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New from NPS: Using Substitute Materials in Rehabilitation
November/December 2023

Aluminum is a highly corrosion-resistant metal that is commonly used as a substitute material for cast iron. Aluminum can be a more affordable and lightweight alternative to cast iron that retains a similar texture, shape, and maintenance cycle. Courtesy NPS

Just this month, the National Park Service has issued new, more detailed guidance on the use of substitute materials in historic building rehabilitation. The new directive provides technical preservation information on when a different material than the historic one may be appropriately used to replace a deteriorated or missing historic feature, consistent with the Secretary of the Interior’s Standards for Rehabilitation. The guidance includes an expanded and updated list of building features and substitute materials that may be used as replacement materials. The NPS said webinars on the new guidance will be scheduled in the coming weeks.

Read Preservation Brief 16: The Use of Substitute Materials on Historic Building Exteriors online .

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