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Sub Floor Weight Capacity Calculator

Calculate subfloor weight capacity for plywood, OSB, and particleboard materials. Determine load limits, deflection, and thickness requirements for your flooring project.

How to Calculate Subfloor Weight Capacity

Proper subfloor selection ensures your flooring can support the intended loads safely. Here's how to determine the right subfloor specifications:

Step 1: Identify Load Requirements

Determine the load your subfloor must support:

  • Residential floors: 40 psf live load (bedrooms, living rooms)
  • Commercial floors: 50 psf live load (offices, retail)
  • Heavy-duty floors: 60+ psf live load (storage, equipment)
  • Add dead load for floor coverings and structure

Step 2: Select Material and Thickness

Choose subfloor material based on performance and budget:

  • Plywood: Best strength and moisture resistance
  • OSB: Good strength, more economical than plywood
  • Particleboard: Lowest cost, limited load capacity
  • Thicker panels support higher loads and longer spans

Step 3: Check Span Limitations

Verify the subfloor can span between joists:

  • Measure the distance between joist centers
  • Common joist spacing: 16" or 24" on center
  • Longer spans require thicker subfloor material
  • Consider deflection limits for comfort and durability

Cite this page as:

Daniel, P. Sub Floor Weight Capacity Calculator. Available at: https://constructioncalculators.com/sub-floor-weight-capacity-calculator/. Accessed: October 25, 2026.