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ROOF NOTES <br />Q <br />00 <br />ti <br />0 <br />0 <br />CV <br />0 <br />CV <br />N <br />L: <br />X <br />a) <br />co <br />I <br />z <br />I <br />a) <br />U <br />U <br />I <br />L <br />a) <br />L <br />O <br />U <br />0 <br />LL <br />I- <br />N <br />e0 <br />a) <br />E <br />U <br />O <br />0 <br />X <br />a) <br />g <br />U <br />L <br />A <br />ATTIC VENTILATION CALCULATIONS <br />ATTIC AREA: 3,956,917 S.I (27,478.59 SF) <br />CEILING ASSEMBLY AT BOTTOM CHORD OF ROOF <br />TRUSSES INCLUDES CLASS II VAPOR BARRIER. <br />REQUIRED VENTILATION @ 1/300 (IBC SECTION 1203.2 <br />EXCEPTION 2): 13,189.72 S.I. (91.6 S.F.) <br />EAVE VENTILATION: 498.45 L.F. (5,981.38 L.I.) <br />• BIRD BLOCKING WITH THREE 2" DIAMETER <br />HOLES PER TRUSS BAY W/ 1/8" MESH SCREEN <br />2.50 S.I. (.0174 S.F.)NFA PER NOTCH. SEE <br />DIAGRAM 1/A501 3.75 S.I.(.026 S.F.) NET FREE <br />AREA PER LINEAL FOOT = 1,866.19 S.I. (12.96 <br />S.F.) TOTAL. <br />CONTINUOUS SOFFIT VENTILATION: 320.42 L.F. (3,845 <br />L.I.) <br />• STRIP VENT WITH 2" WIDE ON BALCONY <br />CEILING WITH 1/8" MESH SCREEN. 18.72 <br />S.I.(.13 S.F.) NET FREE AREA PER LINEAL <br />FOOT = 5,998.26 S.I. (41.65 S.F.) <br />CONTINUOUS RIDGE VENTILATION: 670.4 L.F. <br />• COR-A-VENT REVOLUTION @ 10 S.I. NET PER <br />FT. = 667.4 * 10 S.I./FT = 6,704 S.I. (46.55 S.F.) <br />TOTAL <br />TOTAL PROVIDED VENTILATION: 1,866.19 S.I + 5,998.26 <br />S.I + 6,704 S.I. = 14,568.45 S.I. (101.17 S.F.) <br />• EAVE & SOFFIT VENTS: (1,866.19 + 5,998.26 / <br />13,189.72)*100 = 59.62% <br />• RIDGE VENTS: (6,704 / 13,189.72)*100 = 50.82% <br />VENTILATION ALSO MEETS IBC SECTION 1203.2 <br />EXCEPTION 1 <br />C.101 <br />C.g C.j C.k C.n <br />i <br />c _ <br />1 1 N O <br />C.g A330 A431 C•j C. C.n <br />IDS <br />1. SEE STRUCTURAL DRAWINGS <br />FOR ROOF FRAMING. <br />2. ALL ROOFING TO BE CLASS B <br />MINIMUM PER IBC SECTION 1505 AND <br />TABLE 1505.1. <br />3. ALL ROOF SLOPES ARE 4 1/8"/FT. U.N.O <br />4. ALL ROOF OVERHANGS ARE 1'-0" U.N.O <br />5. DRAFTSTOPS ARE NOT REQUIRED <br />C•$ IN BUILDINGS EQUIPPED WITH AUTOMATIC <br />SPRINKLER SYSTEMS PER IBC SECTION <br />903.3.1.1 (NFPA 13) <br />6. PER IBC SECTION 708.4, IN <br />1 A333 COMBUSTIBLE CONSTRUCTION WHERE <br />THE FIRE PARTITIONS ARE NOT REQUIRED <br />TO BE CONTINUOUS TO THE SHEATHING, <br />DECK OR SLAB, THE SPACE BETWEEN THE <br />CEILING AND THE SHEATHING, DECK OR <br />SLAB ABOVE SHALL BE FIRE BLOCKED OR <br />DRAFTSTOPPED IN ACCORDANCE WITH IBC <br />SECTIONS 718.2 AND 718.3 AT THE <br />PARTITION LINE. EXCEPTION #6: <br />FIREBLOCKING OR DRAFTSTOPPING IS NOT <br />REQUIRED AT THE PARTITION LINE IN <br />BUILDINGS EQUIPPED WITH AN AUTOMATIC <br />SPRINKLER SYSTEM INSTALLED <br />THROUGHOUT IN ACCORDANCE WITH IBX <br />SECTION 903.3.1.1... PROVIDED THAT <br />AUTOMATIC SPRINKLERS ARE INSTALLED <br />IN COMBUSTIBLE FLOOR/CEILING AND <br />ROOF/CEILING SPACES. <br />7. DRAFTSTOPPING MATERIALS TO <br />BE 1/2" GYP. SHEATHING OR 1/2" PLYWOOD <br />10 OR OSB SHEATHING PER IBC SECTION <br />718.3.1. <br />8. PER IBC SECTION 1203.2 EXCEPTION: <br />THE NET FREE CROSS -VENTILATION AREA <br />SHALL BE PERMITTED TO BE REDUCED TO <br />1/300 PROVIDED BOTH OF THE FOLLOWING <br />CONDITIONS ARE MET: <br />1. IN CLIMATE ZONES 6, 7, AND 8, A CLASS I <br />OR II VAPOR RETARDER IS INSTALLED ON <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 <br />VENTILATORS LOCATED IN THE UPPER <br />PORTION OF THE ATTIC OR RAFTER SPACE. <br />UPPER VENTILATORS SHALL BE LOCATED <br />NOT MORE THAN 3 FEET BELOW THE RIDGE <br />OR HIGHEST POINT OF THE SPACE, <br />MEASURED VERTICALLY, WITH THE BALANCE <br />OF THE VENTILATION PROVIDED BY EAVE OR <br />CORNICE VENTS. WHERE THE LOCATION OF <br />WALL OR ROOF FRAMING MEMBERS <br />CONFLICTS WITH THE INSTALLATION OF <br />UPPER VENTILATORS, INSTALLATION MORE <br />THAN 3 FEET BELOW THE RIDGE OR <br />HIGHEST POINT OF THE SPACE SHALL BE <br />PERMITTED. <br />9. BATHROOMS SHALL BE <br />MECHANICALLY VENTILATED IN <br />ACCORDANCE WITH THE IMC PER IBC <br />SECTION 1203.5.2.1. <br />COMPOSITION SHINGLE ROOFING <br />TO MEET ASTM D7158 CLASS G OR <br />H, OR ASTM D3161 CLASS F ORVER <br />ONE LAYER OF UNDERLAYMENT, <br />TYP. REFER TO MANUFACTURER'S <br />REQUIREMENTS <br />2 A333 <br />CUT 18" x 18" OPENINGS IN MAIN <br />ROOF SHEATHING TO ALLOW <br />VENTING OF OVERFRAMED AREAS <br />ICE & WATER SHIELD, TYP. <br />EXTEND 24" PAST FACE <br />OF EXTERIOR WALL <br />SEE 12/XBE 6.00 TYP. <br />6" PREFINISHED ALUMINUM <br />K-STYLE GUTTERS <br />�.141 KEY PLAN <br />VENT CAP FOR TOP FLOOR <br />UNITS, TYP. ADJUST LOCATIONS <br />IN FIELD TO AVOID CONFLICTS <br />WITH SOLAR HW AND SOLAR PV <br />SYSTEM COMPONENTS. <br />OHNSON BRAUNDINC. <br />15200 52nd Ave. South <br />Suite 300 <br />Seattle, WA 98188 <br />Phone 206.766.8300 <br />www.johnsonbraund.com <br />ARCHITECTURE <br />INTERIOR DESIGN <br />Greg L. Allwine, <br />Jeffrey A. Williams, <br />8556 <br />REGISTERED <br />ARCHITECT <br />eFFREY THUR WILLIAM wnsHiNCTON <br />STAMP <br />Q <br />0m <br />�U) <br />U)� <br />LULU <br />ww <br />o <br />a <br />Uj <br />0 <br />N <br />W <br />Q <br />o <br />co <br />o <br />c <br />0 <br />.Q- <br />N <br />d <br />0 <br />d <br />ca <br />0 <br />d <br />U) <br />t <br />M <br />O <br />Q� <br />N <br />a0 <br />N O <br />V / <br />L <br />�Q <br />A+ <br />W <br />> <br />W <br />O <br />ai <br />N <br />L <br />> <br />0 <br />w <br />z <br />U 0 <br />U <br />J J (n O <br />L <br />a00 <br />cn- 0 Q <br />00 <br />Q <br />o <br />Q <br />w <br />w .) z ai <br />z o (1) <br />l0w <br />w <br />O ii ( m <br />PROJECT #: 1827 <br />DRAWN BY: AT <br />CHECKED BY: ST <br />BLDG C - ROOF SOUTH <br />w <br />Q <br />z <br />w <br />J_ <br />LL <br />BUILDING C �n A236A <br />PERMIT SET 10/09/2020 <br />