20. Policy: Sustainability
The most sustainable building is one that is already built. Sustainability and green building goals are not necessarily incompatible with historic preservation goals. Care must be taken to insure that character-defining features are preserved and that the historic rating of a structure is not compromised. With good maintenance, a historic structure, just by its longevity and the quality of construction and materials, provides an embodied energy that can never be replaced.
A. There are many ways to conserve energy in a historic building without compromising its integrity. Consider the options below:
1. Insulation in walls and roof.
2. Concealed weather stripping at doors and windows.
3. Utilize interior or exterior (when appropriate) storm windows.
4. Maintain and repair damage that allows infiltration of water or air. Special care should be taken to eliminate moisture within walls and attics.
5. Eliminate mold or dry rot by providing adequate ventilation of attics and crawl spaces.
B. Active solar hot water and photovoltaic systems can be integrated into a historic structure if done with sensitivity to the character-defining features of the building. Consider the techniques below:
1. Place collector systems on flat roofs behind parapets.
2. On sloped roofs, place collector plates flush with the roof or use collector shingles or laminated panels (metal roofs only).
3. Systems shall not be placed in highly visible locations or on primary façades.
4. Contact the Planning and Building Department regarding offsite energy mitigation.