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Attic Ventilation Attic Ventilation to be in compliance with the Florida Building Code 5th Edition (2014) Residential R806. The Minimum net free ventilating area shall be 1/150 of the area of the vented space. The ventilating area may be reduced to 1/300 provided that at least 40% but no more than 50% of the required ventilation is provided in the upper portion of the space to be ventilated.Upper ventilators shall be located no more than 3 feet (measured vertically) below the ridge or highest point of the space, with the balance of the required ventilation provided by save or comics vents. "CALCULATIONS BASED ON THE FOLLOWING VALUES, SEE ROOF PLAN" VENTED SOFFIT 48 SQ. FT. (Values to be verified with Manufacturer Specifications) • RIDGE VENTS 15 SQ. IN. OF NET FREE AREA / LINEAR FT. • OFF -RIDGE VENTS 138 SQ. IN. OF NET FREE AREA / UNIT • SOFFIT VENTS 7 SQ. IN. OF NET FREE AREA / SQ. FT. ... .. • ••:::::::::::::.:: ...................................... :::::::::::::::::::::::::::.................................. � ...................................................'...... :. O'HAGIN WEATHEW�tASTER (Shingle R 72 SQ. IN. OF NET FREE AREA/ FT. •iii•iii•sss•sss•irs•s1.s.•sss•Sts•sis•sss•ir.0.•sss•sss•rii.•ass•.tie•lss•L:.t.•i?i•ss•sd..•iss•sss.•sss•sis•sti-Jss•ssL•sst.•sss•lss•sss•sss•sss•sss•sJs•ssS•ret•sst.• • ( n9 � ' • ••• '" (Sq. Ft. Soffit Needed) x 7 = (Sq. In. Needed) / 72 = Amount of alli gin Vents Needed • LOMANCO DECK -AIR (Shingle Roof) - 9 SQ. IN. OF NET FREE AREA / FT. • •� ZONE-3 �' '•• -Formula: (Sq. Ft. Soffit Needed) x 7 = (Sq. In. Needed) / 9 = Linear FL of Deck -Air Needed) • :.� f� ; •• • O'HAGIN (rile Roof) - 86.25 80. IN. OF NET FREE AREA / VENT r —Formula (Sq. Ft. Soffit Needed) x 7 = (Sq. In. Needed) 186.25 = Amount of allagin Vents Needed ATTIC SPACE 280 SQ. FT. . Q dCn •� �:. 00......................... ... . ;. O '.•� C, VENTED SOFFIT 42 SQ. FT. �::•. w LU ':i ZONE-4 .�i ATTIC SPACE : :1740 SQ. FT. :i Ci co 7.1 LU co ILL- Cn W '71 C0CD F..: LL i VENTED SOFFIT 26 SQ. FT. O �� -' W �•'• H �.:• ...................................: .. Z ... . • •• ::•: > �.'... Provided by ZONE-2 ZONE-1 F.:: �':.:: - SPACE ATTIC SPACE F•::: ATTIC 269 SQ. FT. F 45 SQ. FT. ........................... f: VENTED SOFFIT 15 SQ. FT. ::�� • • o •'� .� �.; •. fLJJ .:: H ..� �' L U ....... VENTED SOFFIT 70 SQ. FT, ROOF PLAN -A SCALE: %4"=1'-0" ATTIC VENTILATION CALCULATIONS - A ATTIC VENTILATION REQUIRED UPPER VENTILATION PROVIDED 1/150 Rule (No Upper Ven 1/300 Rule RidgeveMAmt z$ Z Z Q J d Z tn cD N '}'