THIS IS A RE-POST OF A BLOG WE ORIGINALLY POSTED SEPTEMBER 2012:

*Updates have been made throughout this piece, including additional terms and new links for sources of those definitions.

 

PRESERVATION TERMINOLOGY: It’s one of the most common barriers between preservationists and those who do not define themselves as preservationists. It is the language we “building-huggers” use.  Below, we share a GLOSSARY of some common preservation terms and their basic definitions, as well as real-life examples.

 

The Rosetta Stone – the ultimate translator. Photo by Matteo Vistocco on Unsplash

 

Adaptive Reuse. “The conversion of a building to a use other than that for which it was originally designed, optimally, respecting the historic features of the building” (Source). This definition speaks for itself.

  • Examples: Find a discussion of benefits of adaptive reuse here, as well as a podcast about a local adaptive reuse project here.

Conservation District. Somewhat different from a Historic District, “Neighborhood Conservation districts are areas located in residential neighborhoods with a distinct physical character. Although these neighborhoods tend not to merit designation as a historic district, they warrant special land-use attention due to their distinctive character and importance as viable, contributing areas to the community at large” (Source).  These essentially focus on preserving community character vs. historic fabric. 

  • Example: Queen Village in Philadelphia is a designated neighborhood conservation district. 

Cultural Landscape. “A geographic area, including both cultural and natural resources and the wildlife or domestic animals therein, associated with a historic event, activity, or person, or exhibiting other cultural or aesthetic values” (Source). Simply, it’s a historically significant location evidencing human interaction with the physical environment. 

  • Example: Regionally, Valley Forge is a cultural landscape. 

Easement. “Legal protection (recorded in a property deed) for distinguishing features of the interior or exterior of a property or in the space surrounding a property because such features are deemed important to be preserved. For example, a new property owner may be prevented from making changes or additions to a building, structure, or landscape by an easement in the property deed itself. These are sometimes specified as preservation easements or conservation easements” (Source).  Essentially, a property owner makes a voluntary, legal, agreement to permanently protect a historic property. 

  • Examples: Our previous post includes a discussion of easements and how you can establish one. There are several benefits and incentives to easements, here

Historic(al) Context. This is “a unit created for planning purposes that groups information about historic properties based on a shared theme, specific time period and geographical area” (Source). Whether buildings, monuments, or other objects or spaces, this refers to the circumstances surrounding the item of focus during its time of historical significance or creation.

  • Examples: Historical context is a major point of focus in some of our recent articles, here and here. Current events surrounding monuments to Confederates or other people known for enslaving people also warrant discussion of historical context

Historic District. Related to, but not the same as a Neighborhood Conservation District (see above), “A geographically definable area that possess a significant concentration of buildings or sites that have been united architecturally or historically. Individual buildings in a district need not be individual historic landmarks; they can derive their significance in association with the district. A district occasionally also comprises individual elements separated geographically but thematically linked by association or history” (Source). In other words, this is an area where older buildings are considered significant or valuable for architectural or historical reasons.

  • Example: There are a number of historic districts here in Lancaster, PA.

Historic Fabric. “The physical material of a building, structure, or city that is historic” (Source). Not literally referring to fabric/textiles (although it could!), fabric in this case is just the original physical materials making up a historic structure.

  • Example: The historic fabric of a property is what makes it relevant to preservationists and lovers of history – check out our archives

Historic(al) Integrity. This is “the authenticity of a property’s historic identity, evidenced by the survival of physical characteristics that existed during the property’s historic or prehistoric period” (Source). Preservation is more than saving a building – even if a building remains standing, it may not have the same meaning if the most important parts of the historic fabric are gone, aka it loses its historic integrity.

  • Examples: There are potential consequences to lost historic integrity, as noted here. The National Park Service discusses this in greater detail here, and the National Trust for Historic Preservation discusses the importance of this aspect for seeking National Register Status, here

Historical Significance. “Having particularly important associations within the contexts of architecture, history, and culture” (Source). This may refer to a building’s or other object’s direct association with historically significant or important people, events, or information, or even something that affords historically significant information.

  • Examples: The National Register discusses more details about historical significance here.  The National Trust for Historic Preservation provides clarity and suggestions for interpreting and determining historical significance for those seeking National Register Designation here and here

National Register of Historic Places. “The comprehensive list of districts, sites, buildings, structures, and objects of national, regional, state, and local significance in American history, architecture, archaeology, engineering, and culture kept by the National Park Service under authority of the National Historic Preservation Act of 1966” (Source). It is the official list of historic places and objects deemed worthy of preservation. 

  • Examples: You can find a list of locations in Pennsylvania on the list here. The National Trust provides information on how to apply for this status, here.

