Cor-A-Vent Product Guide

If the ridge length is too short to install the recommended amount of ventilation, COR-A-VENT ® V-300 ® E 11" or V-600 ® E 11" may be installed in equal lengths on the upper half of the hips. These instructions can be used for most shingle, shake or slate applications. If jack rafters are 16" on center, cut the slot per our ridge installation instructions. If jack rafters are 24" on center, blocking may be needed to prevent the roof sheathing from sagging. Cut 2" x 4" blocks 8" long, and using 16-penny nails, nail blocks between jack rafters and flush with bottom of roof sheathing. Cut the slot per our ridge installation instructions. The blocks will provide support for the roof sheathing. Nail roof sheathing to blocks with 8-penny nails. See Fig. A below. Note: When using blocking, allow for a loss of 25% in ventilation due to the blocks. The slot normally does not need to be cut more than half way down the hips for open attic roofs. The vent may be run all the way down to the end of the roof for appearance reasons, BUT DO NOT CUT A SLOT UNDER IT! This will insure that the air is drawn in from the soffit inlet vents and exhausted out through the ridge and/or hip vents. If it is an ALL cathedral ceiling roof then the slot must not be cut any closer than 3 feet up from the outside wall of the building. This will prevent any ice build up from leaking back into the building. In areas that receive heavy snowfall, the slot should stop 6 feet up from the outside wall of the house. The vent may be run all the way down to the end of the roof for appearance reasons, BUT DO NOT CUT A SLOT UNDER IT! See Fig. B below for details on how to cut the vent where the hips and ridge come together. The vent can be cut with a utility knife. Caulk all joints with black silicon caulking. Also, caulk end joints on the vent coming up the hip. If 3 in 1 shingles are used, run a 3 / 8 " bead of silicon caulking down each side of the slot, centered on the nailing surface of the vent. This will insure that the vent is sealed down across the shingle courses and prevent water from weeping in under the vent. If Heavy Weight Shingles, Shakes, Slate or Tiles are used: see Fig. C below for a detail on how to install a batten strip to provide a level surface for the vent to sit on. Batten strips need to be as thick as the thickest point of the roofing. There MUST NOT BE ANY GAPS UNDER THE VENT or water may leak in. Hip Installation Instructions End Views MINIMUM ROOF PITCH FOR INSTALLATION – 5/12 COR-A-VENT SPECIALTY APPLICATIONS S-400 STRIP VENT EAVE/SOFFIT 10 sq. in. NFVA/Lineal Foot 1" 1 1/2" PS-400 SOFFIT VENT 10 sq. in. NFVA/Lineal Foot 1" 3/4" RS-400 RAFT-A-VENT OPEN RAFTER VENT 18.7 sq. in. NFVA/22 1 / 2 " Piece 1" 1 1/2" IN-VENT 6.75" sq. in. NFVA/Lineal Foot 11" 1" 1 3/4" PURLIN VENT METAL ROOFING/SIDING 10 sq. in. NFVA/Lineal Foot 1" 3" 3" 7/16" SV-3 SIDING VENT 5 sq. in. NFVA/Lineal Foot 3" 13/16" SV-5 SIDING VENT 9 sq. in. NFVA/Lineal Foot Insect Screen COR-A-VENT RIDGE VENTS W/ENHANCED SNOW SCREEN END VIEWS TYPICAL COR-A-VENT RIDGE VENTS NON-ENHANCED END VIEWS TYPICAL 2" ABA V-600 11" 20 sq. in. NFVA/Lineal Foot 5 1/2" 5 1/2" 11" 1" 2" 1 5/8" ABA V-600 8 1/2" 20 sq. in. NFVA/Lineal Foot 4 1/4" 8 1/2" 4 1/4" 1" 1 5/8" 5/8" 3 1/2" 7" 3 1/2" ABA V-300 7" 13.5 sq. in. NFVA/Lineal Foot 2" 2" V-600T 10 sq. in. NFVA/Lineal Foot 3 1/4" 1" 2" V-300 8 1/2" 13.5 sq. in. NFVA/Lineal Foot 5/8" 1 7/8" ABA 4 1/4" 8 1/2" 4 1/4" 1 7/8" 5/8" 1 7/8" ABA V-300E 8 1/2" 13.5 sq. in. NFVA/Lineal Foot 4 1/4" 8 1/2" 4 1/4" 1 7/8" 2 1/2" 2 1/2" ABA 5/8" 5 1/2" 5 1/2" 11" V-300 11" 13.5 sq. in. NFVA/Lineal Foot 2 1/2" 5/8" 5 1/8" ROOF-2-WALL VENT 6.75 sq. in. NFVA/Lineal Foot V-600TE 10 sq. in. NFVA/Lineal Foot 2" 3 1/4" 1" * A=5/16" * B=3/16"Foil 1 5/8" ABA V-600E 8 1/2" 20 sq. in. NFVA/Lineal Foot 4 1/4" 8 1/2" 4 1/4" 1" 1 5/8" 2" ABA V-600E 11" 20 sq. in. NFVA/Lineal Foot 5 1/2" 5 1/2" 11" 1" 2" 5/8" 3 1/2" 7" 3 1/2" ABA V-300E 7" 13.5 sq. in. NFVA/Lineal Foot 2" 2" 2 1/2" 2 1/2" ABA V-300E 11" 13.5 sq. in. NFVA/Lineal Foot 5/8" 5 1/2" 5 1/2" 11"