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Chapin Park Local Historic District Guidebook <br />Page 73 <br />Not Recommended <br />Waterproof or water repellent coatings or surface consolidation treatments should not be used on <br />masonry surfaces unless required to solve a specific problem that has been studied and identi- <br />fied. Coatings are frequently unnecessary and expensive, and can accelerate deterioration of the <br />masonry. Mortar joints, which do not need repointing, should not be repointed. Wood siding <br />should not be power-washed. <br />B. ROOFS AND ROOFING <br />Roof shapes in the district encompass all the various designs found in residential structures: <br />hipped, gabled, gambrel, flat and combinations of these. Roofs are covered with a variety of <br />materials such as asphalt, asbestos, wood and slate shingles as well as clay tiles. Residences <br />in most cases have wood fascias with gutters and downspouts. The fascias of some vinyl- and <br />aluminum-sided houses are covered with the same materials. <br />Required <br />The existing shape and <br />type of materials of the <br />roof shall be retained. All <br />architectural features, <br />which give the roof its <br />essential character, shall <br />be retained, including <br />dormer windows, cupo- <br />las, cornices, brackets, <br />chimneys, cresting and <br />weather vanes. <br />Figure 7. Diagrammatic sketches showing effects of temperature change upon masonry. Flexible mortar (A) expands and contracts with <br />temperature changes. Bricks bonded by inflexible mortar (B) tend to spall at the edges (the area of greatest stress) in hot weather and sepa- <br />rate from the mortar when it is cold. This latter condition opens cracks, permitting the entry of water and causing additional deterioration. <br />Adapted from “Maintenance of Old Buildings.” Document D10: National Swedish Institute for Building Research, Stockholm, 1975.