Period of Significance. “The span of time in which a property attained the significance for which it meets the National Register criteria” (Source). Historical properties may witness or survive many potentially significant events, but generally one specific time or event determines the property’s significance and eligibility for the National Register.

  • Example: The Eisenhower National Historic Site in Gettysburg, PA represents a property made eligible for the National Register due to the significance of a later period in its existence; namely, only once it was purchased by President Eisenhower. 

Preservation. “Focuses on the maintenance and repair of existing historic materials and the retention of a property’s features that have achieved historic significance” (Source). Preserving something means protecting and maintaining the historic features as close to the original as possible – this is the heart of what we do!

  • Example: The National Park Service discusses preservation in detail here

Reconstruction. “Reconstruction is defined as the act or process of depicting, by means of new construction, the form, features, and detailing of a non-surviving site, landscape, building, structure, or object for the purpose of replicating its appearance at a specific period of time and in its historic location” (Source). Sometimes missing or damaged-beyond-repair aspects of a historic property need to be totally reconstructed using the same methods and materials to get as close to the original as possible.

  • Example: Pennsbury Manor outside of Philadelphia is a well-known example of a complete reconstruction.

Rehabilitation. “Rehabilitation is the process of returning a property to a state of utility, through repair or alteration, and makes possible an efficient contemporary use while preserving those portions and features of the property which are significant to its historic, architectural and cultural values” (Source). This process basically makes something useful for contemporary use or living while retaining or protecting the most important historical aspects” (Source). This is basically the same thing as adaptive reuse (see above), although, unlike adaptive reuse, rehabilitation may include projects that are more likely to use properties for the same (or similar) tasks as the original use.

  • Examples: This silk mill is still being used for production, but with a new product. 

Restoration. “Restoration is returning a site to its original form and condition as represented by a specified period of time using materials that are as similar as possible to the original ones” (Source). Closely related to Reconstruction because Restoration sometimes involves reconstruction methods, but with the added specification of restoring a property to a particular time (which may involve removing evidence of other periods). 

  • Example: Here’s a complete restoration project we were involved in.

Section 106. “The Section 106 review process is an integral component of the National Historic Preservation Act (NHPA) of 1966. Section 106 of the NHPA requires that each federal agency identify and assess the effects its actions may have on historic buildings. Under Section 106, each federal agency must consider public views and concerns about historic preservation issues when making final project decisions” (Source). This applies only to agencies affiliated with the federal government (who are proposing projects that may impact historic properties), but as a member of the public, it allows your involvement to voice concerns and ask questions. 

  • Examples: The National Park Service and the Advisory Council for Historic Preservation go into more detail here and here. More information for the layman is available here from The National Trust.

SHPO. “State Historic Preservation Officer –an official within each state appointed by the
governor to administer the state historic preservation program and carry out certain
responsibilities relating to federal undertakings within the state”
(Source). You may hear this acronym pronounced to sound like “Shippo” – it may refer to the Officer or the Office in each state for historic preservation.

  • Example: Here is a guide as to what State Historic Preservation Officers do, and here is the link to the SHPO (office) for Pennsylvania.

Standards and Guidelines. “The Standards are neither technical nor prescriptive, but are intended to promote responsible preservation practices that help protect our Nation’s irreplaceable cultural resources. For example, they cannot, in and of themselves, be used to make essential decisions about which features of the historic building should be saved and which can be changed. But once a treatment is selected, the Standards provide philosophical consistency to the work” (Source).  The standards (Preservation, Rehabilitation, Restoration, and Reconstruction) are what the Secretary of the Interior and the National Park Service recommend, to hopefully homogenize treatment of historical properties and sites nationally. The guidelines (here) provide more detailed information on execution of the standards.

  • Example: The National Trust provides more information on how to interpret these. 

 

An interesting end note:

The term “historic preservation” is unique to the U.S. and is a relatively new term – it originated in the 1960’s in response to an urban renewal planning movement that would eventually fail.  Other English-speaking countries use different terms like “architectural conservation”, “built environment conservation”, “built heritage conservation” and “immovable object conservation”. 

 

Tell us your thoughts…

What other preservation terms do you find confusing?
Are you still unsure of what the terms defined above mean?
What is the preservation term that endears itself the most to you?
How do you clarify confusing preservation terms?
What is the most commonly misunderstood preservation term you run into?
Let us know in the comments below…

Preservation and sustainability. What does one have to do with the other? If we examine these terms more closely, we can see that older buildings are inherently “green” or sustainable because of “embodied energy” (all of the energy used to build the building that would need to be expended to build something else). In fact, the report from the National Trust for Historic Preservation “The greenest building” states:

“This study finds that it takes 10 to 80 years for a new building that is 30 percent more efficient than an average-performing existing building to overcome, through efficient operations, the negative climate change impacts related to the construction process.”

