Deck Board Spacing Calculator
Calculate the perfect spacing between deck boards for optimal drainage, expansion, and appearance. Determine proper gaps based on board width, wood type, and climate conditions.
Step 1: Deck Specifications
Understanding Deck Board Spacing
Proper spacing allows for wood expansion, drainage, and prevents buckling. Typically 1/8″ to 1/4″ gap is recommended, depending on wood type and moisture content.
Step 2: Wood & Climate Conditions
About Wood Expansion
Wood expands and contracts with changes in moisture. Higher humidity climates require slightly larger gaps. Composite decking requires smaller gaps (1/8″) while natural wood needs more space (1/4″).
Deck Spacing Results
Recommended Gap Between Boards
Wood Type Spacing Comparison
| Wood Type | Recommended Gap | Expansion Rate | Moisture Sensitivity |
|---|
Spacing Process Breakdown
Spacing Calculation Formula
Gap = Base Gap + (Moisture Factor × Humidity Factor)
Base gap varies by wood type. Moisture factor accounts for wood’s current moisture content. Humidity factor adjusts for local climate conditions.
Need Professional Deck Design Help?
Connect with our deck construction experts for detailed plans, material selection, and custom deck designs for your outdoor space.
Get Professional Design