What is the typical acclimation procedure for interior wood installations?

• A. Seal lumber in plastic to prevent moisture exchange for 7 days.
• B. Apply finish immediately after delivery to lock in moisture.
• C. Place lumber in project space at ambient conditions for 48–72 hours; verify moisture content matches manufacturer specs; avoid finishing until stable.
• D. Move lumber to a sealed dry room and dry to 0% moisture content.

Answer: (C)

Wood installations rely on the lumber reaching the same moisture level as the space where it will be installed. This equilibrium moisture content is what keeps boards stable in size and shape after they’re installed. The typical acclimation approach is to place the lumber in the project space under normal ambient conditions for about 48–72 hours, then check its moisture content to ensure it matches the manufacturer’s recommended range for that product. Only after it has stabilized should finishing be performed, so the coating isn’t compromised by ongoing moisture movement.

Sealing the lumber in plastic prevents the necessary moisture exchange, which can lead to mold growth, distortion, or unpredictable shrink/swell once the space changes in humidity. Finishing immediately after delivery locks in whatever moisture state the wood happens to be in at that moment, risking finish failure as the wood continues to adapt to its environment. Drying to 0% moisture or moving the lumber to a sealed dry room isn’t representative of interior conditions and can cause over-drying, warping, or other damage.