Cor-A-Vent Product Guide

07723-5 4. Install V-300(E), Fold-A-Vent (E), V-600E on hips to provide proper ventilation. B. Ridge Vents: 1. Fit end cap onto one end of the first and last piece of ridge vent. 2. Lay a bead of calking on the underside of the end cap, press the piece and cap into position, and nail through the end cap, the ridge vent, and into the roof sheathing. 3. Use roofing nails that are long enough to penetrate ridge vent and through roof sheathing. 4. Drive the nails down flush so that the vent and end cap are held down firmly. 5. Do not indent by over driving. 6. Butt each successive piece up snugly, checking for straight alignment. 7. Use 2 nails in each end and 1 at each side at center, pulling up slightly when nailing second side to ensure that the vent is nailed at the same pitch as the roof. 8. If roof shingles are the heavy dimensional type, a bead of sealant must be applied on top of the shingles to provide weather seal between the shingles and vent. C. Cap Shingles: 1. Place the first cap shingle with approximately 1/2-inch (40 mm) overhang over the end cap and at each side of the ridge vent. 2. Nail down through the shingle, the ridge vent, and through the roof sheathing. 3. Nails must be long enough to penetrate the roof sheathing. In high wind areas, washer- head nails may be used to provide additional holding for the shingle caps. 4. Do not fasten ridge vents with staples. 5. Preform shingle caps in cold weather to avoid cracking or humping up over the ridge. 6. Apply cap shingles with 1 nail each side, up approximately 2-1/2 inches (60 mm) from the overhanging edge. 7. Drive nails flush; do not indent. ** NOTE TO SPECIFIER ** Delete the following paragraph if project does not have a steep pitch or a wide ridge beam. D. Steep Pitch and Wide Ridge Beam Applications: 1. Cut ridge vents into 2 half pieces lengthwise. 2. Nail half pieces over shingles on either side of the ridge slot. 3. Fasten metal flashing over ridge vent. 4. Cut oversize shingle ridge caps or lap 12 inch (305 mm) long shingles, and install as specified. ** NOTE TO SPECIFIER ** Delete the following paragraph if hip vents are not required. E. Hips: Install ridge vent as needed on hips to provide proper ventilation. If vent must be run down entire length of hip, do not cut slot within 3 feet (1 m) of the building line. 1. Rafters at 24 inches (610 mm) on centers: Install 8 inches (200 mm) long 2x4 (50 x 100 mm) wood blocking nailed or screwed into hip rafter between each rafter to support roof sheathing. Nail sheathing to blocking. ** NOTE TO SPECIFIER ** Allow 25 percent loss when computing ventilation at hips when blocking is used. 2. Apply a continuous bead of sealant to roof shingles immediately prior to placing hip vent to form a seal between roof shingles and bottom of hip vent. 3. Vents may be continued down hip without slot to maintain uniform appearance. ** NOTE TO SPECIFIER ** Delete the following paragraph if no clerestory or shed roofs are required. F. Roof to Wall: Install continuous Roof-2-Wall vents full length of intersections of roof with vertical walls in accordance with drawings. ** NOTE TO SPECIFIER ** Delete the following paragraph if cedar shakes are not used. G. Cedar Shakes: 1. Select shakes of uniform thickness to provide an even surface for the vent to rest on. 2. Lay a bead of sealant on top of and between edges of shakes to provide weather seal