The Rehab Guide, Volume 2: Exterior Walls - ToolBase Services

FIGURE 3 CONVENTIONAL CORRUGATED TIE PREFERED WIRE TIES■ Deteriorated masonry: A number of factors, in addition to structural distress, can contribute to the deteriorationof a masonry wall, including weathering effects of rain, UV, temperature changes, as well as theeffects of chemicals in the air or ground, inappropriate cleaning or coatings, and erosion from faulty leadersand down spouts.TECHNIQUES, MATERIALS, TOOLSREPAIR MASONRY WALL.If individual bricks or masonry units, or sections of the masonry wall, require replacement, they may beremoved relatively easily by cutting out the units to be replaced and replacing with new material. The archaction of masonry walls can often prevent adjacent sections from collapsing if the area to be removed issmall. Alternatively, in the event that the masonry ties are missing or deteriorated, a number of companiesmake stabilization systems that connect exterior brick wythes with backup walls (Fig. 4). These are eithermechanically-attached pins or ties that are drilled directly through the veneer into its substrate, or ties thatare anchored to the substrate with epoxy cements (see Product Information). Consultation with a professionalengineer is advised if the affected area of wall is significantly large, or if the brick failure is due tounderlying structural problem.ADVANTAGES: The repair or replacement of brick on low structures is relatively simple and cost-effective.DISADVANTAGES: Replaced brick and mortar will not match color of existing wall. The replacement ofbrick on high walls will require scaffolding and is costly.PLANFIGURE 4STABILIZATION TIESSECTION26