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ATTIC VENTILATION CALCULATIONS - 131 (TRB) ATTIC VENTILATION REQUIRED UPPER VENTILATION PROVIDED 1/150 Rule Ridge (No Upper Ventilators (Mu1/300 Rule Off -Ridge Vent Amt st Provide Upper Ventilators) Amt. Req.) (Ft.) ATTIC SPACE SQ. IN. of ventilation required SQ. FT. of vented soffit needed Total SQ. IN. of ventilation required SQ. FT. of vented soffit needed SQ. IN. of ventilation to SQ. IN. of be provided Ventilation by upper ventilators - Total Ventilation Provided by Upper SQ. IN. of Ventilators Ventilation (See Elev) Main 22 2 - Floor 1999 1919 274 960 69 480 _. (Zone 1) 330.0 276.0 "NOTE" GENERAL CONTRACTOR MUST ENSURE THAT PROPER VENTILATION IS PROVIDED AT EAVES/SOFFITS AS REQUIRED BY FLORIDA BUILDING CODE 7TH EDITION (2020) RESIDENTIAL. 606.0 ROOF PLAN - ELEV-Bl SCALE: %4"=1'-0" Attic Ventilation Attic Ventilation to be in compliance with the Florida Building Code 7th Edition (2020) 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 eave or cornice vents. "CALCULATIONS BASED ON THE FOLLOWING VALUES, SEE ROOF PLAN"' (Values to be verified with Manufacturer Specifications) • OFF -RIDGE VENTS 138 SQ. IN. OF NET FREE AREA / UNIT • SOFFIT VENTS 7 SQ. IN, OF NET FREE AREA / SO. FT. • STUCCO SOFFIT VENTS 126 SQ. IN. OF NET FREE AREA / SQ. FT. 'If not enough vented soffit is provided due to fire protection, the contractor shall use the following approved vents: • LOMANCO DECK -AIR (Shingle Roof) - 9 SQ. IN. OF NET FREE AREA / FT. "Formula: (Sq. Ft. Soffit Needed) x 7 = (Sq. In. Needed) 19 = Linear Ft. of Deck -Air Needed) cif i' V a ,\ To the best of the Engineers knowledge, Information and belief, the structural plans and specifications Contained within these drawings comply with the 2020 Florida Building Code - Residential 7th Edition. Engineers signature and seal Is only for the structural engineering portions of the drawing pages bearing Engineers signature and seal ao M C." N i! J C mud # LL M V7 n I �Mst R LL Lu - R Y a 2 LL a Z L yo 7s015 S _ Ir f0 _ f0 N to } R O J R Z IL N M Z R cn O U�U ZOU ❑ ❑ ❑ W CD N 7 z r J U) d N r N h U LC3 N 4--' U, p a A U O w s ~ r3 � d U � c Go Go N � t` O � W M � ZZZ s U_ E i o ao aY z® O E v F— CL wa �o Z o E c4 t g0 4o K� N @ C� � aq m0 rp O-Z z � j m� m Z 2 t/� �On fn < a UO3 �U JU �a a `0 S U Q 2IF UU °O = O CO `` 0 L c N m r1 �y O v C in U r Lo CU CD = N T LW 'T� N c_V N N T T .L 00 ai E = N 0 M Z E O Ecc FL E U ° Q p JOB NO: 21-1076 SCALE : AS NOTED SHEET NO. 5