1. What is Plywood Load Capacity?

The plywood load capacity calculation determines how much weight a plywood sheet can support based on its material properties and dimensions. This is crucial for construction and engineering applications where plywood is used as a structural element.

2. How Does the Calculator Work?

The calculator uses the plywood load capacity formula:

Where:

• \( Modulus \) — Modulus of elasticity (psi)
• \( I \) — Moment of inertia (in⁴)
• \( Span \) — Distance between supports (in)
• \( Deflection \) — Maximum allowable deflection (in)

Explanation: The equation calculates the maximum distributed load that can be applied to the plywood before exceeding the specified deflection limit.

3. Importance of Load Calculation

Details: Accurate load capacity estimation is essential for structural integrity, safety compliance, and preventing material failure in construction projects.

4. Using the Calculator

Tips: Enter all values in consistent units (psi for modulus, inches for dimensions). Typical modulus values for plywood range from 1,200,000 to 1,800,000 psi depending on grade.

5. Frequently Asked Questions (FAQ)

Q1: What's a typical modulus value for plywood?
A: For standard construction plywood, modulus values typically range from 1.2-1.8 million psi, with higher grades at the upper end.

Q2: How do I calculate moment of inertia?
A: For a rectangular section, \( I = \frac{width \times thickness^3}{12} \). Standard 3/4" plywood has I ≈ 0.088 in⁴ per inch width.

Q3: What's a reasonable deflection limit?
A: For floors, L/360 is common (span/360). For roofs, L/240. More stringent applications may require L/480.

Q4: Does this account for live vs dead loads?
A: This calculates total load capacity. Separate calculations are needed for live/dead load distribution in actual designs.

Q5: How does plywood thickness affect capacity?
A: Capacity increases with the cube of thickness (double thickness = 8x stiffness), making thickness the most critical factor.