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How to tell if wood is pressure treated?
To determine if wood is pressure treated, you can look for several indicators
Color: Pressure-treated wood often has a distinct greenish tint, though it can also appear brown, depending on the chemicals used. This tint is more uniform than natural wood grains.
Stamp Marks: Look for stamp marks or tags on the wood. Pressure-treated wood is usually marked with stamps indicating that it has been treated, along with the type of chemical used and the intended use (e.g., above ground, ground contact).
Weight: Pressure-treated wood is typically heavier than untreated wood because of the chemicals that have been infused into it.
Smell: Some types of pressure-treated wood have a noticeable chemical odor, especially when new.
Texture and Appearance: The surface of pressure-treated wood might appear slightly oily or have a slight residue, which is another indicator of the chemicals.
If you’re unsure based on these visual or tactile inspections, a more definitive approach involves purchasing a test kit designed to detect the presence of copper, which is commonly used in many wood preservatives. These kits can give a clear indication if the wood has been treated with preservative chemicals.
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References
[2] Understanding Grade Stamps. https://www.treatedwood.com/news/understanding-grade-stamps-on-lumber
[3] Pressure Treated Lumber Weights. https://www.engineeringtoolbox.com/green-kiln-dried-pressure-treated-lumber-weights-d_1860.html
