Why should decks made of nail-based insulation and OSB be replaced?

The reasoning behind the selection revolves around the vulnerabilities of nail-based insulation and oriented strand board (OSB) when it comes to moisture. OSB is known for its susceptibility to absorbing water, which can lead to swelling, warping, and ultimately deterioration of both the material itself and any structures relying on it. When moisture penetrates these materials, it can create a breeding ground for mold and mildew, further compromising the structural integrity and safety of the deck.

Replacing decks made from these materials is thus a preventive measure to avoid these moisture-related issues. It ensures the longevity and reliability of the structure. In contrast, while other options may point to issues of weight, insulation efficiency, or obsolescence, the core reason tied directly to performance and safety relates to moisture retention and its consequent effects on the materials involved.