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H. repairs should be performed carefully to match the original brickwork and mortar, using hand tools, not electric power saws, to remove mortar. DI repointing (fixing the mortar between the bricks) should match the original brick and mortar regarding width, depth, color, raking profile, composition, and texture. Repointing should never be done w ith Portland cement or other hard mortars unless these mortar compounds are original to the dwelling. For most pre -1920 dwellings, use soft mortars to match the original composition. If the original composition cannot be determined, use a historic compound such as one part lime and two parts sand. MASONRY: BRICK, LIMESTONE BLOCK, COBBLESTONE ,luny of Elgin's dwellings are of A. materials original to the dwelling should be preserved and brick or brick veneerconstruction. maintained. If well maintained, brick can last indefinitely. The most important should never be sandblasted or subjected to any kind of points in brick wall preservation is abrasive cleaning. Brick should never be cleaned with high to keep out water and to use an pressure water which exceeds 300 pounds per square inch. appropriate mortar mix when repair is needed. Mostpre-1920 C. should be cleaned with detergent cleansers if the brick walls dwellings in the districts have soft are stained. If you wish to remove paint from brick, the use of mortars and require similar mortar chemical removers is appropriate. This is a job that usually compounds when repointing or requires professionals. Information concerning the use of repairing. The use of hard mortars chemical paint removal products can be found in Chapter 13. like Portland cement can cause the brick to crack and break when: it D. should be cleaned only if there are major stains or paint build - can't expand and contract with the up. If the staining or dirt is limited, it may be best to leave it hot and cold weather. Portland alone. Do not introduce water or chemicals into brick walls. cement was used for dwellings after 1920 and generally this type of hard mortar will be appropriate for E. should not be coated with silicone-hacerl war P_ cP)I 1T1is. Nater dwellingsfronr thisperiod. sealants or water repellents generally have the affect of Abrasive cleaning methods such as keeping interior moisture from evaporating through the walls sandblasting or waterblasting and thereby damaging the brick. should not be used since it erodes the outerskin of the brick causing F. which has not been previously painted should not be painted water to get inside. Low pressure unless the brick and mortar is extremely mismatched from cleaning at garden hose pressure earlier repairs or patching. Previously sandblasted brick or using water or detergents is best brick in poor condition may be painted to provide a sealing for cleaning Elgin's brick coat. dwellings. G. should not be covered in stucco or other coating materials. H. repairs should be performed carefully to match the original brickwork and mortar, using hand tools, not electric power saws, to remove mortar. DI repointing (fixing the mortar between the bricks) should match the original brick and mortar regarding width, depth, color, raking profile, composition, and texture. Repointing should never be done w ith Portland cement or other hard mortars unless these mortar compounds are original to the dwelling. For most pre -1920 dwellings, use soft mortars to match the original composition. If the original composition cannot be determined, use a historic compound such as one part lime and two parts sand.