Chimney Safety Institute of America (CSIA) Certification Practice Test

What is the ideal moisture content of wood for burning?

1. 5% - 15%

2. 10% - 20%

3. 15% - 25%

4. 20% - 30%

The correct answer is: 15% - 25%

The ideal moisture content of wood for burning is a crucial factor for efficient combustion and minimal emissions. When wood is within the range of 15% to 25% moisture content, it burns more effectively and produces more heat. Wood with this moisture level allows for sufficient combustion without excessive smoke and creosote buildup, which can be hazardous in chimney systems. Wood that is too dry (below 15%) can burn very quickly and may cause increased heat output, leading to potentially unsafe situations, as well as unnecessary emissions. Conversely, wood with a moisture content above 25% will not only burn poorly, producing more smoke and less heat, but it can also lead to more significant issues such as creosote accumulation within the chimney, increasing the risk of chimney fires. Maintaining wood within the ideal moisture range ensures that it is seasoned properly and provides optimal performance when used in a fireplace or wood-burning stove. Thus, the choice indicating a moisture content of 15% to 25% aligns with best practices for safe and efficient wood burning.