER NOTCH.SEE DIAGRAM 4/A500 4. ALL ROOF OVERHANGS ARE V-0"U.N.O —phnsonhraund- <br /> 3.75 S.I.(.026 S.F.)NET FREE AREA PER LINEAL 5. DRAFTSTOPS ARE NOT REQUIRED ARCHITECTURE <br /> FOOT=19,664 S.I.(13.66 S.F.)TOTAL. IN BUILDINGS EQUIPPED WITH AUTOMATIC <br /> SPRINKLER SYSTEMS PER IBC SECTION INTERIOR DESIGN <br /> CONTINUOUS SOFFIT VENTILATION:261 L.F.(37,584 L.I.) 903.3.1.1(NFPA 13) Gregg L.A'I.., <br /> • STRIP VENT WITH 2"WIDE ON BALCONY CEILING Jeffrey A.Williams, <br /> WITH 1/8"MESH SCREEN.NET FREE AREA PER 6. PER IBC SECTION 708.4,IN <br /> LINEAL FOOT=4,885 S.I.(33.9 S.F.) COMBUSTIBLE CONSTRUCTION WHERE <br /> THE FIRE PARTITIONS ARE NOT REQUIRED <br /> CONTINUOUS RIDGE VENTILATION:689 L.F. TO BE CONTINUOUS TO THE SHEATHING, <br /> • COR-A-VENT REVOLUTION @ 12 S.I.NET PER FT.= DECK OR SLAB,THE SPACE BETWEEN THE <br /> 544.45*12 S.I./FT=6,88.5 S.I.(47.8 S.F.)TOTAL CEILING AND THE SHEATHING,DECK OR <br /> SLAB ABOVE SHALL BE FIRE BLOCKED OR <br /> TOTAL PROVIDED VENTILATION:19,664 S.I+4,886 S.I+ DRAFTSTOPPED IN ACCORDANCE WITH IBC <br /> 19,66 S.I.=13,737 S.I.(95 S.F.) SECTIONS 718.2 AND 718.3 AT THE <br /> • EAVE 8.SOFFIT VENTS:(19,664+4,885/2,575,008)• PARTITION LINE.EXCEPTION#6: <br /> 100=79% FIREBLOCKING OR DRAFTSTOPPING IS NOT <br /> • RIDGE VENTS:(6,885/2,575,008)*100=80% REQUIRED AT THE PARTITION LINE IN <br /> BUILDINGS EQUIPPED WITH AN AUTOMATIC <br /> VENTILATION ALSO MEETS IBC SECTION 1203.2 SPRINKLER SYSTEM INSTALLED <br /> EXCEPTION 1 THROUGHOUT IN ACCORDANCE WITH IBX ass. <br /> SECTION 903.3.1.1.,.PROVIDED THAT REGISTERED <br /> AUTOMATIC SPRINKLERS ARE INSTALLED ARCHITECT <br /> IN COMBUSTIBLE FLOOR/CEILING AND - <br /> ROOF/CEILING SPACES. <br /> 7. DRAFTSTOPPING MATERIALS TO exaev>aTxors wnJJAM <br /> BE 1/2"GYP.SHEATHING OR 1/2"PLYWOOD sTATe av wnswxcTox <br /> OR OSB SHEATHING PER IBC SECTION <br /> 718.3.1. <br /> STAMP <br /> 8. PER IBC SECTION 1203.2 EXCEPTION: <br /> THE NET FREE CROSS-VENTILATION AREA <br /> SHALL BE PERMITTED TO BE REDUCED TO k <br /> 11300 PROVIDED BOTH OF THE FOLLOWING <br /> CONDITIONS ARE MET: <br /> 1.IN CLIMATE ZONES 6,7,AND 8,A CLASS I e E <br /> OR II VAPOR RETARDER IS INSTALLED ON o <br /> THE WARM-IN-WINTER SIDE OF THE CEILING. <br /> 2.AT LEAST 40 PERCENT AND NOT MORE <br /> THAN 50 PERCENT OF THE REQUIRED <br /> VENTING AREA IS PROVIDED BY a <br /> VENTILATORS LOCATED IN THE UPPER ru o$ <br /> PORTION OF THE ATTIC OR RAFTER SPACE. <br /> UPPER VENTILATORS SHALL BE LOCATED <br /> 2-HOUR STAIR ENCLOSURE <br /> FRAMING CONTINUOUS NOT MORE THAN 3 FEET BELOW THE RIDGE <br /> UNDERSIDE OF ROOF SHEATHING. 5 OR HIGHEST POINT OF THE SPACE, <br /> A311 MEASURED VERTICALLY,WITH THE BALANCE <br /> STAIR ENCLOSURE ROOF FRAMING <br /> A.a A412 A.B OF THE VENTILATION PROVIDED BY EAVE OR <br /> TO BE ENTIRELY INDEPENDENT OF <br /> MAIN ROOF FRAMING CORNICE VENTS.WHERE THE LOCATION OF <br /> 1 WALL OR ROOF FRAMING MEMBERS <br /> HOOD FOR STAIRWELL CONFLICTS WITH THE INSTALLATION OF <br /> PRESSURIZATION FAN UPPER VENTILATORS,INSTALLATION MORE <br /> THAN 3 FEET BELOW THE RIDGE OR `u <br /> HIGHEST POINT OF THE SPACE SHALL BE d <br /> iv=O c= PERMITTED. <br /> iv p `O= 9. 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VENT CAP FOR TOP FLOOR CUT 18"x 18"OPENINGS IN MAIN DRAWN BY: AT <br /> N EXTEND 24"PAST FACE UNITS,TYP.ADJUST LOCATIONS ROOF SHEATHING TO ALLOW <br /> OF EXTERIOR WALL IN FIELD TO AVOID CONFLICTS VENTING OF OVERFRAMED AREAS CHECKED BY: ST <br /> g Aa SEE 12/XBE 6.00 TYP. WITH SOLAR HW AND SOLAR PV Ae <br /> so COMPONENTS. <br /> so BLDG A-ROOF PLAN <br /> Ci <br /> WEST <br /> w A216A <br /> BUILDINGA <br /> �1 BLDG A-ROOF PLAN WEST PERMIT\�/\I PERMIT SET 10/09/2020 <br /> z <br /> w <br /> u= 1/8"=T-0" <br />