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- SECTION 07723
-
- RIDGE AND SOFFIT VENTS
- NOTE ** Cor-A-Vent; high-density polyethylene or
- polypropylene ridge and soffit vents.
- NOTE **
- NOTE ** This section is based on products manufactured by
- Cor-A-Vent, Inc., which is located at the following
- address:
- NOTE ** P.O. Box 428
- NOTE ** Mishawaka, IN 46546-0428
- NOTE ** Attn: Technical Support Dept.
- NOTE ** Tel: (800) 837-8368
- NOTE ** Fax: (219) 258-6162
- NOTE **
- NOTE ** Continuous ridge and soffit vents provide balanced
- ventilation of attic spaces without the use of
- motors or their consumption of energy, or the
- maintenance associated with moving parts. Made of
- durable corrosion-free high-density polyethylene
- and polypropylene, Cor-A-Vent profiles are suitable
- for all common roofing materials and conditions.
- NOTE **
- NOTE ** SECTION 07723 - RIDGE AND SOFFIT VENTS, Copyright
- 1997, The Architect's Catalog, Inc.
-
-
- PART 1 GENERAL
-
- 1.1 SECTION INCLUDES
- NOTE ** Delete items below not required for project.
-
- A. Ridge vents.
-
- B. Soffit vents.
-
- C. Hip vents.
-
- 1.2 RELATED SECTIONS
- NOTE ** Delete any sections below not relevant to this
- project; add others as required.
-
- A. Section 06100 - Rough Carpentry.
-
- B. Section 07310 - Shingles.
-
- C. Section 07320 - Roof Tiles.
-
- D. Section 07410 - Metal Roof and Wall Panels.
-
- 1.3 SUBMITTALS
-
- A. Submit under provisions of Section 01300.
-
- B. Product Data: Manufacturer's catalog data, standard
- details, and installation instructions.
-
- C. Samples: 2 inch (50 mm) long samples of each profile
- required.
-
- 1.4 DELIVERY, STORAGE, AND HANDLING
-
- A. Store products indoors and protect from construction
- traffic and damage.
-
- PART 2 PRODUCTS
-
- 2.1 MANUFACTURER
-
- A. Manufacturer: Provide vents fabricated by Cor-A-Vent,
- Inc.; 2529 Lincolnway West; Mishawaka, IN 46544. ASD.
- Tel: (800) 837-8368. Fax: (800) 645-6162.
-
- B. Substitutions will not be acceptable.
-
- 2.2 MATERIALS
-
- A. Ridge Vents - General: Manufactured of corrosion-free,
- corrugated, laminated, high-density polyethylene (HDPE)
- or polypropolylene.
- NOTE ** Ventilation requirements for attics are generally
- based on the national Building Codes. They call for
- a ratio of 1:300, i.e. 1 square foot of ventilation
- for every 300 square feet of attic area, with 50
- percent of the ventilating area at the eaves and 50
- percent at the ridge. Note: Interpretation of
- these codes may vary. For exact information
- consult your local building code or building
- official.
- NOTE **
- NOTE ** In a straight gable roof application, a continuous
- V-400 or V-600 series vent with continuous strip
- vents at both soffits provides 36 square inches of
- ventilation per linear foot, which is capable of
- adequately venting an attic up to 75 feet wide at a
- ratio of 1:300. However, buildings 40 feet or
- wider may require additional soffit venting,
- depending on local code requirements. On
- installations of this size contact the Cor-A-Vent
- Technical Support Department.
- NOTE **
- NOTE ** Ridge/Soffit vent systems should not be used in
- conjunction with other roof top vents or gable end
- vents.
- NOTE ** Delete all products below that are not required.
- If more than one style of ridge vent is required,
- insert an identifying name so the contractor will
- know which type is to be used where.
-
- B. Ridge Vents: Cor-A-Vent V-400/V-600 Ridge Vent.
- 1. Net free area: 18 sq in per lin ft (38100 sq mm/m).
- 2. Color: Black.
- 3. Dimensions: 11 inches (279 mm) wide by 48 inches
- (1220 mm) long by 1 inch (25 mm) high.
-
- C. Ridge Vents: Cor-A-Vent V-600/CS Ridge Vent.
- 1. Net free area: 18 sq in per lin ft (38100 sq mm/m).
- 2. Color: Black.
- 3. Dimensions: 8-1/2 inches (216 mm) wide by 48 inches
- (1220 mm) long by 1 inch (25 mm) high.
-
- D. Ridge Vents: Cor-A-Vent V-600/T Ridge Vent.
- 1. Net free area: 18 sq in per lin ft (38100 sq mm/m).
- 2. Color: Black.
- 3. Dimensions: 3-1/2 inches (89 mm) wide by 48 inches
- (1220 mm) long by 1 inch (25 mm) high.
-
- E. Ridge Vents: Cor-A-Vent V-300 Ridge Vent.
