1. What is Deck Substructure?

Deck substructure refers to the foundational framework that supports a deck, including posts, beams, and joists. Proper calculation of post requirements is essential for structural integrity and safety of the deck.

2. How Does the Calculator Work?

The calculator uses the standard formula:

Where:

• Deck Length — Total length of the deck (feet)
• Post Spacing — Distance between posts (feet)

Explanation: This formula calculates the minimum number of posts needed to adequately support the deck structure based on standard building practices.

3. Importance of Proper Post Calculation

Details: Accurate post calculation ensures structural stability, prevents sagging or collapse, meets building code requirements, and provides long-term durability for your deck.

4. Using the Calculator

Tips: Enter deck length and desired post spacing in feet. Both values must be positive numbers. The result will show the number of posts needed, rounded up to the nearest whole number.

5. Frequently Asked Questions (FAQ)

Q1: Why add 1 to the calculation?
A: The +1 accounts for the post at the beginning of the deck in addition to those spaced along its length.

Q2: What is typical post spacing for decks?
A: Standard post spacing is typically 6-8 feet for most residential decks, but always check local building codes for specific requirements.

Q3: Should I round up the result?
A: Yes, you always need whole posts, so the calculator automatically rounds up to ensure adequate support.

Q4: Does this account for corner posts?
A: This calculation provides the minimum number of posts along one dimension. Complex deck shapes may require additional corner and support posts.

Q5: What about beam and joist calculations?
A: This calculator focuses on post requirements. Beam span, joist spacing, and other structural elements require separate calculations.