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9. It is inappropriate to introduce new roof features and details like skylights, dormers, or vents that compromise the original roof design, roof materials, roof elements, or character of the district or landmark. 10. It is inappropriate to use exposed tarpaper as finished roofing. It is also inappropriate to use roofing tar or asphalt (which causes further damage) on valley flashing or for patching slate, wood, or metal roofing. Foundations A building is dependent on its founda- tion for structural stability. The founda- tion also contributes to the architectural character of the building in regard to its materials, height, features, and de- tails. The form of a building foundation provides information about the date of construction. For example, stone pier foundations were used from the 1700s to the late 1870s, brick pier foundations were used between the mid-nineteenth and mid-twentieth centuries. The use of solid brick foundations with pierced brick vents was used during the last quarter of the nineteenth century and the first quarter of the twentieth century. In the 1920s, concrete block began being used for foundations and was very popular during the 1940s. Adequate ventilation under a house or building is important in maintaining a dry environment. In order to provide air circulation, vents were installed in foundations in the form of pierced brick. If a crawl space ventilation system is installed for temperature and humidity control, fol- low the manufacturers recommendations. Pier foundations were often left open, or wood lattice was installed. Later the space between piers was often infilled with masonry. The standards on the following page will ensure that alterations to historic foundations are congruous with the special character of the historic district or local landmark property. Design Standards for Foundations 1. Identify, retain, and preserve historic foundations and their form, pattern, color, texture, materials to include decorative vents, grilles, lattice, water tables, and banding. 2. Protect and maintain historic foundations and their materials, features, and details. 3. Repair historic foundations and their materials, features, and details in kind. 4. Replace deteriorated historic foundation features and materials in-kind only if it is deteriorated beyond repair. Replace in-kind, matching the original in material including masonry, mortar, joint width, profile, finishing, features, and details. The foundation of this home is brick pier with pierced brick infill.
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