- 1. Net free area: 12 sq in per lin ft (25400 sq mm/m).
- 2. Color: Black.
- 3. Dimensions: 11 inches (279 mm) wide by 48 inches
- (1200 mm) long by 5/8 inch (16 mm) high.
-
- F. Ridge Vents: Cor-A-Vent V-300/CS Ridge Vent.
- 1. Net free area: 12 sq in per lin ft (25400 sq mm/m).
- 2. Color: Black.
- 3. Dimensions: 8-1/2 inches (216 mm) wide by 48 inches
- (1220 mm) long by 5/8 inch (16 mm) high.
- NOTE ** Soffit vents must always be used with ridge vents
- to provide balanced attic ventilation and to
- prevent rain infiltration under severe weather
- conditions.
-
- G. Soffit Vents: Cor-A-Vent S-400 Strip Vent.
- 1. Net free area: 9 sq in per lin ft (19050 sq mm/m).
- 2. Dimensions: 1-1/2 inches (38 mm) wide by 48 inches
- (1220 mm) long by 1 inch (25 mm) high.
- NOTE ** Delete 1 of the following 2 paragraphs.
- 3. Color: Black.
- 4. Color: White.
-
- H. End Caps: Cor-A-Vent EC-400 End Cap.
- 1. Color: Black.
- 2. Material: Aluminum.
- NOTE ** The following flashings are used where imbalanced
- conditions exist to prevent rain infiltration under
- severe weather conditions. Consult Cor-A-Vent
- product literature or call Cor-A-Vent Technical
- Support Department for assistance for complex roof
- configurations.
- NOTE **
- NOTE ** Retain 1 or both of the following only when these
- conditions exist.
-
- I. Flashing: Cor-A-Vent WS-400 Solid Weathershield
- Flashing.
- 1. Color: Black.
- 2. Material: Aluminum.
-
- J. Flashing: Cor-A-Vent WS-400E Enhanced Weathershield
- Flashing.
- 1. Color: Black.
- 2. Material: Aluminum.
-
- PART 3 EXECUTION
-
- 3.1 EXAMINATION
-
- A. Verify that framing, sheathing, and shingles are secured
- and ready to receive vents.
-
- B. Verify that there is a 1 inch (25 mm) wide clear air
- space between sheathing and each side of ridge board or,
- if trusses are used, a 1-1/2 inch (40 mm) wide continuous
- clear air space centered on ridge.
-
- 3.2 INSTALLATION
-
- A. General:
- NOTE ** Vents should ordinarily be installed at each of the
- following locations. Edit as necessary to describe
- project conditions.
- 1. Install ridge vents along entire length of roof
- ridges.
- 2. Install soffit vents along entire length of soffits.
- 3. Install V-300 along entire length of intersection of
- shed roofs and vertical walls.
- NOTE ** Vents along hips are used only when the ridge vents
- would not provide adequate venting. Delete the
- following paragraph if hip vents are unnecessary.
- 4. Install hip vents on hips to provide proper
- ventilation.
-
- B. Ridge Vents:
- 1. Fit metal end cap onto one end of the first and last
- piece of ridge vent.
- 2. Lay a bead of calking on the under side 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 V-400 or V-600 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 ** 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 (300
- mm) long shingles, and install as specified.
- NOTE ** 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
- inch (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 ** 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 ** Delete the following paragraph if no clerestory or
- shed roofs are required.
-
- F. Clerestory and Shed Roofs: Install continuous vents full
- length of intersections of roof with vertical walls or
- clerestories, or at shed roofs in accordance with
- drawings.
- NOTE ** 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 between shakes and
- vent.
- 3. Install wet sheet on top of vent and cap with shakes.
- Use nails of sufficient length to penetrate
- sheathing.
- NOTE ** Delete the following paragraph if metal roofs are
- not used on the project. Contact Cor-A-Vent for
- application guide #10 for more information on metal
- roof applications.
-
- H. Metal Roofing: Install ridge and soffit vents as
- specified by manufacturer and in accordance with
- drawings.
- NOTE ** Delete the following paragraph if tile roofs are
- not used on the project. Contact Cor-A-Vent for
- application guide #9 for more information on tile
- roof applications.
-
- I. Tile Roofs: Install ridge and soffit vents as specified
- by manufacturer and in accordance with drawings.
- NOTE ** Delete the following paragraph if Weathershield
- flashing is not required by imbalanced venting
- conditions.
-
- J. Flashings: Install specified flashings where indicated
- on the drawings.
-
- 3.3 SOFFIT VENTS
-
- A. Install continuous vents full length of soffits, unless
- otherwise indicated.
-
- B. Ensure that adequate blocking or barriers are installed
- to prevent insulation from impeding air flow.
-
- 3.4 ADJUST AND CLEAN
-
- A. Remove any scrap from the site, and leave in a neat and
- clean condition.
-
- END OF SECTION
-