Instructions / Assembly

ManualsBrandsGAF ManualsHeating, Ventilation, and Air ConditioningCobra 3 13-3/4 in. x 48 in. Roof Ridge Exhaust Vent in Black

Table Of Contents

Roof Decks: For use on minimum

(10 mm) plywood or oriented strand board (OSB)

decking as recommended by APA - The Engineered Wood Association. Wood plank decks

are also acceptable, but must be well-seasoned and supported having a maximum

(3 mm) spacing, using minimum nominal 1" (25 mm) thick lumber, a maximum 6"

(152 mm) width, having adequate nail-holding capacity and a smooth surface.

Slope Restrictions:

Use only on slopes between 3:12 and 16:12.

STEP 1

Calculations for a Balanced Ventilation System

Sq. ft. of attic ﬂoor space = Min. sq. ft. of NFVA needed

300

For ridge vent to function properly, it must be the only exhaust vent for the vented attic

space. Do not use with gable-end louvers,turbines, roof vents, or power vents.

To achieve a “balanced system” with Cobra

4' (1.21 m) plastic ridge vents, there must be

an air intake system (i.e., sofﬁts, fascia, or undereave intake vents). For proper ventilation,

the amount of intake ventilation must equal the amount of exhaust ventilation at the ridge.

NOTE: Consult local building codes for other ventilation requirements.

NOTE: In no case should the amount of exhaust ventilation exceed the amount of intake ventilation.

To determine the minimum square feet of net free ventilating area (NFVA) needed for

a balanced ventilation system, use the following formula:

Cobra

4' (1.21 m) plastic ridge vents have 18.0 square inches of NFVA per lineal foot

(38,100 mm

of NFVA per lineal meter). To determine how many feet (meters) of Cobra

4' (1.21 m) plastic ridge vent is needed, use the following formula:

2 x (min. sq. ft. of NFVA needed) x 144/18 = Min. lineal feet of plastic ridge

vent needed

To determine the amount of intake vent required, use the following formula:

X = NFVA (sq. in. per lin. ft.) of the intake vent selected

2 x (min. sq. ft. of NFVA needed) x 144/X = Min. lineal feet of

intake vents needed

STEP 2

Instruction For Slots

After calculating the total length of Cobra

4' (1.21 m) plastic ridge vent needed, determine the

necessary slot opening required.

NOTE: If installing on an existing roof, remove the cap shingles from the ridge.

Roofs without a ridge board: cut a

" (22.2 mm) opening along the ridge on each side (Figure A).

Roofs with a ridge board: cut a 1

(41.3 mm) opening along the ridge on each side (Figure B).

Note: Maximum slot opening is 3

" (83 mm) wide.

Mark off and cut the slot opening, making sure that the ends of the opening stop at least 6"

(152 mm) from any end walls and 12" (305 mm) from hip and ridge intersections or chimneys

(Figure C).

Where short ridges (dormers, ridge intersections) are used, mark and cut the slot making sure

that the end of the opening stops at least 12" (305 mm) from the ridge intersection (Figure D).

RIDGERUNNER

™

Roof Deck: Use only over a well-seasoned, supported wood deck, tightly constructed with

maximum 6" wide lumber, having adequate nail-holding capacity. Plywood decking as

recommended by The Engineered Wood Association is acceptable.

For ridge vent to function properly, it must be the only high or exhaust vent for the vented

attic space. Do not use with gable-end louvers, turbines, roof vents or power vents.

Slope Restrictions: Use only on slopes between 3/12 and 16/12.

STEP 1

Calculations for a Balanced Ventilation System

To achieve a “balanced system” with Cobra

Ridge Runner

™

ridge vent, there must be

an air intake system (i.e., soffit or undereave vents). For proper ventilation, the amount

of undereave ventilation must equal the amount of ventilation at the ridge.

NOTE: Consult local building codes for other ventilation requirements.

NOTE: In no case should the amount of exhaust ventilation exceed the amount of intake ventilation.

To determine the minimum square feet of net free ventilating area (NFVA)

needed for a balanced ventilation system, use the following formula:

Cobra

Ridge Runner

™

ridge vent has 12.5 square inches of NFVA per lineal

foot. To determine how many feet of Cobra

Ridge Runner

™

ridge vent is

needed, use the following formula:

1/2 x (Min. Sq. ft. of NFVA needed) x 144/12.5 = Min. lineal feet of ridge vent needed.

To determine the amount of undereave vent required, use the following formula:

X = NFVA (Sq. in. per. lin. ft.) of the undereave vent or intake vent system selected

1/2 x (Min. Sq. Ft. of NFVA needed) x 144/X = Min. lineal feet of undereave

vent needed.

APPLICATION INSTRUCTIONS

Exhaust Vent For Ridge Roof

STEP 2

Instruction For Slots

After calculating the total length of Cobra

Ridge Runner

™

ridge vent needed, determine

the necessary slot opening required.

Note: If installing on an existing roof, remove the cap shingles from the ridge.

Roofs without a ridge board: cut an opening along the ridge

" on each side (Figure A).

Roofs with a ridge board: cut an opening along the ridge 1

" on each side (Figure B).

Note: Maximum slot opening is 3

" wide.

