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Illustrated Hanbook for Historic Commercial Buildings <br />48 <br />By recognizing the <br />pattern of deterioration, <br />it’s clear that addressing <br />the source of the <br />problem should be the <br />first priority—in this <br />case, stopping water <br />infiltration. This gives us <br />a general roadmap for <br />how the intervention <br />should be approached. <br />Work should begin at the <br />top, repairing the roof <br />or windows to prevent <br />further moisture from <br />entering. After securing <br />the building from above, <br />the intervention can <br />move from the bottom <br />up: start by adding <br />temporary supports at <br />the first level, replace <br />the damaged joists <br />as needed, and then <br />repeat the process on <br />the second level. This <br />step-by-step approach <br />ensures that repairs are <br />made safely and in the <br />right order. <br />Deterioration pattern of <br />the water infiltration