1. Roof vent

• Follow steps 2 - 3b as applicable to roofing type.

2. Asphalt roofing

• Steps 2a - 2g

2a. Positioning vents

• Position vents evenly across roof, below the ridgeline so that vents can only be seen from one side of the home,

• The top of the vent should be between 1 and 2 feet below ridgeline.

• Ensure that vents are positioned so that you will not be drilling through any rafters.

2b. Pilot hole

• Drill pilot hole near the center of each vent.

2c. Outline opening

• Follow manufacture instructions to determine the size of the diameter opening.

• Mark outline of the opening.

2d. Cut hole

• From the exterior, cut out the hole for the vent.

• Take care not to cut any structural members or plumbing or electrical lines.

2e. Pry and trim shingles

• Gently pry up and break shingle tab seals around the top half of the hole

• Trim shingles to allow for the installation of roof vent flashing.

• Verify fit

2f. Install vent

• Place roofing sealant on bottom of the flashing

• Tuck the roof vents upper flashing under the two upper rows of shingles and slide into place

• leave the bottom of termination flashing on top of shingles

• Secure to roof using 4 or more roofing fasteners. Top fasteners should be installed under shingles.

2g. Seal vent

• Use sealant to adhere shingles to the top of the vent flashing and to fasten them back to the roofing.

• Cover nail heads with roof sealant.

3. Metal roofing

• Follow Steps 2a - 2c and 3a - 3c where applicable

• Wherever possible avoid adding ventilation to metal roofing.

3a. Install vent

• Lay a bead of silicone down and place malleable flashing around vent

3b. Seal termination

• Secure with screws every 1" and silicone around edge.

4. Soffit vents

• Follow Steps 4a - 4e

4a. Install baffles

• Move insulation away from soffit where soffit vent will be installed.

• Install baffles to prevent insulation from falling on top of vent and prevent wind-washing.

• Baffles should extend upward along the rafter to at least 4 inches above the finished insulation level.

4b. Outline opening

• Measure and draw opening for soffit vent.

• Opening measurements must be at least 1 inch smaller than the vent size.

4c. Cutting hole

• Cut and remove soffit on inside measurements.

4d. Apply sealant

• Apply a bead of appropriate sealant around edge of this opening you have cut.

4e. Securing vent

• Fasten soffit vent using nails or screws.

5. Gable vent:

• Follow steps 5a - 5f

5a. Identify vocation

• Follow instructions in work order and Identify where to install the vent on gable.

• Note the location of structural members, and plumbing and electrical lines.

5b. Trace hole

• Locate where to install the vent on the exterior of the home and trace outline of duct avoiding structural members and utilities.

5c. Cut hole

• Determine vent diameter and cut hole in exterior wall slightly larger, but not more than 1/4" larger, than the outer diameter of the vent shroud on the termination.

• Take care not to cut any plumbing or electrical lines.

5d. Install flashing

• Whenever possible, install flashing under cladding

5e. Install vent

• Position vent termination flush against exterior. Orient to allow damper(s) to close when not in use.

• Secure to house using 4 or more exterior grade fasteners

5f. Seal termination

• Seal gap between termination and exterior of home with exterior grade caulk to prevent water intrusion.

Notice: Screen

• Vents must have screens, with 1/4 to 1/16 inch opening.

• This is to help prevent pests, snow and rain entering through the vents.

• Vertical vents must have louvers to deflect rain.

Attic Ventilation Standard

• Adjustments to attic ventilation shall meet the current requirements of the IRC.

• The IRC requires that the minimum net free ventilating area shall be 1/150 of the area of the vented space.

• EXCEPTION: If you have equal parts high and low ventilation area shall be 1/300 of the vented space.

• Attic vent types will be made of corrosion-resistant material for their specific locations.

• Powered attic ventilator will not be used.