1. What is the GAF Soffit Vent Calculation?

The GAF soffit vent calculation determines the required vent area for proper attic ventilation according to GAF roofing standards. Proper ventilation helps prevent moisture buildup and extends roof life.

2. How Does the Calculator Work?

The calculator uses the GAF ventilation formula:

Where:

• \( Attic\ Sq\ Ft \) — Total attic square footage
• \( 150 \) — The constant factor for GAF ventilation requirements

Explanation: This formula calculates the minimum required vent area in square feet for proper attic ventilation when using GAF materials.

3. Importance of Proper Attic Ventilation

Details: Proper attic ventilation prevents moisture buildup, reduces energy costs, extends roof life, and helps prevent ice dams in cold climates.

4. Using the Calculator

Tips: Enter the total attic square footage. The value must be greater than 0. The result shows the required vent area in square feet.

5. Frequently Asked Questions (FAQ)

Q1: Why is the divisor 150 in the formula?
A: GAF recommends 1 square foot of vent area for every 150 square feet of attic space for balanced ventilation.

Q2: Should this vent area be split between intake and exhaust?
A: Yes, ideally 50% should be intake (soffit) vents and 50% exhaust (ridge or roof) vents.

Q3: Does this calculation apply to all roof types?
A: This is specific to GAF roofing systems. Other manufacturers may have different requirements.

Q4: What if my attic has unusual features?
A: For attics with complex shapes, multiple levels, or other features, consult a roofing professional.

Q5: Does this replace local building codes?
A: No, always check local building codes which may have additional or different requirements.