Laserfiche WebLink
<br />, <br /> <br /> <br />\ <br /> <br />Recommended <br /> <br />Stabilization <br /> <br />e <br /> <br />Not Recommended <br /> <br />Building: Structural Systems <br /> <br />Recognizing the special problems inherent in the <br />structural systems of historic buildings, especially <br />where there are visible signs of cracking, deflection, or <br />failure. <br /> <br />Undertaking stabilization and repair of weakened <br />structural members and systems. <br /> <br />Supplementing existing structural systems when <br />damaged or inadequate. Replace historically impor- <br />tant structural members only when necessary_ <br /> <br />Disturbing existing foundations with new excavations <br />that undermine the structural stability of the building. <br /> <br />Leaving known structural problems untreated that will <br />cause continuing deterioration and will shorten the life <br />of the structure. <br /> <br />Building: Exterior Features <br /> <br />Masonry: Adobe, brick, stone, terra cotta, concrete, stucco, and mortar <br /> <br />Retaining original masonry and mortar, whenever <br />possible, without the application of any surface <br />treatment. <br /> <br />Duplicating old mortar In composition, color, and <br />te xture. <br /> <br />Duplicating old mortar in joint size, method of <br />application, and joint profile. <br /> <br />Repairing stucco with a stucco mixture that duplicates <br />the original as closely as possible in appearance and <br />texture. <br /> <br />Applying waterproof or water repellent coatings or <br />other treatments unless required to solve a specific <br />technical problem that has been studied and <br />identified. Coatings are frequently unnecessary, <br />expensive, and do not stabilize masonry by preventing <br />further deterioration. <br /> <br />Repointing with mortar of high Portland cement <br />content, thus creating a bond that can often be <br />stronger than the building material. This can cause <br />deterioration as a result of the differing coefficient of <br />expansion and the differing porosity of the material <br />and the mortar. <br /> <br />Repointing with mortar joints of a differing size or joint <br />profile, texture, or color. <br /> <br />13 <br />