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Chapin Park Local Historic District <br />Hot cold <br />Normal (Bricks expand) (Bricks contract) <br />A. Fl«Fbte Mortar <br />(Lime) <br />ON <br />Mortar compresm Mortar fleus <br />\ � .�� <br />B. Inflexible Mortis <br />(Cement) y <br />SpaBLtB Cad$ open op <br />Guidebook <br />Figure 7. Diagrammatic sketches showdneffects of temperature change upon masonry. Flexible mortar (A) nds and contracts with <br />temperature changes. Bricks bonded by in amble mortar (B) tend to spall at the edges (the area of greatest stress) m hot weather and sepa- <br />rate from the mortar when it is cold. This Iter condition opens cracks, permitting the entry of water and causing additional deterioration. <br />Adapted from Maintenance of Old Buildings. Document D20. National Swedish Institute for Buffding Research, Stockholm, 2975. <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 />Croft"Is <br />type of materials of the <br />„„rrEl <br />roof shall be retained. All <br />architectural features, <br />which give the roof its <br />EEAENNIe OMIYrED <br />0e DET`KxON"TED <br />essential character, shall <br />be retained, including <br />aarAct FAILURE <br />dormer windows, cupo- <br />las, cornices, brackets, <br />oll«AOEa.KOKEN <br />chimneys, cresting and <br />ItTENID01.1110rWNIN0 <br />ANO MOORE*emu <br />weather vanes. <br />Kt PAL0-0e <br />Page 73 <br />PLAEWNO O:KKKE r) <br />FAILURE 00 <br />SOLOEMDJ01NTt <br />NOORAWAOE <br />- VALLEYS MATE4010111000 <br />