Let Owens Corning Roofing help you calculate exactly how much ventilation you will need for a healthy and balanced attic, with our 4-step ventilation calculator.
Enter Square Footage
Calculate or enter the Square Footage of the Attic or Area to be Vented
Ventilation Requirements
Choose your requirements. *Owens Corning recommends a balanced ventilation system based on the U.S. FHA 1/150 guideline. Learn More
Based on your 1100 sq. ft. and this guideline, you'll need a minimum of:
Exhaust System Products
Allow excess heat and moisture to exit the home.
The following product options will allow you to achieve an exhaust NFVA of 528 square inches.
Select your preferred type of exhaust system:
Choose ONE of the following products to meet the recommended exhaust NFVA of 528 square inches:
VentSure® 4-Foot Strip Heat & Moisture Ridge Vent
- 27 lineal feet required. Order qty: 7 pieces.
VentSure® 4-Foot Strip Heat & Moisture Ridge Vent with Weather PROtector® Moisture Barrier
- 30 lineal feet required. Order qty: 8 pieces.
VentSure® Rigid Roll Ridge Vent
- 43 lineal feet required. Order qty: 3 rolls.
VentSure® RidgeCat® Rolled Ridge Vent
- 36 lineal feet required. Order qty: 2 rolls.
Intake System Products
Allows cool, dry air, to enter the attic.
The following product options will allow you to achieve an intake NFVA of 528 square inches.
Choose ONE of the following products to meet the recommended intake NFVA of 528 square inches:
VentSure® InFlow® Intake Vent
- 53 lineal feet required. Order qty: 14 pieces.
Undereave Intake Vent
- 14-33 pieces required. Order qty: 33 4x16" pieces | 20 6x16" pieces | 14 8x16" pieces. *These products are not offered by Owens Corning.
Soffit Vent
- 218-829 pieces required. Order qty: 218 4" pieces | 389 3" pieces | 829 2" pieces. *These products are not offered by Owens Corning.