Cedar vs. Pressure-Treated Wood: Understanding the Health Implications

The choice between natural lumber like Western Red Cedar and chemically enhanced Pressure-Treated (PT) wood involves more than just cost—it involves health. While modern lumber treatments are far safer than those used in the past, it's important to understand the components of each material.

The Chemical Factor: Pressure-Treated Wood

Historically, PT lumber relied on Chromated Copper Arsenate (CCA), which contained arsenic, a known human carcinogen. This lumber is no longer sold for residential use, but its existence is why many people are cautious.

Today's PT lumber uses chemicals like Alkaline Copper Quat (ACQ) or Copper Azole (CA). Copper acts as a powerful fungicide and insecticide, protecting the wood from decay. While safer, these are still chemical treatments:

• Handling: When cutting or sanding PT wood, always wear a mask to avoid inhaling treated sawdust, and never burn PT lumber, as the smoke releases trapped chemicals.

• Disposal: PT lumber waste must often be disposed of as hazardous waste, depending on local regulations.

The Natural Choice: Cedar Lumber

Western Red Cedar is the ultimate non-toxic option. It requires no chemical treatments because it contains naturally occurring compounds (thujaplicins) that make it inherently resistant to rot, decay, and insects.

• Safety: Cedar is safe for building raised garden beds, play structures, and any application where chemical exposure is a concern.

• Handling: Cedar dust has a pleasant, aromatic scent and, while protective gear is always recommended when cutting any wood, it poses no chemical hazard.

For a chemical-free build, cedar is the clear and natural winner.