ICC Commercial Building Inspector Practice Test

What is the maximum moisture content allowable for preservative treated wood in enclosed locations before it can be covered with finish materials?

1. 15%

2. 19%

3. 21%

4. 25%

The correct answer is: 19%

The maximum moisture content allowable for preservative treated wood in enclosed locations before it can be covered with finish materials is 19%. This specification is guided by the need to prevent mold, mildew, and decay, which can occur if the wood remains too moist when covered. Moisture content levels at or below 19% ensure that the wood is sufficiently dry, allowing for the effective performance of preservatives and minimizing the risk of degradation over time. If the moisture content exceeds this threshold, it can trap moisture between the wood and the finish materials, leading to problems like rot or insect infestation, which would undermine the integrity and longevity of the construction. Understanding the importance of adhering to this standard is crucial for maintaining building safety and longevity. It's also important to be aware that different projects or guidelines may dictate specific moisture levels, but for general residential or commercial applications, 19% is a commonly accepted standard.