Yes, pressure treated wood can be used, particularly in situations where it is exposed to moisture.
Pressure treated wood is specifically designed and treated to withstand decay, rot, and insect infestations that can occur when wood is in contact with moisture sources.
Based on the reference provided:
"Use pressure treated wood in any situation where there's direct contact between the wood and anything that could supply moisture. This means posts in contact or buried underground obviously, but it also includes any lumber touching concrete or masonry since it's porous and wicks water like a sponge."
This highlights the primary purpose and recommended use cases for pressure treated lumber.
When to Use Pressure Treated Wood
Pressure treating forces chemical preservatives deep into the wood fibers, making it resistant to elements that cause degradation. You should use pressure treated wood in environments where standard lumber would quickly deteriorate.
Consider using pressure treated wood in the following scenarios, directly supported by the reference:
- Direct Ground Contact: Posts buried in the ground for fences, decks, or structural supports. This is a classic example of wood directly exposed to moisture.
- Contact with Porous Materials: Any lumber that will be in direct contact with concrete or masonry. As the reference notes, these materials are porous and can wick moisture into the wood, promoting decay. Examples include deck posts sitting on concrete footings or framing members resting on a foundation wall without a moisture barrier.
Why is Pressure Treated Wood Recommended for Moisture Contact?
Regular lumber, when exposed to consistent moisture, becomes a prime breeding ground for fungi that cause rot and decay, as well as attracting insects like termites. Pressure treatment provides a chemical barrier against these biological threats.
Think of it this way:
| Environment | Risk to Standard Wood | Recommended Wood Type |
|---|---|---|
| Dry, indoor framing | Low | Standard lumber |
| Outdoor, above ground | Moderate | Often standard lumber (with finishes) or specific treated wood |
| Moisture Contact | High (Rot, Insects) | Pressure Treated Wood |
Using pressure treated wood in these high-moisture situations significantly extends the lifespan of the structure and reduces the need for costly repairs or replacements.
In summary, if your project involves wood coming into contact with the ground, concrete, masonry, or any other consistent moisture source, using pressure treated wood is a highly recommended practice to ensure durability and longevity.
