What type of materials require protective measures when installed through wood members?

Pipes other than cast iron or steel require protective measures when installed through wood members primarily due to the potential for wood damage and safety concerns. Non-metallic pipes, such as PVC or polyethylene, can be damaged by the properties of wood over time, including moisture absorption, movement due to temperature changes, and possible deterioration from a chemical reaction if certain materials come into contact.

Installing non-metallic pipes without protective measures can lead to leaks, increased wear on the pipe, and ultimately failure, which could pose a risk of water damage to structures and other materials nearby. Additionally, using protective sleeves or fittings can help prevent any mechanical damage to the pipes during installation or while in use.

While there may be concerns about metallic materials and their interaction with wood, the specific requirement for protection when passing through wood members is particularly critical for other types of pipes due to their physical and chemical properties in relation to wood. This understanding emphasizes the importance of proper installation practices in mechanical systems to ensure longevity and safety.