EXHIBIT C- STANDARDS AND GUIDELINES of the HISTORIC PRESERVATION COMMISSION

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Guidebook Chapin Park Local Historic District Page 72 Figure 4: Moisture Evacuation Without and With Insulation. Prohibited Wood siding shall not be resurfaced with new material that is inappropriate or was unavailable when the building was constructed, such as artificial stone, brick veneer, asbestos or asphalt shingles. Sandblasting or the use of harsh detergents shall not be used on masonry including brick, stucco, limestone, flagstone and sandstone. This method of cleaning erodes the surface material and accel- erates deterioration. Repointing shall not be done with a mortar of high Portland cement content which can often cre- ate a bond that is stronger than the building material. Usage of Portland cement can cause dete- rioration as a result of the differing coefficient of expansion and porosity of the historic masonry unit and the mortar. This most often results in serious damage to adjacent brick. Unpainted masonry surfaces shall not be painted unless they had been painted originally. Paint shall not be removed from masonry surfaces by any means that damage the surface. b. Typical wall condition with insulation and a vapor barrier facing in (toward the heated side of the wall). The vapor barrier prevents moisture migration, thus keeping the insulation dry. a. Typical wood frame wall where moist inside air freely migrates to the outside. Moisture may condense in the wall cavity and be absorbed into the adjacent materials and evaporate as the sun heats the wall. Figure 6. Comparison of visual effect of full mor- tar joints vs. slightly recessed joints. Filling joints too full hides the actual joint thickness and changes the character of the original brickwork. Figure 5. Comparison of incorrect and correct preparation of mortar joints for repointing. Drawing: Robert C. Mack & David W. Look.