1. What is the Deck Post Size Calculation?

The deck post size calculation determines the minimum cross-sectional area required for wooden deck posts based on the expected load and the wood's allowable stress. This ensures structural integrity and safety of the deck.

2. How Does the Calculator Work?

The calculator uses the basic stress formula:

Where:

• \( Load \) — Total weight the post must support (pounds)
• \( Allowable\ Stress \) — Maximum safe stress for the wood type (psi)
• \( Size \) — Required cross-sectional area (square inches)

Explanation: The calculation ensures the post can safely bear the applied load without exceeding the wood's stress capacity.

3. Importance of Proper Post Sizing

Details: Correct post sizing is critical for deck safety, preventing structural failure, and meeting building code requirements.

4. Using the Calculator

Tips: Enter the total load in pounds and the allowable stress for your wood type in psi. Typical allowable stresses range from 800-1500 psi for common deck woods.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical allowable stress for pressure-treated pine?
A: Pressure-treated Southern Yellow Pine typically has an allowable stress of about 1,000 psi for deck posts.

Q2: How do I determine the total load on my deck post?
A: Calculate dead load (deck weight) plus live load (people, furniture). Building codes typically require decks to support at least 50 psf live load.

Q3: Should I include a safety factor?
A: The allowable stress already includes safety factors, but consult local building codes for specific requirements.

Q4: Does post height affect size requirements?
A: Yes, taller posts may require larger sizes due to buckling considerations not accounted for in this basic calculation.

Q5: What about multiple posts sharing the load?
A: Divide total deck load by number of posts to get load per post, but ensure proper load distribution.