How does preasure treating wood keep it from rotting?

79 views

I know regular wood rots when left out in the elements, but pressure treated wood does not. Why is that?

In: Other

It’s pressurized in the presence of chemicals which permeate the wood due to the pressure. It’s similar to how vacuum sealing meat with marinade causes the flavor to get deeper into the flesh.

Pressure treated wood is basically treated by submerging it in a liquid solution that is toxic to bacteria, fungi, and bugs (it has a lot of copper, and sometimes some other things), then pressurized to shove the solution into the wood. I’ve glazed over a ton of details, but the solution shoved into the wood prevents the bugs, fungi, and bacteria that normally rot wood. That’s also why most pressure treated lumber is that weird green color.