With any facade repair, trials are key to refining approaches and protocols, and to assessing the effectiveness and appearance of the work to be done. Trial repairs can provide an important opportunity to evaluate the repair process, and conduct further investigation of concealed conditions-including those that direct refinement of specific work to be performed at certain locations. In the example shown here, cracking had occurred at the terra cotta window head-jamb interface at several locations. In some cases, replacement or patching of the terra cotta unit was required. Preparation for patch installation included removal of the terra cotta at the spall location to provide a clean, rectangular repair location, and installation of stainless steel pins to anchor the patch. The process of preparing the substrate, including localized removals, and installation of patches as part of trial repairs revealed two issues that resulted in refinement of repair approaches.
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