A contractor is installing pressure-treated lumber for ground contact applications in a commercial boardwalk project. The lumber is marked 'CCA' and has a retention level of 0.40 pcf (pounds per cubic foot). According to current environmental regulations and best practices, what is a key consideration regarding the use of CCA-treated lumber for this specific application?
- ACCA-treated lumber at 0.40 pcf is generally acceptable for ground contact in commercial applications.
- BCCA-treated lumber must be sealed with a special coating every year to prevent chemical leaching.
- CCCA must only be used in non-structural applications due to its reduced strength.
- DCCA-treated lumber is no longer permitted for any ground contact applications.
Show answer & explanationAnswer & explanation
Correct answer: A. CCA-treated lumber at 0.40 pcf is generally acceptable for ground contact in commercial applications.
While the use of CCA (Chromated Copper Arsenate) for residential applications, especially for decking and playground equipment, was largely phased out, it remains approved and commonly used for many commercial and industrial applications, particularly for ground contact (0.40 pcf retention) and marine applications, due to its effectiveness against decay and insects. It does not require annual sealing, and its structural strength is generally maintained.
Why the other options are wrong
- B. While sealing can help, it's not a mandatory annual requirement for CCA to prevent leaching in ground contact, and its primary protection comes from the treatment itself.
- C. CCA-treated lumber maintains its structural properties and is widely used for structural ground contact applications in commercial settings.
- D. CCA is restricted for most residential uses but is still permitted and effective for many commercial/industrial ground contact applications.
CCA-Treated Lumber (Commercial Use)
Wood treated with Chromated Copper Arsenate, a preservative providing long-term protection against decay and insects, primarily used for commercial and industrial ground-contact applications.
- Restricted for residential use since 2003.
- Still approved for many commercial, industrial, agricultural, and marine applications.
- Retention level (e.g., 0.40 pcf) indicates suitability for ground contact.
Memory trick: CCA for commercial ground contact is still grand, but for homes, it's a forbidden land.