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. . ":0 Guidebook II. EXISTING STRUCTURES A. BUILDING MATERIALS River Bend Local Historic District Original exterior wall materials in the District include brick, stucco, clapboard, wood shingles and masonry block. In some instances, vinyl or aluminum siding has been applied over the orig- inal material. Required Original exterior building materials shall be retained. Deterioration of wood materials shall be prevented through repair, cleaning and painting. The existing architectural -detail around win- dows, porches, doors and eaves should be retained or replaced by replicas of the same design and materials when deteriorated beyond repair. Masonry including brick and stucco shall be cleaned only when necessary to halt deterioration or to remove stains, and shall be done with a method acceptable for the preservation of the surface: i.e. low pressure water and soft natural bristle brushes. When repairing stucco, only appropriate stucco mixture shall be used. Recommended Whenever possible, the original building materials should be restored. metal or vinyl may be used as an alternative to maintaining or replacing the original surface material when it resembles the original surface material. When used over wood surfaces, this siding should be the same size and style as the original wood. Every effort should be made to retain the original trim around windows, doors, cornices, gables, eaves and other architectural features. Ample ventilation must be afforded the structure when aluminum or vinyl is to be installed in order to prevent increased deterioration of the structure from moisture and/or insects. Mortar joints should be repointed only when there is evidence of moisture problems or when sufficient mortar is missing to allow water to stand in the mortar joint. Existing mortar shall be duplicated in composition, color, tex- ture, joint size, method of application and joint profile. a. Typical wood frame wall where moist inside air freely 6_Typical wall condition with insulation and a vapor_ barrier_._ _ migrates to the outside. -Moisture may condence in the facing in (toward the heated side of the wall). The vapor wall cavity and be absorbed into the adjacent materials barrier prevents oisture migration, thus keeping the and evaporate as the wall is heaed by the sun. insulation dry. i INTERIOR EXTERIOR warm. main air cold. drf air 4-00d Siding moisture condensation planer Page 22 INTERIOR 1` �' EXTERIOR -arm. n'Ast air 7 ~+ !f1 cold. dry air ` *1 moisture ritr