Photo of Keperling Preservation Services’ completed work on the Harris Mansion porch in 2014, which necessitated some replacement in-kind.
As important as it is to preserve how our historical buildings actually are, inevitably replacements will need to be made when features are so deteriorated that stabilization, conservation, or restoration are simply not viable options. In these instances, the National Park Service’s Standards for Preservation and Guidelines for Preserving Historic Buildings allow for “replacement in-kind” (replicating the original feature in all respects, except improved condition) if there are surviving features that can be used as prototypes. The Standards & Guidelines also notes that, “The replacement materials need to match the old both physically and visually, i.e., wood with wood, etc. Thus… substitute materials are not appropriate in … preservation.”
Using similarly styled or patterned ceramic tile to replace a terracotta tile, using a different wood when replacing cabinetry, removing wallpaper in favor of uncovering the plaster walls, using shingles that are of a different dimension, are all changes that can easily be made in ways that are in keeping with your building’s period of significance. Yet doing so can be confusing to anyone researching historical architecture by suggesting these features (or aspects of them) were there during the building’s period of significance when, in reality, they weren’t.
Further, removing these features permanently alters your building’s historical fabric, sometimes irretrievably. Original wallpaper that is often destroyed during the removal process can’t usually be replaced with in-kind period wallpaper. Replacing one species of wood with another sometimes can’t be undone if the original species of wood is not readily available, or is priced so exorbitantly that it is not financially feasible for your project. In order to avoid significant, and sometimes irreparable, damage to your building, consider replacing only the deteriorated or missing parts of your building’s features, use materials that match the old in design, color, and texture (both physically and visually), and document the original material and the replacement process and materials used extensively for future reference and research.
- Do I have documentation of all former replacements, including documentation of the original features?
- Have I had my buildings evaluated by a qualified contractor to identify any inappropriate replacement materials or approaches?
- Do I document all replacements I do, including written and photographic documentation, noting the materials, details, and tooling on both the original and the replacement?
- Are there any parts of my building’s original features that are deteriorated or missing and need replacement?
- Is it possible to just replace the deteriorated parts instead of replacing the whole feature?
- Have I checked with a qualified contractor to see if remediation is needed for any not-in-kind replacements previously performed on my building?
Next week: PART 3 OF THIS SERIES focuses on using a good design.