Which type of wood is Penta prohibited from being applied to?

Penta, short for pentachlorophenol, is a wood preservative that is restricted in its application due to health and environmental concerns. The correct answer indicates that Penta is prohibited from being applied to logs used in log home construction. This restriction is in place because log homes are typically constructed from wood that may come into direct contact with living spaces and areas where people gather. The potential for off-gassing and direct exposure to Penta-treated wood necessitates stricter regulations in residential construction, prioritizing safety and health for occupants.

In contrast, while furniture and firewood may also raise health concerns when treated with Penta, the implications are significantly more serious for logs intended for construction, which would become integral to living environments. Wood for agricultural use may have its own regulatory stipulations, but it is not as strictly prohibited as logs in log home construction due to the latter's direct implications for human living conditions.