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07723cav.txt
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1998-06-10
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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