1. What is Soffit Size?

Soffit size refers to the area of material needed to cover the underside of a roof overhang. It's calculated by multiplying the overhang length by the length of the roof edge.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• Overhang — The horizontal distance the roof extends beyond the exterior wall (in feet)
• Length — The linear distance along the roof edge where soffit is needed (in feet)

Explanation: This calculation gives the total square footage of soffit material required.

3. Importance of Soffit Size Calculation

Details: Accurate soffit size calculation ensures proper material ordering, prevents waste, and helps with proper ventilation planning for the roof structure.

4. Using the Calculator

Tips: Measure the overhang and length in feet. Enter both values as positive numbers. The calculator will provide the total soffit area in square feet.

5. Frequently Asked Questions (FAQ)

Q1: Should I add extra material for waste?
A: Yes, it's recommended to add 10-15% extra material to account for cutting waste and potential errors.

Q2: How do I measure the overhang?
A: Measure horizontally from the exterior wall to the outer edge of the roof at several points and use the average.

Q3: Does this calculation include fascia?
A: No, this calculates only the soffit area. Fascia is the vertical facing board and requires separate measurement.

Q4: What if my roof has different overhang lengths?
A: Calculate each section separately and sum the results for total soffit area.

Q5: How does this relate to ventilation requirements?
A: Soffit area affects ventilation capacity. Building codes typically require 1 sq.ft. of ventilation per 150-300 sq.ft. of attic space.