This statement about life cycle analysis indicates that the construction process is resource intensive (both in production and transportation of new materials and landfill debris – about 20%-25% of landfill waste is construction-related). Reusing an existing building is the ultimate recycling, so preservation and sustainability are often inextricably linked, and this link highlights the importance and value for sustainability inherent in preservation.  


Photo by Random Institute on Unsplash

 

PRESERVATION’S LINK TO SUSTAINABILITY

Not surprisingly, both the preservation and the “green”/sustainable initiatives have significant common ground and can work in concert with one another. This is particularly relevant in light of concerns regarding climate change and major environmental concerns. The National Trust for Historic Preservation formed the Preservation Green Lab in 2009 to strengthen the connection between preservation and sustainability, and updated the name to The Research and Policy Lab in recognition of expanded needs. The National Trust for Historic Preservation has increased focus on climate change impacts on our heritage. There is also an International Climate Heritage Network to address the intersection of climate change and other environmental disasters on arts, culture, and heritage.

However, at times in the recent past, green and preservation agendas have been at odds and there has been a bias in the sustainable building field to start over with new buildings and materials, as pointed out by Tristan Roberts, and The Washington State Department of Archaeology and Historical Preservation’s (DAHP) Sustainability and Historic Preservation Executive Summary from 2011. The Whole Building Design Guide’s Historic Preservation Subcommittee (WBDG) notes that there has also been a stigma attached to preservation and it has been (often inaccurately) labeled as inefficient and requiring overwhelming or costly procedures to retrofit energy efficient systems into old systems. Additionally, Roberts reports that certain sustainable products that are made of recycled content or other sustainable materials may not be approved by the National Park Service’s Secretary of Interior’s Standards for Rehabilitation simply because they disrupt a building’s character-defining appearance. However, preservation and sustainability are far from being mutually exclusive. As Roberts reports:

“Both the environment and cultural heritage suffer when buildings are treated as disposable.”

Below, we outline characteristics of preservation that lend themselves to sustainability:

  • Energy Efficiency. As noted earlier, it also takes less energy to maintain or rehabilitate an existing building than to demolish an existing building to construct a new building, even if that new building is “green.” Restoration involves less carbon emissions than new construction. Comparatively, DAHP noted in 2011 that new buildings accounted for 40% of all extracted energy sources and 68% of all consumed energy per year. DAHP also cited the U.S. Department of Energy (DOE) who shared data indicating that “commercial buildings constructed before 1920 actually use less energy per square foot than buildings from any other decade up until 2000.” New buildings made of new materials means one must consume energy to both create and ship those materials, and this also contributes to carbon emissions. DAHP adds that many historical buildings were designed with “passive systems,” or systems that took advantage of things like natural light, ventilation, and solar orientation when electrically-powered options did not exist. These passive system characteristics are all inherently sustainable and meet the same “green” goals of the sustainability camp. You can read more of our articles on energy efficiency in our archives here

 

  • Durability and Waste. Preserving a historical building reduces consumption of materials, and retaining old material creates less construction landfill waste. Green buildings should have materials that are both durable and repairable, whether that green building is new or old. Many new green building products are durable, but not necessarily repairable (read our repair archives here). Additionally, to build a new building with new materials, you have to create and ship the resources (both of which take energy), and often they are placed on newly cleared land which takes energy but also may be removing resources such as forest or farmland. Rehabilitating an existing or historical building eliminates a lot of these issues. Even reusing durable, salvaged materials from buildings that are torn down keeps those materials out of landfills and provides green materials for another building. However, more wasteful decisions are perpetuated, as Roberts points out that the construction industry often falls prey to “short-term thinking,” focusing on what works in-the-moment and disregarding long-term outcomes. Despite these benefits of preserving or rehabilitating older buildings, there can be challenges related to durability and waste in older buildings. Roberts notes that not all older buildings were well-built with durable material or construction, so in some cases, building damage is not due to neglect or abuse, but the way the building was constructed (e.g., some buildings with structural steel that is corroded cost a lot to repair). Further, as more modern buildings age and qualify as “historic” each year, these sometimes less durably-built structures pose new challenges for both the preservation and sustainability movements.

