Does your attic breathe?
Colorado temperature swings are hard on roofs. This calculator tells you what your attic needs.
Length times width of your top floor ceiling. Not roof area.
Ventilation rule
Vent type
Results
- Total NFA required: 864 sq in
- Exhaust NFA required: 432 sq in
- Intake NFA required: 432 sq in
- Lomanco 750 box vents (exhaust): 9
- Standard 9 sq in soffit vents (intake): 48
Why ventilation matters in Colorado
- Ice dam prevention
- Sheathing longevity
- Energy efficiency
- Warranty compliance