1. What is Deck Footing Load?

The deck footing load is the total weight that a single footing of a deck must support. It's calculated by multiplying the tributary area (the area of deck supported by the footing) by the design load (the expected weight per square foot).

2. How Does the Calculator Work?

The calculator uses the simple formula:

Where:

• \( Tributary\ Area \) — Area supported by the footing (square feet)
• \( Design\ Load \) — Expected weight per square foot (pounds per square foot)

Explanation: The formula calculates the total load by multiplying the area each footing supports by the expected weight on that area.

3. Importance of Proper Load Calculation

Details: Accurate load calculation is crucial for designing safe deck footings that won't settle or fail under expected loads. Proper sizing prevents structural issues and ensures deck longevity.

4. Using the Calculator

Tips: Enter the tributary area in square feet and design load in pounds per square foot (psf). Typical design loads range from 40-60 psf for residential decks.

5. Frequently Asked Questions (FAQ)

Q1: What is a typical tributary area for deck footings?
A: This depends on deck design, but often 20-50 sq ft per footing for residential decks.

Q2: What design load should I use?
A: Residential decks typically use 40-60 psf (check local building codes). Include dead load (deck weight) and live load (people, furniture).

Q3: How does soil type affect footing design?
A: Soil bearing capacity determines required footing size. The calculated load must be divided by soil capacity to get required footing area.

Q4: Should I include snow load in my calculations?
A: In snowy regions, yes. Add snow load (typically 20-50 psf depending on location) to your design load.

Q5: How do I determine tributary area?
A: For simple rectangular decks, divide total deck area by number of footings. For complex designs, consult an engineer.