 

“GREENING” YOUR HISTORICAL COMMUNITY, BUILDING, OR HOME

Several efforts at the international and national level have been highlighted here for increasing connections between preservation and sustainability. WBDG’s Historic Preservation Subcommittee adds several guidelines that marry LEED guidelines for “greening” existing buildings with processes that incorporate specialization for historical buildings (here). However, there are several things individuals in and building and homeowners can do as well. On a community scale, The National Trust for Historic Preservation includes information on helping preserve your community and designating a historic place. Below are tips for owners of older buildings and homes. These are based primarily on the framework provided by the National Trust for Historic Preservation’s Meghan White in “8 Ways to Green Your Historic House“, listed below, as well as information from other articles and our own expertise:

  1. Conduct an energy audit. Know where energy may be leaking. White states “A popular example is the blower door test. This test involves using a high-powered fan to take the air out of the building, which depressurizes the interior. The difference in air pressure is then measured with an air pressure gauge.” The pressure difference allows outside air to come into the building via openings, which reveals areas you’ll need to seal.  
  2. Don’t replace windows (or doors, or siding, etc.). As we’ve noted several times, a big misconception is that historical windows are to blame for the drafts in homes. White reports “As the National Trust’s Research & Policy Lab (formerly known as the Preservation Green Lab) notes in their study Saving Windows, Saving Money, historic windows rarely deserve to be completely replaced. Instead, weatherstrip them or install minimally invasive storm windows so that they keep the drafts out and lower your energy bills. The study found that retrofitting windows are the most cost-efficient way to decrease a historic house’s carbon footprint. As a bonus, old growth wood found in historic windows lasts longer than modern day wood, so preserving your historic windows will keep you from having to replace them more often.” Similar points can be made for doors, siding, and many exterior home parts that separate the outside from the inside. DAHP adds that more energy is lost from plumbing openings and uninsulated ducts than windows. The key is to repair, restore, and maintain these protections from the outside elements.
  3. Insulate the attic and basement. White notes that energy escapes through uninsulated spots such as basements, crawl spaces, and attics. Insulating them can help to prevent air from escaping. They say “Cellulose is a great option because, unlike spray foam, it’s reversible.” They also caution “You should refrain from insulating walls because you’re removing the permeable vapor barrier inherent in historic structures. The walls of historic houses are made to breathe, but inhibiting movement of air and heat through and around the wall can lead to issues like trapped moisture.” This issue is closely related to our points about differences in modern mortar and historical mortar, and the inherent breathability of old wall materials. 
  4. Take advantage of your house’s natural passive heating and cooling. White says “Artificial cooling and heating methods can be some of the highest energy consumers in a historic house.” They suggest using your historical home’s shutters to cool your house naturally: open your windows and latch the shutters to allow natural air flow. The added bonus is it will shade your interior from the sun. Window awnings that are historically appropriate can also provide similar benefits. In cases where you want or need additional electric components, consider finding a preservation and sustainability-minded HVAC professional who can retrofit systems with little disturbance to your home’s historic fabric, as we discussed here
  5. Consider installing renewable energy sources. Installing solar, wind, or geothermal renewable energy sources on your historic property are also options to consider. White says “Solar panels produce electricity naturally and will help lower your bills. When connected to a utility power grid, modern wind turbines can also help create electricity using renewable resources and in a more cost-efficient manner. Read more about installing solar panels on historic properties here.” Tesla has also developed solar panels that are extremely sympathetic to the historical aesthetics of an older home, though it may be cost-prohibitive for many.
  6. Pay attention to your landscaping. Trees may help to conserve energy in your house,with deciduous trees providing shade in the summer and fallen leaves allowing sunlight to warm your house in late fall and winter. Another issue we acknowledge is environmental damage due to combined sewer systems in many cities. When it rains too much the system becomes overwhelmed and this causes untreated sewage to be dumped into streams and rivers and contaminates waterways. The EPA fines communities every time this happens. As an individual homeowner, you can prevent some of your own contribution to this problem by: creating a rain garden to divert the water away from the storm drain and also away from the foundation; installing permeable pavers laid in the traditional manner (with sand underneath instead of mortar); and you can build a drywell. Check with your local municipality to see if they have a grant to help defray the costs of to property owners who make these changes. 
  7. Change your Lightbulbs. White points out “According to the General Services Administration, High Efficiency Incandescent (HEI) lamps reduce energy by 50 to 75% and use only 25% of the energy that regular incandescent bulbs use. They also don’t alter the appearance of historic light fixtures where the bulbs are visible, like LEDs do. Otherwise, LEDs are a good option when the bulb is obscured by opaque shades or lenses.”
  8. Reuse old materials or salvage. White encourages readers renovating historical buildings to replace missing pieces with materials from salvage companies before resorting to all-new material. This helps preserve historical pieces and prevents some landfill waste. 
     

IN SUMMARY:

Preservation and sustainability have much in common, and destroying or demolishing old buildings is more wasteful than helpful, even when replacing it with a new “green building.” It is best to preserve what we do have, by repairing, restoring, and maintaining these buildings.