Mark off and cut the slot opening, making sure that the ends of the opening stop at least

6" from any end walls and 12" from chimneys and hip intersections (Figure C).

Where short ridges (dormers, ridge intersections) are used, mark and cut the slot making

sure that the end of the opening stops at least 12" from the ridge intersection (Figure D).

”

Fig. A

Fig. B

Fig. C

Fig. D

Sq. ft. of attic floor space

Min. Sq. ft. of NFVA needed

300

20'x11

/2" Roll

”

(22.2 mm) (22.2 mm)

(44.4 mm)

(41.3 mm) (41.3 mm)

(83 mm)

(152 mm) (305 mm) (152 mm) (305 mm)

(152 mm) (152 mm)

(305 mm)

(152 mm) (152 mm)

(152 mm)

" "

Installation Instructions

™

Exhaust Vent For Roof Ridge

SNOWCOUNTRY

™

SNOWCOUNTRY

A D V A N C E D

™

SNOWCOUNTRY

A D V A N C E D

™

SNOWCOUNTRY

A D V A N C E D

™

SNOWCOUNTRY

A D V A N C E D

SNOWCOUNTRY

D V A N C E D

NOTE:

Unless used with Cobra

Hip Vent, for ridge vent to function properly, it should be the only

exhaust vent for the vented attic space. However, if the ridge vent is being used in conjunction with

a hip vent, the total exhaust NFVA should match the total intake NFVA for the vented attic space. Do

not use with gable-end or roof louvers, wind turbines, solar or powered vents, or other exhaust vents.

NOTE:

GAF recommends the use of properly installed ﬁltered ridge vents in geographic areas prone to

regular snowfall, as well as those “borderline” areas that may experience snowfall, albeit infrequently.

2 x (min. m

of NFVA needed) x 1,000,000/38,100 = Min. lineal meters

of plastic ridge vent needed

X = NFVA (mm

per lin. m) of the intake vent selected

x (min. m

of NFVA needed) x 1,000,000/X = Min. lineal

meters of intake vents needed

Summary of content (6 pages)

PAGE 1
SNOWCOUNTRY ™ Exhaust Vent For Roof Ridge 20'x111/2" Roll ® SNOWCOUNTRY RIDGERUNNER SNOWCOUNTRY ™ Exhaust Vent For Instructions Ridge Roof Installation A D V A N C E D™ ® Roof Decks: For use on minimum 3/8" (10 mm) plywood or oriented strand board (OSB) decking as recommended by APA - The Engineered Wood Association.
PAGE 2
3 STEPSTEP 3 Ridge Vent Installation Fig. E Fig. F Place, center, and conform the Cobra® 4' (1.21 m) plastic ridge Place, center and conform the Cobra® 4'rigid vent over the slot with the vent vent over the slot with the vent resting firmly against the roof ® ™ Snowand Country resting firmly against roof ® surface. For Cobra surface. For the Cobra Snow Country® Advanced Cobra®Advanced Rigid ® ™ ™ and CobraVent Rigid use Nail the™E-Z Nail system. Grasp attached 3™ Vent only, 3useonly, the E-Z system.
PAGE 3
SNOWCOUNTRY ™ Exhaust Vent For Roof Ridge 20'x111/2" Roll ® SNOWCOUNTRY RIDGERUNNER Instrucciones de instalación SNOWCOUNTRY ™ A D V A N C E D™ ® Exhaust Vent For Ridge Roof Cubiertas de techos: Para usar en cubiertas de madera contrachapada o panel de fibra orientada (OSB)A DdeV 3A /N8"C E D ™ (10 mm) de mínimo, según lo recomendado por APA - The Engineered Wood Association.
PAGE 4
3 STEPPASO 3 Instalación de respiradero de cumbrera Fig. E Fig. F Fig. G Fig. H Fig. I Fig. J Fig. K Fig. L Ridge Vent Installation Coloque, centre y ajuste el respiradero de cumbrera de plástico Cobra® ® Place, center andm) conform Cobra ventapoyado over the slot withcontra the vent 4' (1.21 sobre la the ranura con el4'rigid respiradero firmemente la ™ ® Country Advanced resting firmly against the roof surface. ® For Cobra Snow ® ® superficie del techo.
PAGE 5
SNOWCOUNTRY ™ Exhaust Vent For Roof Ridge 20'x111/2" Roll ® SNOWCOUNTRY R IDGE RUNNER SNOWCOUNTRY A D V A N C E D™ ™ Instructions pour l’installation Exhaust Vent For Ridge Roof ® Platelages de toit : À utiliser un contreplaqué ou des panneaux à copeaux orientés (OSB) au minimum A D V A N C E D™ de 10 mm (3/8 po) tel que recommandé par l’PA (Engineered Wood Association).
PAGE 6
3 STEPÉTAPE 3 Installation de l’évent de faîtière Fig. E Fig. F Fig. G Fig. H Fig. I Fig. J Fig. K Fig. L Ridge Vent Installation Placer, centrer, etfaites épouser l’évent de faîtière en plastique Cobra® de ® Place, center the Cobra 4'rigid vent over fermement the slot with thelavent 1,21and m (4conform pi) sur la fente avec la ventilation reposant contre ® ™ Snow Country resting firmly against the roof surface. For Cobra ® ® ®Advanced surface. du toit.