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Guidebook Edgewater Place Local Historic District <br />Prohibited Incorrect <br />Wood siding shall not be resurfaced with new material, Mortar not clasped out to a <br />such as artificial stone, brick veneer, asbestos or asphalt sulficiesu anilorm depth. <br />shingles, which is inappropriate or was unavailable Edges, of brick damaged by toed <br />when the building was constructed. Sandblasting or the 7, at Irtrider. Cxeatts wider Joint. <br />use of harsh detergents shall not be used on masonry or <br />stucco. This method of cleaning erodes the surface mate - <br />nal and accelerates deterioration. <br />Not Recommended correct <br />Mortar cleaned out to a un4- <br />Waterproof or water repellent coatings or surface consolida- form depth—about 1" deep. <br />tion treatments should not be used unless required to solve <br />a specific problem that has been studied and identified. Undamaged edges of brick. <br />Coatings are frequently unnecessary, expensive, and <br />can accelerate de - <br />joints <br />filledterioration of the <br />Figure 4. Comparison of incorrect and correct <br />too fun <br />masonry- Mortar preparation of mortar joints for repointing. <br />joints which do Drawing. Robert C. Mack and David W. Look. <br />edge sasceptable Wide, feather <br />to spalrmt not need repoint- <br />ing should not be. Repointing should not be done with mor- <br />tar of high Portland cement content, which can often create <br />a a bond that is stronger than the building materials. This <br />Joints <br />slightly can cause deterioration as a result of differing coefficient of <br />recessed <br />a <br />57E expansion and the differing porosity of the material and the <br />mortar, which can result in serious damage to adjacent brick. <br />Figure 6. Comparison of visual effect of tali mortar <br />Paint should not be removed from masonry surfaces indis- <br />joints vs. slightly recessed' ints. Filling joints too Crirninately- <br />full hides the actual joint Wicknessand changes the <br />character of the original brickwork. <br />Hot Cold <br />Normal (Bricks expand) (Bricks contract) <br />A. Flexible Mortar <br />ItIme) <br />11 wl� <br />O"M <br />Mortar compress" Mortar flexes <br />B. Inflexible Mortar <br />(cement) <br />spalling Cracks open up <br />Figure 3. <br />D <br />iaC <br />'d7turge5. Bricks <br />e at Old Buildings "' Document D20: National Szl�edish Institute for Building Researc}T, Storklrotm,1975. <br />Page 32 <br />a <br />