Wood stain math changes completely based on structural absorption. While a standard interior wall is sealed, outdoor timber acts like a biological sponge.
Why Timber Age Shifts Your Calculations
Brand new planed timber features flattened cell structures that limit fluid volume consumption. Weathered wood, however, cracks open over time, splitting fiber networks that absorb double the volume of stain or sealer. Always account for raw wood absorption profiles before starting an outdoor project.