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AL JAL *1 49�1Z• .0 1 J LA ! 0-'T �J� q — iKm Roof Dom: tl only aver swell -seasoned, supported wood deck, tightly constructed with rnaxitmttm 6" vide lumber* having adequate nail -holding capacity. Plywood decking as recommended by the Engineered Wood Association Is acceptable. For ridge vent to function property, it mast be the only high or exhaust vent for the vented attic space. Ridge vents will not function property it used in conjunction with gable -send louvers, turbines, roof vet or power vents. Slope Restrictions: Use only on slopes between 3/12 and 16/12 STEP 1 Calculations for a Balanced Ventilation system To achieve a "balanced system" with Cobra,9 Ridge AunnWr dge vent, there must be an air intake system (i.e., softh or undereave rents). For peeper ventilatien, the amount of undereave vertWAlon must equal the amount of ventitedw at the ridge. : to no case should the amount of exhaust vetaiilatkrn exceed the amount of intake ventilation.. To determine the minimum sgme feet o} net free ventilating area JNFVA) needed for a balamed ventilation system, use the follower terrrnft; Seq. ft. of ad% floor space = Min. Sq. fl. of NFVA needed 300 Cobra* Ridge Runra r"ridge vend has 12.5 square inches of NFVA per lineal toot. To defermWe how many feet of Cobra" Ridge Runnler'ridgo vent is needed, use the following formula" 1/2 x (Min. Sq. f. of NFVA needed) x 144112.5 = Min. lineal feet of ridge vent needed To determinm the amount of undereave vent required, use the following formula: X = NFVA (Sq. In, per. tin, ft.) of the undereave went of Intake vent system selected 1/2 x (Min. Sq. Ft. of NFVA needed) x 1441X = Min. lineal feet of undereave STEP 2 veent needed Instruction For Slots Alter calculatiq the tufal length of Cobra* fudge Runner -ridge vent needed, determine the necessary slot opening requct. mote:11 insUllkig can an existing roof, remove the carp shingles from are ride. Roofs withal a ridge board: cut all opening along the ridge, N" on each side of the roof ridge (Figure A). Roofs with a ride board: cut an opening along the ride, 1Y." on each side of the roof ridge (Figure 8). Note: Maximum slot opening is 3%„' wide. Mark off and cut the slant opening, making sure that the ends of the opening stop at least t `from any end walls or hip Intersections and 12" from chimneys (Figure C). Where short ridges (dormers, ridge Intersections) ate used, mark and cut the slot making sure that the WO of the opening stops at least 12" from the ridge brtersection (Figure 0). 20-fx 11 V211 Roll Fig. A No Ridge Board Fig. B With Ridge Board Fig. i rirl�riw wrilrir i aiM!+i«wY. WM '=sue Fig. If Copyright 0 2000 Windward Homes No portion may be copied or reproduced without the prior written permission of Windward }domes Share drive W: Quality Control Checklisu'Roofing (680)J Rooting Install Shingle Final Group 680 rev 03-16-07 , Page 3 of zom m z Windward_j Homes PLAN © 2003 WINDWARD HOMES. ALL RIGHTS RESERVED