Cor-A-Vent Product Guide

4. Center shingle cap on vent and nail. Nail line for cap shingles is to be 2" – 2 1 / 2 " up from edge. Continue nailing until all vent is covered with ridge caps. Be careful not to overdrive nail. Nail head should be flush with top of shingle, without indenting it. Pre-forming caps in cold weather helps avoid cracking. 1. Measure a 3" slot, 1 1 / 2 " each side of ridge centerline. This allows for a 2x ridge board or smaller. Snap chalk lines the entire length of the ridge. Cut slot with a circular saw and clean out debris. Set saw depth so as not to cut roof rafters. Stop the slot 12" short of any ridge end, intersecting ridge or obstruction (such as a chimney). If Architectural Shingles, Shakes or roofing with an irregular surface is used, apply a bead of caulk to roof deck before installing vent. This will seal any gaps that could allow weather penetration under the vent. 2. Nail one shingle cap at each end of the ridge, as with conventional application. Use End Plug in the exposed end on first and last sections of vent, caulk in place. Center first piece on ridge and nail, keeping end of vent 1 / 2 " from end of roof. Set 4 nails 1 / 2 " from ends and 2" up from edge on each corner of vent, add 2 nails in center of vent 2" up from edge. Repeat this step at the other end of the ridge. For V-300, use the Folded End Cap technique shown on back page. 3. Continue applying COR-A-VENT, working from ends to middle . This technique helps remove any dips or sag in the ridge. Align center with previous pieces, making sure vent matches roof pitch before nailing. Continue nailing until entire ridge is covered. Use a utility knife to cut last piece to length. Caulk where bottom edge of end caps rest on roof. *Standard applications V-300 ® or V-600 ® – 3/12 - 16/12 pitch. For steeper pitch/wide ridge beam applications see complete installation sheet or see us on the web at **Nail requirements for standard vent and ridge cap installation: V-600 - 2 1 / 2 " roofing nail, V-300 - 1 1 / 2 " (with 3 tab shingles installed on new construction or after complete roof tear off) . Important –close off exposed center openings at both ridge ends to prevent infiltration. Be sure to use fasteners** long enough to penetrate vent and roof deck when nailing the vent and ridge cap on. Heavyweight, architectural and re-roof installations require a longer nail than the standard installation. In high wind areas, use a washer headed nail to prevent shingle cap “blow off”. Or, apply a 1 / 4 " to 3 / 8 " bead of roof cement between the ridge caps, 3 / 4 " up from the bottom edge of shingles parallel to ridge. 2" Installation and Information Guide. Easy Installation: One person can easily install the handy four-foot COR-A-VENT sections. All you need is a hammer, circular saw, chalk line, utility knife, tape measure and a caulking gun. Here’s an installation overview for a standard pitch* gable roof application: COR-A-VENT Ridge Vents are sized for residential and light commercial buildings up to 60 feet wide. Please call COR-A-VENT before using our ridge vents on buildings wider than 60 feet. V-600/V-300 Series RidgeVents