What is InterNACHI's estimation for the life expectancy of standard structural wood in a deck?

InterNACHI estimates that the life expectancy of standard structural wood in a deck ranges from 10 to 30 years due to several factors influencing durability. The longevity of wood is affected by species, maintenance, exposure to elements such as moisture and sunlight, and the quality of initial installation. Proper treatments like sealing and regular maintenance can extend the life of the wood, while neglect can lead to earlier degradation. When comparing wood types, treatments, and environmental influences, the range of 10 to 30 years reflects a realistic expectation for well-maintained structural wood decks under typical conditions. This estimate aligns with industry standards and provides a reasonable guideline for homeowners and inspectors when assessing the condition of existing structures.