Deck Stain Coverage and Application
The most significant factor in determining stain quantity is the **porosity of the wood**. Older, rough-cut, or pressure-treated lumber will soak up significantly more material on the first coat than new, sanded decking.
Coverage Rates (Approximate First Coat)
| Wood Condition | Approx. Coverage (Sq Ft / US Gallon) |
|---|---|
| New, Smooth Wood | 200 - 300 sq ft |
| Average / Weathered | 150 - 200 sq ft |
| Rough, Old, or Fences | 100 - 150 sq ft |
Application Tips
Coats and Consumption
While the first coat is fully absorbed, the **second coat** mostly sits on the surface, which is why it requires **less material (approx. 75%)** than the first. Always back-brush after spraying or rolling to ensure deep penetration.
Measuring Your Deck
Don't forget the **vertical surfaces**! Railings, balusters, and stair risers all contribute significantly to the total area. A common estimation is to **add 10-15%** to the floor area for a simple railing structure.
Important Warning: Oil-Based Stains
Rags soaked in oil-based stains and sealants can **spontaneously combust** (catch fire). Always dispose of them by soaking them in water and laying them flat to dry outside, or by sealing them in an airtight, metal container.