1. What is the Concrete Deck Footing Calculator?

The Concrete Deck Footing Calculator determines the required footing area based on the deck load and soil bearing capacity. Proper footing sizing is essential for structural stability and preventing settling.

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• \( Load \) — Total weight the footing must support (lbs)
• \( Capacity \) — Soil bearing capacity (psf)
• \( Area \) — Required footing area (square feet)

Explanation: The formula calculates the minimum area needed to distribute the deck load safely over the soil.

3. Importance of Proper Footing Calculation

Details: Correct footing sizing prevents deck settling, tilting, or structural failure. It ensures the weight is properly distributed based on soil conditions.

4. Using the Calculator

Tips: Enter the total deck load in pounds and the soil bearing capacity in pounds per square foot (psf). Typical soil capacities range from 1,500 psf (clay) to 4,000 psf (gravel).

5. Frequently Asked Questions (FAQ)

Q1: How do I determine the total deck load?
A: Include dead load (deck materials) and live load (people, furniture). A typical residential deck has about 50 psf total load.

Q2: What if my soil capacity is unknown?
A: Consult a geotechnical engineer or use conservative values (1,500 psf for clay, 2,000 psf for silt, 3,000 psf for sandy soil).

Q3: How deep should footings be?
A: Footings must extend below frost line (varies by location) to prevent frost heave, typically 12-48 inches deep.

Q4: Should I round up the calculated area?
A: Yes, always round up to the nearest standard footing size for safety.

Q5: Are there building code requirements?
A: Yes, local building codes may specify minimum footing sizes and depths - always check with your local building department.